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多点激励下大跨度连续刚构桥地震响应振动台阵试验研究

ISSN号：1000-131X
期刊名称：《土木工程学报》
时间：0
分类：U442.5[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072, [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124
相关基金：国家重点基础研究发展“973”计划（2011CB013603）,国家自然科学基金（51021140003,90715032）

关键词：刚构桥, 多点激励, 振动台阵试验, 地震响应, 行波效应, 局部场地效应, rigid-framed bridge , multi-support excitations , shaking tables test , seismic response , traveling wave effect , local site effect

中文摘要：

目前对于大跨度桥梁在多维多点激励下的地震响应尚缺乏试验研究。以一高墩大跨度钢筋混凝土连续刚构桥工程为对象，按1／10比例设计和制作一座三跨刚构桥模型，并通过地震模拟振动台阵试验，研究一致激励、行波激励和局部场地效应等对刚构桥地震响应的影响。研究表明：刚构桥对地震动的频谱特性十分敏感，地震响应差异较大；行波效应增大桥墩变形和墩底应变，其影响程度随视波速和墩梁约束的不同而有差异，且桥墩墩底较墩梁固结处对行波效应更为敏感；局部场地效应增大桥墩变形和墩底应变，且其对中墩和边墩以及墩底和墩梁固结处的影响有所不同；同时考虑行波效应和局部场地效应，桥墩的动力响应较一致激励以及单独考虑行波效应和局部场地效应时有所增大。因此，在长大桥梁地震响应精细化分析中必须考虑地震动空间效应。

英文摘要：

Up to now, rare experimental researches focus on the seismic response of long-span bridges under multi- support earthquake excitation. A 1 ： 10 three-span continuous rigid framed bridge model is designed according to a practical long-span reinforced concrete bridge with high piers in order to carry out the corresponding shaking table tests. The uniform excitation, traveling wave effect, local site effect and the combination of the above two effects are considered in the experiment. The experimental results indicate that the continuous rigid framed bridge is sensitive to the spectrum ~ characteristics of the ground motions, and the seismic responses show great difference in various earthquake excitations. When the surface wave velocity is lower, the deformation of the pier and the strain at the bottom of the pier increase under the traveling wave excitation. The effect varies with the surface wave velocity and the constraint condition types, and the bottom of the pier is more sensitive to the traveling wave effect. If the local site effect is considered, the deformation of the pier and the strain at the bottom of the pier also increase, and the effect is different for the positions such as the middle-pier, the abutment, the bottom of the pier and the connections. When the traveling wave effect and local site effect is considered simultaneously, the dynamic responses of the pier are bigger than those under uniform excitation, solo action of the traveling wave effect or local site effect. Therefore, it is important to consider the effects of spatial variation of ground motion for the long-span bridges seismic analysis.

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