AMRITHA

Thanks for the information.

The stiffness modifier for beams = 0.35I column = 0.7I and slabs 0.25I. they are required to consider the cracking of the members. my question is why do we consider 35% of stiffness for beams while code says we can use 70% of stiffness for columns? what is the significance of the numbers 35 , 70 , 25??