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Building a Local Coordinate Transformation Matrix in 3D Using MATLAB
by alpsdev When working with 3D structural elements such as beams, frames, or trusses, it is often necessary to define a local coordinate...
Adisorn O.
Apr 282 min read


🏗️ Why You Should Always Include the Basement in Seismic Modeling
When it comes to seismic analysis of buildings, one question often gets overlooked: “Should I include the basement in my seismic model?”...
Adisorn O.
Apr 194 min read


Mass Participation Factor: Physical Meaning and Derivation
(please see attached file for matlab example)
Adisorn O.
Apr 161 min read


The Trade-off in Seismic Periods
Short-period buildings (Low rises) are typically subjected to higher base shear but smaller displacement and very low risk of the P-Delta...
Adisorn O.
Apr 161 min read


Understanding Seismic Period Limits in ASCE 7: Empirical vs. Analytical Periods
In seismic design, one of the most commonly misunderstood topics is the fundamental period of a building and how it affects base shear...
Adisorn O.
Apr 162 min read
Modal Analysis -- Ritz vs Eigen?
Eigen : "You're searching the entire modal domain , including irrelevant modes — torsion, out-of-plane wiggles, garbage local...
Adisorn O.
Apr 123 min read


Suppressing Vibrations in a 2DOF Mass-Spring System Using a Tuned Mass Damper: Part 1 -- Introduction
Adisorn Owatsiriwong, D.Eng. **Introduction** In many engineering applications, mechanical systems are subjected to dynamic loads that...
Adisorn O.
Aug 9, 20242 min read


Approximated Dynamic Analysis using Ritz's Vectors
(Preview page) Cite As: Adisorn Owatsiriwong (2024). Approximated Dynamic Analysis using Ritz's Vectors(https://www.mathworks.com/matlabc...
Adisorn O.
Mar 10, 20241 min read


Reduction of Dynamic Matrices using Static Condensation
(Preview page) Cite As Adisorn Owatsiriwong (2024). Reduction of Dynamic Matrices using Static Condensation(https://www.mathworks.com/mat...
Adisorn O.
Mar 9, 20241 min read


Adisorn O.
Mar 9, 20241 min read


Response to General Dynamic Loadings: Duhamel's Integral
Preview page (A complete paper is attached for download)
Adisorn O.
Mar 6, 20241 min read




WIND AND SEISMIC LOADS WITH ETABS USING STATIC APPROACH
A workshop presented by Dr. Amnart Khampanit to undergrad students on wind and seismic loads calculation using ETABS. The presentation...
Adisorn O.
Mar 30, 20231 min read
Steps to Seismic Design using Structural Dynamics
This presentation introduces steps to perform seismic design using structural dynamics. The design procedure follows ASCE 7, emphasizing...
Adisorn O.
Mar 26, 20231 min read
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