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Key Considerations of Seismic Design: Stiffness, Strength, and Ductility
In the world of structural engineering, seismic design is not just about withstanding earthquakes — it’s about ensuring resilience,...
Adisorn O.
4 hours ago3 min read
4 views

🔄 Rotated Neutral Axis: A Smarter Way to Generate the PMM Surface
When checking seismic design for shear walls, engineers often rely on pre-defined PMM interaction curves. But with today’s tools, we can...
Adisorn O.
16 hours ago1 min read
3 views

🏗️ Understanding P–Delta Effects in ASCE 7-16 Seismic Design
In structural engineering, understanding the role of second-order effects, particularly P-Delta (∆) moments, is crucial for designing...
Adisorn O.
22 hours ago2 min read
7 views

🏗️ 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.
3 days ago4 min read
4 views

WALLCHECK—A Seismic design safety tool for shear wall buildings
In development plan to be completed in Q2/2025
Adisorn O.
3 days ago1 min read
2 views

Redundancy Factor in ASCE 7: When One Wall Is Not Enough
In seismic design, we focus heavily on member strength and ductile detailing — but often overlook the quiet power of redundancy . ASCE 7...
Adisorn O.
3 days ago2 min read
11 views

Understanding the Overstrength Factor (Ω₀): Why Some Elements Must Stay Elastic Even When the Building Yields
In seismic design, much attention is given to ductility, energy dissipation, and the Response Modification Factor (R) — which allows us...
Adisorn O.
3 days ago3 min read
14 views

Understanding Structural Irregularities in ASCE 7: A Guide to Remedial Actions
In modern structural design, achieving both safety and efficiency requires more than just calculating forces and designing members—it...
Adisorn O.
4 days ago3 min read
5 views

Comparison of Post-Installed Anchor Types (ACI 318)
1. Overview This summary compares different types of post-installed concrete anchors, including adhesive, expansion, undercut, and...
Adisorn O.
5 days ago2 min read
5 views

Concrete Fastener Design Summary (ACI 318-19) -- revised
Adisorn Owatsiriwong, D.Eng. alpsdev Introduction Concrete fasteners (anchors) are used to transfer loads between structural and...
Adisorn O.
5 days ago3 min read
21 views

Settlement Calculation of Footing on Sand Layers
Credit: uproperty.ph.com *Use this sheet at your own risk!
Adisorn O.
5 days ago1 min read
6 views
Summary of Load Combinations for DPT1302-61 and DPT1301-50
Thailand's DPT 1301-50 (Standard for wind load calculation) and DPT 1302-61 (Standard for Seismic Design) are currently adopted for...
Adisorn O.
6 days ago1 min read
4 views

Mass Participation Factor: Physical Meaning and Derivation
(please see attached file for matlab example)
Adisorn O.
6 days ago1 min read
2 views

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.
6 days ago1 min read
7 views

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.
6 days ago2 min read
12 views
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
4 views

🚀 Introducing GravCol – A Smarter Way to Understand P-Delta Effects
As post-tensioned and high-rise concrete designs grow more complex, structural misbehavior caused by gravity-only (leaning) columns...
Adisorn O.
Apr 62 min read
5 views
When to use the 'allocatable' keyword when declaring dynamic arrays in Fortran
It can confuse when to use allocatable keyword when declaring dynamic arrays. We have two scenarios to declare the array here First...
Adisorn O.
Mar 261 min read
4 views

Adisorn O.
Mar 240 min read
6 views
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