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The post examples, verifications, and white noise tests are re-generated periodically via a GitHub Action with the most up-to-date OpenSees source code. As OpenSees evolves, so may the results shown on this site.
To search this site using Google, e.g., for "Concrete23", use the following query:
site:openseesdigital.com Concrete23Posts
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Two EIs, One Axis
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Insert Assertion Here
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Pathological Convergence
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Thermal Loads on an Elastic Beam
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More Field Guide than Textbook
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You Have to Make the Analysis Fail
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Best Solver for an SDF Analysis
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All Possible Sets of Possible Redundants
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More Than One Way to Heat Up a Truss
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Inside the Equation Numbers
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Stop Cargo Culting BandGeneral and Plain Numberer
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Remote Control
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Leaning Column
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Why Your Eigenvalue Analysis Failed
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Partial-Span Uniform Loads
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Empty Spaces
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Reverse Engineering the Equation Numberer
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2025 In Review
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Eigen Almost Hear You Sigh
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Modeling Is Always Nonlinear, but Not the Response
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Three Acts with the Two Node Link
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Combined Loadings
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The Hibbeler Books Really Are Good
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Concrete23andMe
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Ways to Analyze This
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Making Sound Waves
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Evergreen OpenSees Content
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Daisy Chains and Gaffes
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OpenSees Malapropisms
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Positive OpenSees Contact
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The Three-Act Verification
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Analyze This
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Minimal Random Process Example
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Rotated Local Axes
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OpenSees Pirate Jokes
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Celestial OpenSeesing
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Double Inverted Pendulum
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Scribbled Lines
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How to Use pytest with OpenSees
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Hold on Loosely
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Distributed Moments
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A Model of Inconsistency
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Bring Your Own Matrix
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Can't Truss It
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How to Apply Surface Loads
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Counting Flops
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Choose Your Own Topology
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The Emperors of OpenSees
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My Big Fat Sparse Solver
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Buckling of Restrained Plates
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Minimal Plate Buckling Example
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The Mechanically Separated Wall
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Egg-Centric OpenSees Jokes
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Statically Equivalent Loads
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Running Examples
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Apples and Oranges
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Textbook Units
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Section Warping Analysis
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OpenSees Blogs Well
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OpenSees Coming and Going
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One Is All You Need
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Two Node Link's Awakening
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Textbooks and Hand Grenades
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Damping Is a Sensitive Subject
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Which Noun Are You Modifying?
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One Fiber at a Time
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Minimal Damper Example
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J2 Plasticity Parameters
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2024 In Review
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How to Profile an OpenSeesPy Analysis
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Invertible Does Not Mean Stable
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Beyond OpenSees
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Structural Analysis Is Simple
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See You in December
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A Simple Base-Isolated Model
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Getting the Number of Nodal DOFs
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Long Term Column Loading
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OpenSees Tom Swifties
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The Maximal Broken Example
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Dangling Recorders
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No Reaction
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The Old Code OpenSees
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Sequential Ground Motions
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Getting the Digits
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Critical Buckling Loads via CBDI
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OpenSeesing as if Readers Matter
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The Good, the Not So Bad, and the Full General
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Hydrostatic Loading on a Wall
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OpenSees Mandela Effect
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Corotational Rigid Offsets
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A Return to FORM
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The Sound of "OpenSees"
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Plate Rebar Material
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Show Me Don't Tell Me
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OpenSees Retractions
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Is It Close Enough?
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A Load at a Fixed DOF
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Sloshing Around
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OpenSees Every Day
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Torsional Buckling
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A Post from ChatGPT
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Set and Get Concrete23 Response
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All About Making that ZPA
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Valid Range of OpenSees Tags
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Multi-Linear Parallel
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Murum, cura te ipsum
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Secant Accelerated Newton Algorithm
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Just Fillin' Up the Tank
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Static Analysis with Uniform Excitation
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Monte Carlo Simulation with OpenSeesMP
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Minimal MVLEM Example
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The OpenSees WCEE Bump
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The Toy Reliability Problem
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Earthquake Engineering Experts Hate Me for This One Weird Trick
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Effective Earthquake Forces
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OpenSees Bean Counting
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Wrapper's Delight
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Is OpenSees Pythonic?
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Material Testing with White Noise
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OpenSees Command Line Arguments
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It Hides in Plain Sight
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Spreader Beam Analysis
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Faux Contact Sport
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Two Sprung Masses and Some Friction Force
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Centripetal Acceleration
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Minimal Thermal Example
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Projectile OpenSeesing
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How to Use with with OpenSeesPy
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No Element Required
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The Hard Dynamics
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2023 In Review
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A Better Way to Find a Memory Leak in OpenSees
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Good Scotch
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Edit Your Copy
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Eccentrically Loaded Bolt Groups with Bolt Hole Clearance
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Beam With Hinges Interior Redux
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What Is a Good Penalty Number?
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The Sensitivity Is in the Details
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Making a Point Load
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How to Apply Ground Motions in Multiple Directions
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Will OpenSees Ever Be Un-Seen?
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Rectangular Hollow Structural Sections
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Cheesy OpenSees Jokes
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It Takes Two
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Losing Displacement Control
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Could Not Invert Element Flexibility
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An Ode to Concrete23
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One and Only One
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Section Integration
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Life of OpenSees Pi
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How to Mesh Shells
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Distributed Mass Beam Vibration
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It's OK to Be Negative
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Flipping Rotation Axes
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Tuned Damper Models
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Right, then Left
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Handling a Doubt
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Pleasing the Compiler
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Constraint Matrix Not Identity
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The PFEM in OpenSees
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Do It Your Self-Weight
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Make Every Word Count
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Something Like a Double Negative
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You Never Forget
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How to Apply a Pulse Ground Motion
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Will Write for OpenSees
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Beware the Em Dash
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Minimal DDM Examples
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Converging to Something
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Minimal GimmeMCK Example
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Silence Is Golden
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Gotta Catch 'Em All
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The Three Node Quad
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Hidden Fees
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Transformation Cross-Training
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Minimal Plotting Example
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Cargo Cult OpenSeesing
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Concrete Zero
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What Does It Refer To?
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Runnin' Down a Leak
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Minimal Creep and Shrinkage Example
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How to Keep Your OpenSees Code Private on GitHub
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Abstract Frenzy
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Arc Length Parameters
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Run OpenSees in the Cloud
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A Rigid Bar Walks Into a Bar
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My Favorite Ternary Operation
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How to Bend Beams in 3D
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Pity the Reader
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Shutting Off the Containment Unit
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Not Everything Should Be a Direct Translation
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Pruning OpenSees
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Modal and Stiffness Proportional Damping
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Eigenvalues of the Stiffness Matrix
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How to Use Block2D
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Two Thousand Concrete23!
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Eccentrically Loaded Bolt Groups
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On OpenSeesing Well
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More Ado About Damping
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Sometimes Tags Don't Matter
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OpenSees Smarter, Not Harder
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A Simple Material Tester
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Multi-Threaded SDF Analysis
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Bad OpenSees Turkey Jokes
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I Missed Again
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Writing that Shines
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How to Profile OpenSees
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Blogged Higher and Deeper
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Top 5 Posts
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Don't Invert the Matrix
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Single Quotes or Double?
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Stop Hogging All the RAM
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Geometric Transformation
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Don't Delete This Bot
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Verbing OpenSees
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Publish Your Age
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Another Way to Get Bad Eigenvalues
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One Way to Get Bad Eigenvalues
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How to Find the Neutral Axis
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Quick (and Dirty) Modal Damping
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Pseudo-Time Is Not the Load Factor
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Misalignment with OpenSees
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Rigid Diaphragm for 2D Models
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Simple Loads on a Cantilever
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OpenSees Pareto Principles
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Element Self-Weight
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CyclopSees
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A Lovely Little Mystery
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Force-Based Element Moment Release
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Chekhov's Gun
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OpenSeesPy List Comprehensions
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OpenSees to JSON
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The Basic Natural Kernel in a Corotating Frame of Reference
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Unrolling the Four Node Quad
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Un-Matlab Your OpenSees
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El viejo y los mares abiertos
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An OpenSeesSPecial Request
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Parametric Oscillator
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Main Street, OpenSees
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A Nod to Backward Compatibility
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Nonlinear Sections, Elastic Elements
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Negative Feedback Loop
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Shear Verse, Same as the First
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Elastic Shear Beams in OpenSees
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OpenSees 12345
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A Simple Solution to a Complicated Equivalent
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Full Fiber Circle
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P-M Interaction by the Book
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Get the Accel Out
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Rectangular Patches
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How to Find a Memory Leak in OpenSees
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A Solution, Just Not The Solution
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Plane Sections Do Remain Plane
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Switching Sides
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A Complicated Equivalent
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Fuzzy Zero Length Logic
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Hysteretic Damage Parameters
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How to Record Section Curvature
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Gimme All Your Modal Damping
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Non-Convergence Is Not Structural Collapse
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OpenSees Spy
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More Than You or Eigen Chew
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Something, Something, Something Fiber
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OpenSees Scattergories
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Two Fibers Explain So Much
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Much Ado About Damping
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Major League
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See the Convergence
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Two Fibers Five Ways
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Verifying Will Never Be Easy
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The Stiffness Matrix Isn't Everything
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Start Over Again
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More Solutions Than Problems
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OpenSees Tcl to Python Converter
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Three-Dimensional Meshing
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Glulam Volume Factor
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Two Paths You Can Go By
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NaBloPoMo Recap
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Line Mesh
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Two-Dimensional Meshing
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Work on Your Cliches
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Finite Differences
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Full Credit
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Happy Franksgiving
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Tips for Squandering OpenSees
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Earthquake Songs
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Cable Analysis
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Make a Pull Request
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Initial Conditions
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Monte Carlo Simulation
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Means and Ends
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Five Tweets from the Bot
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Repeated Section Modes
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Trying to Get a Reaction
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RBOC: Influence Lines
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Inerters Everywhere
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OpenSeesaw
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Your DLL Might Be Ignored
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You Get What You Give
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Eigenvalues During an Analysis
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One Citation at a Time
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Section X
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Concrete02 with Control of the Initial Stiffness
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You Didn't Build That
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Slender Things
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OpenSeesBf
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Interpolation of Ground Acceleration
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Don't Think, Just Throw
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The Little IDA
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Not All at Once
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No Exit
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Non-Prismatic Frame Elements
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Failed to Get Compatible ...
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Every OpenSees Tutorial
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Direct Moment-Curvature
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Like Spinning Nodes
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Failure to Solve
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A Blog in Motion
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Non-Fungible OpenSees
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RBOC for the Fall
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Multiple-Support Excitation
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Making Sense Out of Concrete02
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Parameter Updates in the Loop
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Nobody Wants to Read Your Shit
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That's a Large Mass
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Building Blocks
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How to Record Fiber Response
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Polymorphic Pitfall
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Off the Hooke
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Verifying Ain't Easy
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Absolutely, It's Relative
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You Gotta Keep 'em Aggregated
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Minimal Working Example
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It's a Fine Line
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Tcl as a Front End for Python
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There's Three, Actually
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Random Bullets on Blogging
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The Rayleigh Quotient
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Discretized Members Only
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Go Cite Yourself
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Right Under Your Nose
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Going Through Stages
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Backlink Hijinks
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Elastoplastic Calibration
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Striking YouTube Gold
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No Framework for Old Men
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Reaction and Unbalance
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Trapezoidal Beam Loads
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Release the Plastic Hinge
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Syllabus by Blogging
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Heavy as a Chebyshev
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How to Cite a Blog Post
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Its Power and Its Problem
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OpenSees Is Simple
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Stress Resultant Verification
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Did You Pass Your Patch Test?
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Wind in Warped Sails
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Wipe Out!
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Plastic Rotation
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Stability Challenge Results
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Norms and Tolerance
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Don't Try This at Home
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How Many Clicks Does It Take?
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It's Not Load Control
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A Very Stable Challenge
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Fiber Section Centroids
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Nonlinear Elements, Elastic Sections
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Load Patterns and Time Series
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OpenSees Blog Delurking Week
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Sensitivity Training
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Hysteretic Pinching Parameters
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Every Ending Is a New Beginning
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When a Deal Breaker Is Not a Deal Breaker
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Uniaxial Multi-Tool
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OpenSees Fire v2.0
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A Little Secret About OpenSees Tcl
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The Linear Algorithm Strikes Again
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Make Room for Storage
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OpenSees Thanksgiving
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OpenSees Facebook Group
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Compiling OpenSees
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Reduce Your Bandwidth
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Moving and Influential
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Twitter Bot 200
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Mass and Weight
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Rigid Joint Offsets
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Fibers of Higher Dimensions
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You Know You'll Have to Write About It
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Brace Your Tcl Code
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OpenSees Documentation
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Last Committed Stiffness
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Ordinary Eigenvalues
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The Prevalence of OpenSees in JSE
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PSA: OpenSees Commands Are Case Sensitive
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A Quad Out West
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Don't Forget to Take a Selfie
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Rayleigh Damping Coefficients
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Early Landscape of OpenSees
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Variations on Modified Newton
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Pushover with Constant Ground Jerk
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OpenSeesPy Is Not Terrible for the Environment
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How to Bend Beams
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Force-Based Beam-Column Integration Options
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Modal Participation Factors
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NaBloPoMo 2020 - OpenSees Edition
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The Basics of Frame Element Localization
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Glenn Holcomb, The Prof.
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Closing the Loop on Direct Assembly
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How to Run an OpenSees Container in the Cloud
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Global Distributed Loads
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Thoughts After a Year of Blogging
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SSI Modeling Challenge Results
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Most Solvers Can Be Marplots
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A Marathon, Not a Sprint
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Recorders not Recording?
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A Vector in the x-z Plane
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One Iteration of a Second Order Analysis
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Discarded Wrappers
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SSI Modeling Challenge
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There's a Wrapper for That
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Integration Points with Negative Weight
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Where is Eastchester?
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Results of a New Challenge
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Not Just a Modeling Term
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Handle Your Constraints with Care
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Gimme All Your Damping, All Your Mass and Stiffness Too
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Meshing for Column Loads
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A New Challenge
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More Is Not Always Better
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Semi-Blind Kind of Contest Results
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Close to the Edge
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Better Late than Never
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A Semi-Blind Kind of Contest
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A Tale of Two Element Formulations
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With or Without You
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Better Than Ideal Conditions
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Abstract Thoughts
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Start with the Correct Static Resisting Force
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Incompetence, Not Malice
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Recognizable Dates as Self-Imposed Deadlines
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Blog Delurking Week
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The Fiber Content of OpenSees
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OpenSees Twitter Bot
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OpenSees Shells by the Seashore
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Unretiring the String Class
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An Update of the IMK Models
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Algorithmic Limerick
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Thankful for OpenSees
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Just Another Python Module
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OpenSees Time Machine
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Only Their Mother Can Tell Them Apart
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OpenSees Source Control: From Zip to Git
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Gaming ResearchGate
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Non-Convergence Does Not Mean OpenSees Crashed
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One More OpenSees Analysis
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Behind the Elastic Interior
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Torsion with Fiber Sections
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Be More Specific than "Fiber Element"
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Is Plastic Hinge Integration a Fruit or a Vegetable?
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How to Cite OpenSees
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No CAPS When You Spell the Framework's Name
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Be Careful with Modal Damping
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Coming Soon
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