高架桥梁抗震设计及拉索减震支座的应用

The application of CSFAB in viaduct bridge seismic design

处于地震高烈度地区的大跨混凝土连续梁桥往往需要引入减隔震设计来解决抗震问题,如何进行减隔震设计方案的比选仍然是摆在工程师面前的难题。本文以泉州高架桥中使用较多的标准联3×30m跨径连续梁桥为工程背景,建立全桥有限元模型,进行了双曲面球钢支座、铅芯橡胶支座以及拉索减震支座三种减隔震方案的非线性时程分析。计算结果表明拉索减震支座不仅在减小墩底内力方面效果良好,而且在控制墩梁相对位移方面优势明显,可以满足结构的抗震需求,是高架连续梁桥减隔震体系的理想解决方案。

Earthquake action is often a major factor of bridge design controlling for large span concrete continuous girder bridge in high seismic risk zone. It is a vexed question for engineers to choose a reasonable seismic isolation design. A three span continuous girder bridge （3 × 30m） in Quan Zhou is analyzed in this paper. Finite element model is built with double spherical aseismic bearing, lead rubber bearing（LRB） and cable-sliding friction aseis- mic bearing（CSFAB） respectively. The isolation effect of different bearings is studied by nonlinear time history a- nalysis. Results indicate that, CSFAB can not only reduce the internal force at the bottom of the pier, but also have great advantages in controlling the relative displacement between girder and pier. Thus CSFAB is adequate to meet the demands of structural seismic performance.