SEISMIC ANALYSES OF LONG-SPAN CABLE-STAYED BRIDGES SUBJECTED TO NEAR-FAULT PULSE-TYPE GROUND MOTIONS
The pulse effect of near-fault ground motions and its effect on engineering structures with fundamental period were investigated in this study. The pulse character of many near-fault ground motions and its causes were introduced briefly. Near-fault ground motions from 8 stations during 1999 Chi-Chi, Taiwan earthquake and four common-used ground motions were selected to investigate the near-fault pulse effect. Response spectrum of these ground motions illustrated that there was abundant long-period component in pulse-type near-fault ground motions. The seismic performance of a constructed long-span cable-stayed bridge was evaluated by time history analysis method. The seismic behavior of the bridge to near-fault with and without pulse effect and common-used ground motions were investigated and compared. It is concluded that pulse-type near-fault ground motions will impose more sever damage potential to engineering structures with long fundamental period. Distinct underestimation of the structural response will be presented if pulse effect of near-fault ground motion is not considered, especially for engineering structures located near an underlying causative fault. Vertical pulse-type near-fault ground shaking should be got more attention in the seismic design and performance assessment of engineering structures in the near-fault region. Parametric study indicated that there is a nearly linear relationship between PGV/PGA ratio, spectral acceleration and spectral velocity of the ground motion and structural response.
near-fault ground motion pulse effect vertical ground motion long-span cable-stayed bridge parametric study
J.F. Jia J.P. Ou
School of Civil Engineering, Harbin Institute of Technology, Harbin. China School of Civil Engineering, Harbin Institute of Technology, Harbin. China;School of Civil & Hydraul
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）