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2 posts
Guide

Deflection: Why the Cracked Section Changes Everything

Run a deflection check on the gross concrete section with the short-term modulus and a beam will pass comfortably. Run the same beam cracked and creeping, as it will actually behave, and the answer is roughly twelve times larger. This article works one 7 m beam through both routes and shows exactly where the factor of twelve comes from.

CivilAxis · 2 Sept
Structures

The 0.3 mm Crack Limit: What It Actually Protects

Almost every reinforced concrete element gets checked against a 0.3 mm crack width, and almost nobody asks what that number is for. It is not about leaks and it is not about looks. Working the calculation by hand reveals a genuine paradox: increasing the cover to protect the steel makes the surface crack wider.

CivilAxis · 31 Aug