Ezil Engineering

21/05/2026

ANNOUNCEMENT: New Video Coming This Sunday!
Title: How to Check Torsional Flexibility of 3B+G+15 Apartment Building as per Eurocode Standard on CSI ETABS Software.

This Sunday, I’m releasing a complete step‑by‑step tutorial on torsional sensitivity checking for an 20‑story building.
What you will learn from this video (Sunday):

✔️ How to extract Center of Mass (CM) and Center of Rigidity (CR) directly from ETABS?
✔️ How to calculate the ratio of gyration (ls) and the radius of gyration (r)
✔️ The exact Eurocode condition to determine torsional flexibility – is r > ls or not?
✔️ Full workflow for a 3B+G+15 RC frame under seismic loading

I will share the exact Excel template we use in the Sunday video.

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29/04/2026

Welcome to Part 1 of this essential series for structural engineers working on tall buildings. Before you design a single beam or column of a 20‑story apartm...

29/04/2026

1 like. "4 Pre Design Checklists 20 Story Buildings in etabs – Part 2 P delta effect or second order analysis"

13/04/2026

What is the P-Delta Effect (Second-Order Moment)? When a horizontal force (like wind or an earthquake) pushes a building, it sways. The vertical gravity loads (the weight of the structure), now acting at a slight offset from the building's base, create an extra overturning moment. This additional moment is the second-order moment and its effect is called the P-delta (P-Δ) effect. Eurocode 8 (EN 1998-1) uses the interstory drift sensitivity coefficient, θ (theta), to decide whether P-delta effects need to be considered in seismic analysis. It is calculated per story as:

θ = (Ptot × dr) / (Vtot × h)

Where:

Ptot is the total gravity load at and above the story.

dr is the design interstory drift.

Vtot is the total seismic story shear.

h is the interstory height. The required actions based on θ are:

θ ≤ 0.1: P-delta effects can be neglected.

0.1 < θ ≤ 0.2: P-delta effects must be considered. A simplified approach is allowed, where all seismic action effects are multiplied by the amplification factor 1/(1-θ).

θ > 0.2: The structure is too flexible. A full non-linear second-order analysis is mandatory 👉 Follow me so you don't miss it:

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12/04/2026

Important video from my YouTube channel

Welcome to Part 1 of this essential series for structural engineers working on tall buildings. Before you design a single beam or column of a 20‑story apartm...

10/04/2026

All of you must check for drift during structural design after analysis, but before design of structural elements.what is drift & checklists?
Damage Limitation or drift It ensures that during a moderate, frequent earthquake, the building suffers only minor, repairable damage. Non-structural elements like walls, partitions, and facades remain largely undamaged. This keeps repair costs low and allows the building to remain functional after the event.
dᵣ · ν ≤ 0.010 · h

Where:

dᵣ = design inter‑storey drift (inelastic, in meters)

ν = reduction factor (for Importance Class II residential buildings, ν = 0.5)

h = storey height

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09/04/2026

📢 Tomorrow – New Video!

Title:
How to Calculate Drift & Damage Limitation in ETABS for 3B+G+15 Apartment – Eurocode Standard

What you'll learn:
📌 Step-by-step drift & damage limitation check in ETABS
📌 Use our Excel checklist template during the tutorial
📌 I’ll share the template free to subscribers
📌 As a senior structural engineer, I’ll interpret the results and give a clear final conclusion (pass/fail + recommendations)

Perfect for structural engineers working on tall buildings in seismic zones.

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05/04/2026

Structural Engineer’s Take: What’s a “Dummy Beam” on a Flat Slab Cantilever? 🏗️

If you’re designing a flat slab with a cantilever edge (balcony, roof overhang, etc.), you’ve probably come across the term “dummy beam.”
It’s not a primary structural beam, but it plays a key role. Let’s break it down.

🔍 What Is It?

A dummy beam is a non‑structural edge thickening cast integrally with the slab.
Think of it as a stiffened rib that:

· ✅ Acts as permanent formwork – no temporary edge shuttering needed
· ✅ Increases edge stiffness → less deflection & vibration
· ✅ Prevents curling due to shrinkage/temperature effects
· ✅ Distributes point loads (railings, glass partitions, balcony cladding)

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