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3D Frame Transformation with Section Roll Example (Simplified)
This document explains the step-by-step procedure to compute the transformation matrix for a 3D frame element that includes a section...
Adisorn O.
Jun 7, 20252 min read


STM Example: Reinforced Concrete Corbel
Here we show the real example of reinforced concrete corbel to carry a total load of 900 kN, i.e. 4 points of 225 kN. The STM model is...
Adisorn O.
Jun 2, 20252 min read


Strut and Tie Modeling in Reinforced Concrete Structures--Basic and Applications
reference: (PDF) Strut-and-Tie-Modeling in Reinforced Concrete Structures Basics and Applications
Adisorn O.
Jun 2, 20251 min read


Understanding Plastic Collapse: Lower Bound vs. Upper Bound Theorems
1. Introduction Plastic analysis provides a powerful tool for estimating the collapse load of structures by using either the lower bound...
Adisorn O.
Jun 1, 20252 min read
Flexural Design of Beam with Compression Rebar : ACI 318-19
% Beam parameters fc = 30; % MPa fy = 500; % MPa Es = 200000; % MPa b = 300; % mm d = 550; % mm dp = 50; % mm Mu = 400e6; % N.mm phi =...
Adisorn O.
May 24, 20252 min read


Why and When to Use Two-Stage Seismic Analysis in Tall Building Design
In modern seismic design, especially for tall buildings with podiums, engineers often face a fundamental modeling dilemma: Should we...
Adisorn O.
May 17, 20253 min read


What Universities Don't Teach: The Art of Structural Engineering Judgment
In the world of structural engineering, everyone learns the code. Everyone models the structure. Everyone checks PMM ratios, rebar...
Adisorn O.
May 17, 20252 min read


Design of Gravity Frame (Non-Participating Frame) : Summarized from Prof. Moehle's Book
Background Based on the excerpts from "Seismic Design of Reinforced Concrete Buildings" by Jack Moehle, we can certainly discuss gravity...
Adisorn O.
May 15, 20256 min read


What is Behind ETABS's Simplified C- T- Shear wall Design
Ref. ETABS's SWD ACI318-99 Manual Based on the Shear Wall Design Manual (ACI 318-19) , the Simplified C- and T-section shear wall design...
Adisorn O.
May 14, 20253 min read


Adisorn O.
May 14, 20250 min read




Why 'Geometric Stiffness' Is a Misnomer
In the field of nonlinear structural analysis, the term 'geometric stiffness' has long been used to describe the additional terms that...
Adisorn O.
May 12, 20252 min read


Geometric Nonlinear Truss using Updated Lagrangian (UL) – MATLAB Implementation
Inclined 2-Bar Truss with Geometric Nonlinearity and Transformation Matrix This example models a 2-bar inclined truss using the Updated...
Adisorn O.
May 12, 20254 min read


Phase 1 Workbook: Nonlinear Truss Element using Newton-Raphson (with MATLAB)
This workbook builds a nonlinear axial truss model using the Newton-Raphson method and a bilinear elastic-plastic material model. It...
Adisorn O.
May 12, 20252 min read


Two-Stage Seismic Analysis for Tall Buildings with Podium or Basement
In the seismic design of tall buildings with podiums or basements, the structure typically consists of a flexible tower built over a...
Adisorn O.
May 12, 20253 min read


Topographic Factor (Ct) in NBCC 2015/2020
In the National Building Code of Canada (NBCC) 2015 and 2020, the topographic factor (denoted as Ct) adjusts wind pressure to account for...
Adisorn O.
May 12, 20252 min read


Comparison of Wind Load Design: ASCE 7-16 vs NBCC 2015/2020
Wind load design is a critical aspect of structural engineering, especially for buildings in urban environments where wind effects can...
Adisorn O.
May 12, 20253 min read


The Core Philosophy of ASCE 7 Seismic Design – A Capacity Design Perspective
Seismic design in ASCE 7 is fundamentally governed by the principles of capacity design. This approach ensures that structural systems...
Adisorn O.
May 11, 20252 min read


Do You Need to Multiply Vu by 3.0 for Pile Cap Design under Special Shear Wall?
Source: https://www.linkedin.com/posts/ahmed-abbass-m-sc-ph-d-663151145_learn-about-typical-failure-mechanisms-in-activity-72702927417948...
Adisorn O.
May 11, 20252 min read


Overstrength Factor (Ωo) : Which part of structure to apply?
In seismic design, the overstrength factor (Ωo) is a crucial component used to ensure a desired hierarchy of strength and failure...
Adisorn O.
May 11, 20255 min read
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