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LRB隔震连续梁桥非线性地震响应研究 被引量:4

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摘要 以铅芯橡胶支座(LRB)为隔震设备,分析了一座典型的3跨连续梁桥在4条具有不同场地土特色地震波作用下的峰值响应。通过对结构的离散建立了包含LRB贡献在内的全桥有限元模型,采用Bouc-Wen双向耦合恢复力模型模拟LRB的力-位移非线性特性,运用有限单元方法建立系统动力特性矩阵,编制了使用四阶显式Runge-Kutta迭代法和Newmark时间积分法联合求解增量形式全桥非线性动力方程的时程分析程序。利用程序并结合算例对隔震和非隔震桥梁进行了对比分析。分析结果表明:LRB具有良好的隔震效果,能显著降低结构的地震响应;支座的屈服强度和硬化比对结构的隔震效果有很大的影响,对于某种地震激励,LRB存在一个最优的屈服强度值和适宜的硬化比值;桥墩高度对结构顺桥向的地震响应影响较大,对横桥向地震响应的影响并不明显;LRB在Ⅲ类场地土上的隔震效果较差,因此LRB隔震连续梁桥不适合修建在软土地基上。
出处 《中外公路》 北大核心 2011年第6期146-152,共7页 Journal of China & Foreign Highway
基金 国家自然科学基金重点资助项目(编号:50868007) 江西省自然科学基金重点资助项目(编号:550012)
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参考文献12

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