Advanced Scalar-valued Intensity Measures for Residual Drift Prediction of SMRFs with Fluid Viscous Dampers

Abstract

—Maximum Residual Inter-story Drift Ratio (RIDR max ) plays an important role to specify the state of a structure after severe earthquake and the possibility of repairing the structure. Therefore, it is necessary to predict the RIDR max of Steel Moment-Resisting Frames (SMRFs) with high reliability by employing powerful Intensity Measures (IMs). This study investigates the efficiency and sufficiency of scalar-valued IMs for predicting RIDR max of two sets of the 3-Story, 6-Story, and 9-Story SMRFs with and without using linear Fluid Viscous Dampers (FVDs). Incremental Dynamic Analysis (IDA) was performed with considering RIDR max as engineering demand parameters using Opensees. Results of analysis showed that two scalar-valued IMs of IM M (α=0.5 ) and Sa avg M-D had lower values of the variations of standard deviation of natural logarithm of IM of RIDR max , σlnIM RD , which shows the efficiency of these IMs. Moreover, these scalar-valued IMs achieved higher p - values with respect to seismic ground motion features of M, R, and Vs30, which shows the sufficiency of assumed IMs. Therefore, two scalar-valued IMs of IM M (α=0.5) and Sa avg M-D are proposed as optimal scalar-valued IMs for predicting the RIDR max of SMRFs