Rib width of ribbed-waffle slabs cannot be less than 10cm (T.S. 500 11.3.2)
According to TS500 11.3.2 for ribbed and waffle slabs, the width of the rib should be at least 10 cm. A warning is given when the rib width on toothed floors is less than 10 cm.
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Possible solutions:
Entering rib width greater than 10 cm for ribbed or waffle slab.
Changing the slab type.
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