Response modification factor - Review paper

Abstract

Response modification factor (R) has a main function in the seismic design of new construction materials and is a seismic design parameter in equivalent static analysis. It determines the nonlinear performance of building structures during strong earthquakes. R is based on experimental test and engineering judgment, and no uniform technique exists to determine such a value for different conditions. The development in the reliability of modern earthquake-resistant buildings requires systematic assessment of building response characteristics that mainly affect the rates allocated to R, which is formulated based on three aspects, namely, strength, ductility, and redundancy factors. Response modification is affected by the height of structures. This review paper aims to summarize relevant information from different experimental and analytical studies on overstrength, ductility, and R.