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防落梁板式橡胶支座抗震性能分析

Keywords: 桥梁,抗震性能,落梁,防落梁板式橡胶支座

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Abstract:

针对板式橡胶支座在地震作用下存在落梁风险的问题,开发了防落梁板式橡胶支座(unseating-preventionlaminatedrubberbearing,URB).在介绍该支座基本情况的基础上,以高烈度区典型预制桥梁为例进行罕遇地震作用分析,并对该支座的基本参数进行了研究.分析结果表明:该防落梁板式橡胶支座可通过钢丝绳限制桥梁上、下部结构间发生过大的相对位移,既可保护支座,又能降低落梁风险;虽然会增大桥墩的地震响应,但通过调整钢丝绳参数可降低这种不利影响;钢丝绳初始间隙和拉伸刚度是该防落梁板式橡胶支座的主要参数,初始间隙要同时满足正常使用和地震作用的要求,拉伸刚度应结合支座本身及桥墩受力确定.

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