采用摩擦摆支座的超大跨连续梁桥隔震效果

发布时间：2018-03-28 21:07

本文选题：超大跨度　切入点：连续梁桥　出处：《厦门大学学报(自然科学版)》2017年03期

【摘要】：为了研究超大跨连续梁桥采用摩擦摆支座的隔震效果,以某主跨为240 m的七跨钢-混凝土连续梁桥为工程背景,建立桩土相互作用动力分析模型,采用非线性连接单元模拟盆式滑动支座及摩擦摆支座的非线性受力性能.非线性地震响应分析结果表明:采用传统抗震体系时,超大跨连续梁桥的固定墩及其桩基础的内力需求非常大;采用摩擦摆支座的隔震体系可以减少固定墩及其桩基础内力约40%,并显著改善其他桥墩的地震力分配.摩擦摆支座对超大跨连续梁桥的减震机理主要体现为:延长结构自振周期、减小固定墩有效振动质量、改变地震力传递途径、增强附属装置耗能,从而显著地改善了超大跨连续梁桥的地震响应.
[Abstract]:In order to study the isolation effect of friction pendulum bearing in super-large span continuous beam bridge, a dynamic analysis model of pile-soil interaction is established with a seven-span steel-concrete continuous beam bridge with 240 m main span as the engineering background. The nonlinear behavior of basin sliding support and friction pendulum bearing is simulated by nonlinear connection element. The results of nonlinear seismic response analysis show that: when the traditional seismic system is adopted, The internal force demand of the fixed pier and pile foundation of super-large span continuous beam bridge is very large. The seismic isolation system with friction pendulum supports can reduce the internal force of the fixed pier and its pile foundation by about 40%, and significantly improve the distribution of seismic force of other piers. The mechanism of vibration absorption of the friction pendulum bearing on the long-span continuous beam bridge is as follows: prolonging the natural vibration period of the structure. By reducing the effective vibration mass of fixed pier changing the transmission path of seismic force and increasing the energy consumption of auxiliary devices the seismic response of long-span continuous beam bridge is improved significantly.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金(E51508102) 福建省教育厅重点项目(JK2014005) 教育部博士点基金(20133514120006)
【分类号】：U442.55

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