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Posts tagged: concrete
6 posts tagged with “concrete”.
Stiffness Modifiers in ETABS: Why One Uniform Value Corrupts Your Load Path
Pick one number, often 0.35, and apply it to everything. It feels consistent. It's actually one of the quieter ways to get a load path wrong, because the point of cracked-section modifiers is that different elements crack differently.
5 min read
Coupling Beams: The Most Abused Element in Tall-Building Design
The coupling beam is small, awkward, and sits in the way of the architecture. It's also the element that decides how your coupled-wall system actually behaves, and it gets modelled wrong more often than almost anything else in a tall building.
6 min read
The Shear Modifier Everyone Forgets: f12 on Walls in ETABS
Most engineers diligently crack their walls for bending and leave the shear stiffness at full value. For squat walls, spandrels, and basement walls, that single oversight quietly distorts the entire lateral distribution.
6 min read
Construction Sequence: The Loads Your Final-Condition Model Never Sees
Your model analyses a finished building under its design loads. The structure has to survive every stage of getting there — half-built, propped, eccentrically loaded — and some of those stages are worse than the day it opens.
5 min read
PT Slabs: The Secondary Moments That Quietly Govern Your Design
In a continuous PT slab, the prestress doesn't just balance load — the supports fight the camber it induces, and that restraint generates moments that survive all the way to your ultimate strength check.
5 min read
Differential Column Shortening: The Movement Your Static Model Doesn't See
Run a tall concrete building in one shot and every column lands at the right level. Real buildings don't get built in one shot — the core and the columns shorten at different rates over years, and the difference redistributes force you never designed for.
9 min read