Seismic fragility analysis of steel-concrete composite bridges excited by near-fault ground motions
Liu Yang 1,2 Lu Dagang 1,2,3 Yu Xiaohui 1,2
1. Key Lab of Structural Dynamic Behavior and Control of China Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
3. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract：The seismic fragility analysis was conducted for a steel-concrete composite bridge (SCCB) including the effects of the near-fault pulse-like ground motions. A total of 60 real ground motions were selected from the PEER strong earthquake database as the inputs. The global fragility curves and local fragility curves of the bridge were obtained through the fragility analysis. Compared to the fragility results of the far-field earthquake records, it is found that the demands due to the near-fault ground motions are significantly larger than that due to the far-field ground motions. Under the near-fault pulse-like ground motions, the pier is the most fragile component, while the concrete crossbeam and the studs are less fragile.
