| 多维地震输入下曲线匝道桥梁伸缩缝碰撞响应 |
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| 引用本文： | 王天利,李青宁,郭昕.多维地震输入下曲线匝道桥梁伸缩缝碰撞响应[J].世界地震工程,2012,28(1):39-43. |
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| 作者姓名： | 王天利 李青宁 郭昕 |
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| 作者单位： | 西安建筑科技大学土木工程学院,陕西西安,710055 |
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| 基金项目： | 国家自然科学基金(51078306);高等学校博士学科点专项科研基金(20106120110004);西安建筑科技大学重大科技创新基金(ZX0901);陕西省重点学科建设专项资金(E01004) |
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| 摘 要： | 针对曲线匝道桥梁伸缩缝地震碰撞破坏现象,依托某市多层互通式立交体系中一座独立、单支、多联、曲线、箱梁匝道桥,用Kelvin接触单元模拟了伸缩缝处地震和碰撞效应,建立了全桥空间动力分析模型。利用非线性时程分析法,分别输入单维(X方向、Y方向)和多维共8种地震动工况,分析了曲线匝道桥梁伸缩缝的地震碰撞响应差异。结果表明:曲线匝道桥梁由于曲率的影响,不同方向地震动响应存在耦合效应,其伸缩缝碰撞响应的最不利值应考虑多维地震输入工况,并用碰撞力和碰撞位移双指标控制伸缩缝的地震碰撞响应。
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| 关 键 词： | 曲线匝道桥梁 伸缩缝碰撞响应 非线性时程分析法 空间动力模型 多维地震输入 地震响应耦合 |
Pounding response of expansion joint in a curved ramp bridge under multidimensional seismic input |
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| WANG Tianli
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LI Qingning
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GUO Xin.Pounding response of expansion joint in a curved ramp bridge under multidimensional seismic input[J].World Information On Earthquake Engineering,2012,28(1):39-43. |
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| Authors: | WANG Tianli LI Qingning GUO Xin |
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| Institution: | (Xi’an University of Architecture & Technology Dept of Civil engineering,Xi’an 710055,China) |
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| Abstract: | In view of the pounding damage of expansion joint in a curved bridge under earthquake,the Kelvin contact element was used to simulate the pounding between expansion joints.An independent single multi-unit long curved ramp bridge in a multilevel junction system was selected as a project example,and its space dynamic model was built.Using nonlinear time history analysis method,the different pounding responses of the bridge were analyzed under eight different types of seismic conditions those were in one-dimensional or multidimensional seismic input direction.The results show that the seismic response of a curved bridge in different directions is coupled.So the expansion joint seismic pounding response of a curved bridge should be analyzed including multidimensional seismic condition and evaluated with pounding force and pounding displacement simultaneously. |
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| Keywords: | curved ramp bridge pounding response of expansion joint nonlinear time history analysis method space dynamic model multidimensional seismic input coupling of seismic response |
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