SEISMIC VULNERABILITY ASSESSMENT OF ZONE 4 AND 5 OF ISLAMABAD

Abstract

Pakistan's construction sector is undergoing continuous improvement, reflected in the recent update of its building code. This research explores the transition from the previous Building Code of Pakistan (BCP-07) and utilizing peak ground acceleration (PGA) for seismic design, to the new BCP-21. BCP-21 for a more comprehensive assessment of seismic demands on structures. This research builds upon existing seismic vulnerability assessments of RC structures by focusing on present-day construction practices in Pakistan. The initial phase involves calibrating of a joint assembly in PERFORM 3D to understand joint shear degradation. This model is validated against experimental data provided. Furthermore, a seismically deficient RC frame is modelled and analysed using time-history analysis. This framework is applied to assess the vulnerability of typical RC structures of zone 4 and 5 of Islamabad. Buildings are separated into pre-code and post-code to draw conclusions and propose recommendations for enhancing the seismic performance of these structures