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Using proper Drift Value in ASCE 7-16 Seismic Design
The table below summarizes the drift value used for different seismic design purposes. We have 2 drift values Elastic drift from reduced...
Adisorn O.
May 101 min read
Recommended Core Wall Thickness for Highrise Concrete Buildings (Flat plate)
The table below shows the common thickness of the core wall for SDC C. The suggested thickness is in the range of h/140-h/160, where h is...
Adisorn O.
May 101 min read
Diaphragm Design Calculation Sheet – Collector and Shear Checks As ACI318-19
by alpsconsult 1. Collector (Drag Strut) Design (with Ω₀ ) Given: - Axial force from ETABS (Fx) = 220 kN (tension) - Overstrength...
Adisorn O.
May 103 min read
Joint Shear Design (For SDC B and higher)
In all SMRF from SDC B, ACI requires to check the joint shear strength. It's sometimes overlooked and we could end up with the SMRF with...
Adisorn O.
May 81 min read
Overturning Stability of Foundation
A photo taken in Mandalay, Myanmar, after the M8.2 earthquake event. This emphasizes the importance of checking foundation stability. It...
Adisorn O.
May 41 min read
When to Include Special Seismic Load according to ASCE 7-16?
ASCE 7-16 §12.4.2.2 & §12.4.2.3 These sections define how vertical seismic effects (Ev) are added to load combinations. ✅ Summary:...
Adisorn O.
Apr 301 min read
Is it allowed to use concrete pile without dowel bars in SDC C?
❌ No . According to ACI 318-14 (ASCE 7-10), we need to extend at least pc strand from concrete pile into pilecap. For using pc strand...
Adisorn O.
Apr 301 min read
🏗️ Understanding Axial Force Restraint in Post-Tensioned Slabs: A Practical FEM-Based Approach for Ground Floor Analysis
Introduction In post-tensioned (PT) concrete slab design, one subtle yet critical phenomenon is the axial restraint that develops at the...
Adisorn O.
Apr 283 min read
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
🌟Formulation for 3D Truss Element Transformation — With MATLAB Code
by alpsdev, 2025 When working with 3D truss structures , the transformation between local and global coordinates becomes crucial....
Adisorn O.
Apr 273 min read
Choosing Shear Wall Thickness: h/25 vs h/16 — What Should We Follow?
In seismic design, setting the right shear wall thickness is far more important than just passing code checks. It’s about ensuring...
Adisorn O.
Apr 272 min read
🏗️ Caution in Bearing Load Transfer: Why Pilecap Concrete f'c Should Not Be Too Low Compared to Column f'c
📖 Introduction In structural foundation design, particularly for pile caps receiving high axial loads from columns , the transfer of...
Adisorn O.
Apr 263 min read
🏗️ Foundation Bearing Check: Why You Should Never Place a Column at the Edge of a Pile Cap
📖 Introduction In foundation design, particularly for pile caps and spread footings , verifying the bearing stress at the...
Adisorn O.
Apr 263 min read
🚀 Breaking Ground with SEISMIC-PILE: Our Custom FEM Tool for Lateral Pile Analysis
By alpsdev 2025 🔧 Key Features Implemented: ✅ FEM-Based Beam Modeling True 2D beam elements with 2 DOFs per node Supports bending...
Adisorn O.
Apr 241 min read
🏗️ Understanding Pushover Analysis and Capacity Spectrum Method (CSM)
by alpsdev · April 2025 🔎 What is Pushover Analysis? Pushover analysis is a nonlinear static method used to evaluate structural...
Adisorn O.
Apr 242 min read
🧠 From Theory to Practice: General FEM-Based Shear Distribution for Complex Shear Walls
Author: Adisorn Owatsiriwong, D. Eng. 🔍 Problem Statement In modern seismic design, shear walls are critical lateral force–resisting...
Adisorn O.
Apr 222 min read
🔍 Understanding the Response Modification Factor (R) and Overstrength Factor (Ω₀) in Seismic Design
In seismic design, engineers use a blend of structural capacity, ductility, and energy dissipation behavior to ensure life safety and...
Adisorn O.
Apr 222 min read
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.
Apr 223 min read
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