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Minimum (As) reinforcing steel in footing

Minimum (As) reinforcing steel in footing

Minimum (As) reinforcing steel in footing

(OP)
In footings many engineers tend to ignore this minimum steel ratio bw x d x 200/fy . Does ACI or any thing relevant confirms this anywhere. Thanks in advance.

RE: Minimum (As) reinforcing steel in footing

You can only ignore it if 4/3 of the required steel is less than T&S steel.  ACI says that if your required stee; ratio is below the minimum steel ratio you can get around the 0.0033 minimum by increasing by 1/3..  If, however, you increase it by 1/3 and you are still below the minimum As for T&S you MUST use the minimum for T&S which is 0.0018bh.

RE: Minimum (As) reinforcing steel in footing

In ACI-318, Section 10.5.1 gives that as the As,min for "flexural members".  Section 10.5.4, three paragraphs down, gives As,min for "structural slabs and footings of uniform thickness" as that required by 7.12.

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