Springer Verlag, Earthquake Engineering and Engineering Vibration, 3(13), p. 455-470
Most of the present seismic design includes the nonlinear response of a structure through a response reduction factor (R). It allows the designer to use a linear elastic force-based approach while accounting for nonlinear behaviour and deformation limits. In fact, the response reduction factor is used in modern seismic codes to scale down the elastic response of a structure. This study focuses on estimating the actual 'R' value for engineered design/construction of reinforced concrete (RC) buildings in Kathmandu Valley. For this, the ductility and overstrength of representative RC buildings in Kathmandu are investigated. Non-linear pushover analysis was performed on structural models in order to evaluate the seismic performance of buildings. For this, twelve representative engineered designed irregular buildings of various characteristics in Kathmandu Valley were selected and studied. Furthermore, the effects of overstrength on the ductility factor, of beam column capacity ratio on the building ductility and of load path on the response reduction factor are examined. Finally, the obtained results are further analysed and compared with different structural parameters of the buildings.