Published Paper Details:

The response reduction/modification factor(R) is defined as an essential seismic design tool, usually used to specify the in-elasticity expected level in structure during earthquakes. The concept of response reduction/modification factor(R) depends on the observations that well detailed seismic framing systems can maintain large in-elastic deformations without collapse. When a RC structure is subjected to the lateral loads, a base shear, which is prominently higher than the actual structure response, is created. Thus, it possesses a significant amount of over-strength or reserve strength. Over-strength is developed because maximum lateral strength of any RC structure always exceeds its design strength. Once it enters the inelastic phase, it is capable of resisting and absorbing a large amount of seismic energy. Hence, seismic codes introduce a reduction in design loads, taking benefit of the fact that the structure possesses over-strength and ductility as per Asgarian and Shokrgozar (2009).This force reduction factor is called Response Reduction/Modification Factor(R). Furthermore, the aim of this research is to investigate the variation of seismic response of special RC structures with different configurations, such as elevated metro stations. Consequently, the response reduction factor can be evaluated. Then the calculated response reduction/modification factors (R) for reinforced concrete (RC) structures will be compared to those specified in ECP and the ASCE code.For this purpose, a three dimensional Finite Element Method was used for modelling the RC structure using ABAQUS V.6.14 program.