Seismic Vulnerability Assessment Of An Rc-Frame Building Exposed To Different Direction Components Of Ground Motions Using Nonlinear Dynamic Analysis And Fragility Function

• Main Author: Yusoff, Muhammad Umar Mohd
• Format: Monograph
• Language: English
• Published: Universiti Sains Malaysia 2022
• Subjects: T Technology; TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.usm.my/57727/1/Seismic%20Vulnerability%20Assessment%20Of%20An%20Rc-Frame%20Building%20Exposed%20To%20Different%20Direction%20Components%20Of%20Ground%20Motions%20Using%20Nonlinear%20Dynamic%20Analysis%20And%20Fragility%20Function.pdf; http://eprints.usm.my/57727/

RC frame buildings are highly vulnerable to damage from seismic excitation, especially the influence of different earthquake direction components. In this study, the seismic vulnerability assessment of the selected RC-frame building located in Padang City, Indonesia that is exposed to different direction components of ground motions was carried out. This study aims to evaluate the seismic performance of the building using vulnerability functions while considering earthquake different direction angles that are specified respectively in both X, Longitudinal Direction (E-W) and Y, Transverse Direction (N-S), starting from 0° to 60° angle with 15° angle increments. By using ETABS 19 software, Incremental Dynamic Analysis (IDA) and fragility function are performed to evaluate the seismic performance of the building subjected to three sets of ground motion excitations with magnitudes ranging from 6 to 7. The IDA curves are constructed and then applied to generate the fragility curves. With accordance with FEMA 356, the IDA curves are compared based on three performance levels: Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP). The results from the IDA curves reveals that in the X-direction, an increasing incidence angle requires a lower PGA to produce structural damage. In the Y-direction, 60˚ angle provides the lowest PGA value at the LS and CP performance levels, while an angle of 45 provides the lowest PGA value at the IO level. Fragility curves show the 60˚ angle caused highest damage probability to the building in both X and Y-direction, respectively. As a result, this reveals that the higher the angle of incidence from building main axes, the higher the structural damage caused. In this case, the earthquake excitation coming from 60˚ angle in X and Y-direction, respectively is more damaging and dangerous.