摘要
本文分别选取台湾集集和Imperial Valley地震中有、无速度脉冲效应的两类实际地震记录作为地震动输入,基于一座实际连续梁桥,通过SAP2000软件建立有限元分析模型,以铅芯橡胶支座、拉索减震支座为研究对象,以非减震体系为对比,系统考察了速度脉冲对减隔震连续梁桥纵向地震响应的影响。结果表明:速度脉冲对非减震以及减隔震连续梁桥的纵向地震响应均有放大作用;在速度脉冲作用下,与非减震桥梁结构相比,虽然铅芯橡胶支座能较大程度减小地震内力响应,但支座变形能力无法满足变形需求,而拉索减震支座在实现减小桥梁地震内力响应的同时仍具有较好的限位能力,重视力与位移之间的平衡,具有较好的减隔震效果。
Three pulse-like and three non-pulse-like near-fault ground motions used as input waves are selected from Taiwan Chi-Chi and Imperial Valley earthquake records. A continuous beam bridge is selected as background to build finite element models by SAP2000. Compared with non-seismic isolated bridge,leader rubber bearing( LRB) and cable-sliding friction aseismic bearing( CSFAB) are selected as research objects to comprehensively inspect the seismic response of seismic isolated bridge using the two bearings. The result shows that the velocity pulse effect would magnify the longitudinal seismic response of both non-seismic isolated and seismic isolated bridge. When under velocity pulse,compared with non-seismic isolated bridge,although the LRB can achieve high isolated rate,the ability to deform cannot satisfy the need of deformation. CSFAB can both reduce the internal force and show good performance on restricting the displacement,valuing the balance between internal force and displacement,representing excellent isolation effect.
引文
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