Answer / jebaraj

1.5 for concrete structures and 1.15 for steel structures.. As per limit state method ... For water retaining structures such as water tanks, dams factor of safety is 3 as per working stress method

Answer / abdul aziz

1.5 Times safety factor in structure design

Answer / omair

Factor of safety is required to bring the structure from state of collapse to a usable state, that is a structure should be able to withstand the changes in loads to atlst some extent.It covers uncertainties in forces and loads

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