Performance Evaluation of SRPMM in a 5-Story Steel Building Using Pushover Analysis with Variations in Deformation-Controlled and Force-Controlled Modeling

Abstract

This study utilizes pushover analysis to evaluate the performance of Intermediate Moment Resisting Frame System (IMRFS) used as the lateral force resisting system on the five stories building. Two structural models were analysed with differences on plastic hinge allocations and the controlling behaviour. On Model 1, plastic hinges were assigned to the designated beam and columns with deformation-controlled behaviour, while on Model 2, the plastic hinges on the columns were changed to force-controlled. Building modelling was in 3-dimension using ETABS v.20.0.0. Evaluations of the structural performance used two methods. Based on the structural performance evaluation using the Capacity Spectrum Method (CSM) and the Displacement Coefficient Method (DCM), the performance level of Model 1 is IO–LS in the X direction and > CP in the Y direction. Meanwhile, the performance level achieved by Model 2 is > CP in both the X and Y directions. In addition to the performance level evaluation, verification was also conducted on the values of the response modification factor (R), overstrength factor (Ω₀), and deflection amplification factor (Cd) obtained from the pushover analysis. The R values for both models are approximately 3, which is lower than the R value specified for SRPMM in SNI 1726:2019. The Ω₀ values for Models 1 and Model 2 are approximately 1.5 and 2.4, respectively. The Cd values for Models 1 and Model 2 range from 4.3 to 4.8 and from 5.5 to 5.8, respectively, for both the X and Y directions.