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What is the allowable deflection of flat slabs ?

Real Estate Civil Engineering Project Management
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Question added by soha mohamed
Date Posted: 2016/08/10
Upvote (0) Views (57) Followers (6) Answers (5) Report Question
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Mohammad Afify

For slabs = Span/250 For beams = Span/360 For cantilevers = Span/450 According to Egyptian code

Nader Ali
by Nader Ali , Technical office manager , AlSafwa Contracting

As per ACI

1-flat roofs immediate deflection  due to live load = L/180

2-Roof or floors attached to non structural elements (not) likely to be damaged by large deflections due to long term deflection (dead loads+ the sustained part of live loads+creep+shrinkage effection) = L/240

3- if the roof attached to glass or cladding or Gypsumboard No.2 will be = L/480

Ahilan R
by Ahilan R , Scientific Assistant-D , Nuclear Power Corporation of India Ltd (NPCIL)

Deflection shall not exceed span/250

Muhammad Yousaf
by Muhammad Yousaf , Site Civil Engineer , Abid brothers contractors

 

Flat roofs not supporting or attached to non-structural elements likely to be damaged by large deflection.

Immediate deflection due to the live load.

L/180*

Ahmed Hassan Mohamed Ahmed
by Ahmed Hassan Mohamed Ahmed , Project Manager (Consultant) , Cofftea

It depends on the code requirements. But defect can be controlled by limiting cracks to .3 mm width as per BS

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