刚性吊杆拱桥主要受力构件冲击效应差异性  

Differences of impact effects on rigid arch-beam combinational bridge

作　　者：雷家艳[1] 崔怡观 周志成 王子豪 LEI Jiayan;CUI Yiguan;ZHOU Zhicheng;WANG Zihao(School of Architecture Civil Engineering,Xiamen University,Xiamen 361005,China;China Railway First Group Guangzhou Branch,Guangzhou 511400,China)

机构地区：[1]厦门大学建筑与土木工程学院,福建厦门361005 [2]中铁一局集团有限公司广州分公司,广东广州511400

出　　处：《厦门大学学报（自然科学版）》2022年第4期600-607,共8页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金(2020J01112193);福建省滨海土木工程数字仿真重点实验室开放基金;厦门市交通基础设施智能管养工程技术研究中心开放基金项目(TCIMI201806)。

摘　　要：拱梁组合体系桥梁以主梁、吊杆和拱肋构成上部结构,为分析此类桥梁各主要受力构件的冲击效应差异性,对复杂桥梁的结构设计及承载能力评估提供冲击效应分析的方法参考,依托厦门天圆大桥,建立精细三维车桥耦合振动体系的分离迭代法,开展拱梁组合体系主梁、拱肋、刚性吊杆构件的冲击效应数值计算,分析行车速度、路面不平度、不同车辆模型、车辆行驶的车道位置等因素对各主要构件冲击系数的影响,并利用结构实测应变数据计算实测冲击系数,验证数值计算结果的可靠性.研究表明,拱梁组合体系桥梁3种主要受力构件的冲击效应存在显著的差异性,且比按照规范依据桥梁基频计算的冲击系数大;拱桥刚性吊杆尤其是短吊杆冲击效应较大,在桥梁运营及维护中应重视其动力问题引起的结构安全问题.In this study,we aim to analyze differences of impact effects on arch-beam combinational bridges,and to provide suggestions for structure designs,bearing-capacity evaluations,and dynamic performance analyses of complex bridges.In reference to TianYuan Bridge in Xiamen,a detailed 3-D bridge model is established.A vehicle-bridge coupled vibration analysis is carried out by using the separated-iteration method to calculate impact factors of main structural members.Primary parameters including traveling speed,road roughness,different vehicle models,and vehicle passing lane are discussed in terms of impact effects of the girder,arch rib,and selected typical hangers in the arch bridge.Results show that the traveling speed and road roughness exert a greater influence to these impact factors in arch bridges than other two parameters do.In addition,significant differences exist among impact factors in the girders,arch ribs,and hanger members.For example,impact factors in hangers exceed those in girders and arch ribs.Finally,it should be emphasized that the impact effect on arch-beam combinational bridges deserves considerable research attention.

关 键 词：冲击效应 组合体系桥梁 拱桥 三维车桥耦合振动 动力测试 

分 类 号：TU448[建筑科学—岩土工程] U441[建筑科学—土工工程]