Abstract: In the current circumstance many codes and researchers have recommended stiffness modifiers values for R.C.C. structure analysis. Because stiffness is the most important quality of any element, it demonstrates its ability to resist external force and solidity. In linear structural analysis programmes, stiffness modifiers are employed to account for the development of concrete fractures and the bond slip of steel reinforcement. The global and local deformations of the structure, as well as the internal force distribution in the elements, are all factors in seismic design. The aim of current study was found out the stiffness modifiers which can be applied for the same size of PT beam in analysis software. The study was carried out in ETABS V18 software. The structural behaviour of the structure is analysed after applying the new results of stiffness modifiers.

Keywords: Stiffness Modifiers, Effective Stiffness, PT beams, displacement, storey drift, Structural performance.

| DOI: 10.17148/IARJSET.2022.9598