Spread footing design method
It usually designed to use 3 ksi < f'c < 4 ksi, whereas modern structural members frequently use concrete between the range of 4 ksi < f'c < 8 ksi.
It usually designed to use 3 ksi < f'c < 4 ksi, whereas modern structural members frequently use concrete between the range of 4 ksi < f'c < 8 ksi.