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Showing results for tags 'minimum reinforcement'.
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Salam, What is history of 1 percent minimum reinforcement in RCC columns, could we reduce it where columns have very large size due to architectural reasons and Moment Frames has very low demand, please guide. Thank You
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The minimum amount and spacing of reinforcement to be used in structural floors, roof slabs, and walls for control of temperature and shrinkage cracking is given in ACI 318 or in ACI 350R. The minimum-reinforcement percentage, which is between 0.18 and 0.20%, does not normally control cracks to within generally acceptable design limits. To control cracks to a more acceptable level, the percentage requirement needs to exceed about 0.60% (REFRENCE ACI COMMITE REPORT 224R-01) So according to above statement , should we follow 0.60%, to be on more safe side??
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- minimum reinforcement
- water tight structures
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Hello Fellow Engineers. Well I do Know that, Etabs Checks all the members for there minimum area of Reinforcement as per code. But I came across one design of mine where I see for a beam size of 228.6 mm wide and 304.8 mm deep. Etabs gives Bottom reinforcement less than what I calculated manually. I am attaching a few pics for the problem. I request to please put some light on this. The beam is designed for M20 and Fe 415 steel.
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Following are the limitations imposed by ACI for calculating minimum reinforcement in case of slabs and beams: As (min) = 0.002 bh or 0.0018 bh (for slabs) As(min) = (200/ fy ) b x d ( Governing for beams when fc' < 4500 psi) I tried to calculate isolated footing flexural reinforcement with both these methods and the results were quite different. Eq of slab when used gave me a min reinforcement of #4@8" c/c whereas beams equation gave a minimum reinforcement of #4 @ 4" c/c. My question is when to use each of them in footing and which one is the more reliable approach to use. Thanks
