| 基于汶川地震的LRB与RB隔震连续梁桥地震响应对比研究 |
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| 引用本文： | 马涌泉,陈水生.基于汶川地震的LRB与RB隔震连续梁桥地震响应对比研究[J].世界地震工程,2012,28(1):130-134. |
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| 作者姓名： | 马涌泉 陈水生 |
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| 作者单位： | 华东交通大学土木建筑学院,江西南昌,330013 |
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| 基金项目： | 国家自然科学基金重点资助项目(50868007);江西省自然科学基金重点资助项目(550012) |
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| 摘 要： | 为了研究铅芯橡胶支座(LRB)和板式橡胶支座(RB)对连续梁桥地震响应及隔震效果的影响,分别采用Bouc - Wen滞回恢复力模型模拟LRB的力-位移非线性特性,采用直线型恢复力模型模拟RB的本构关系,通过结构离散建立了非隔震、LRB隔震和RB隔震3种连续梁桥的有限元计算模型,运用四阶显式Runge - Kutta迭代法和Newmark时间积分法联合求解增量形式的全桥动力微分方程,并结合算例对3种连续梁桥有限元计算模型分别输入汶川地震波进行非线性时程对比分析.结果表明:LRB在控制梁体与支座位移,降低结构加速度和墩、台底内力响应方面均比RB的效果要显著；采用RB隔震后,梁体与支座的位移响应均较大,在桥梁隔震设计时要予以充分重视.
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| 关 键 词： | 隔震连续梁桥 汶川地震 隔震 铅芯橡胶支座 板式橡胶支座 非线性时程分析 地震响应 |
Comparative research on seismic response of isolated continuous bridges with LRB and RB based on Wenchuan earthquake |
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| MA Yongquan
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CHEN Shuisheng.Comparative research on seismic response of isolated continuous bridges with LRB and RB based on Wenchuan earthquake[J].World Information On Earthquake Engineering,2012,28(1):130-134. |
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| Authors: | MA Yongquan CHEN Shuisheng |
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| Institution: | (School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China) |
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| Abstract: | In order to investigate the seismic response and isolated effect of bridges installing with LRB and RB,Bouc-Wen restoring force model was adopted to simulate the nonlinear hysteric characteristics for LRB,and linear restoring force model is adopted to simulate the constitutive relation for RB FEM computation model considering no isolation,LRB isolation and RB isolation was established by making the structure discrete,both the Newmark and Runge-Kutta iterative strategy were used to solve the increment form’s nonlinear governing equation of motion,combining numerical example and input of Wenchuan seismic waves to various FEM computation models the nonlinear time-history contrast analysis was carried out.The resuts indicate that LRB is remarkable effective on controlling beam and bearings displacement,reducing structural acceleration and the internal force at bottom of piers and abutment in comparison with RB;But in case to use RB isolator,the displacement responses of beam and bearings are all larger so attertion should be paid to this in isolation design of bridges |
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| Keywords: | isolated continuous girder bridges wenchuan earthquake isolated seismic lead rubber bearings rubber bearings nonlinear time-history analysis seismic response |
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