Seismic Analyses of Long-Span Cable-Stayed Bridges Subjected to Near-Fault Pulse-Type Ground Motions

Abstract eng:
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.

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