单根吊杆断裂对系杆拱桥吊杆内力重分布的影响研究  

Study on the influence of single hanger fracture on the internal force redistribution of the tied arch bridge

作　　者：于博 张戎令[1,2] 毕来运 张新博 吕文达 党理国 YU Bo;ZHANG Rongling;BI Laiyun;ZHANG Xinbo;LU Wenda;DANG Liguo(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070;Key Laboratory of Road&Bridges and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;Jinan Design Institute of China Railway Engineering Design Consulting Group Co,Ltd.,Jinan 250000,China;Lanzhou Railway Design Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [3]中铁工程设计咨询集团有限公司济南设计院,山东济南250000 [4]兰州铁道设计院有限公司,甘肃兰州730000

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第6期889-894,904,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：长江学者和创新团队发展计划滚动支持基金资助项目(IRT_15R29);国家自然科学基金资助项目(51768033);甘肃省教育厅高等学校科研基金资助项目(2018B-054)。

摘　　要：以实际一系杆拱桥为研究背景,依据相似原理,考虑几何相似、荷载相似和材料相似的要求,浇筑1∶16的室内缩尺模型,对典型位置单根吊杆断裂致使其余吊杆内力重分布的影响进行定量计算.结果表明:当某一吊杆发生断裂后对同侧拱肋相邻吊杆影响较大,与断裂吊杆相邻吊杆应力增大约25%;结构跨中、拱脚及四分点位置处吊杆断裂后对其余吊杆影响较大,位于拱脚处短吊杆对剩余吊杆的内力重分布影响最为明显;计算结果为同类实际桥梁的管理及日常养护提供了参考,对实际结构的设计、施工,特别是运营维护具有重要的参考价值.Based on the actual research of the tied arch bridge,the similarity principle,the geometric similarity,load similarity and material similarity requirements,with the indoor scale model of 1:16 is poured,this essay aims to analyze and calculate the impact on fracture of a single hanger to the other hangers at the typical position.Results show that the impact on the adjacent hanger of the same side arch rib is greater when a certain hanger is broken,and the stress of the hanger adjacent to the broken hanger increased by around 25%.At the position of the midspan,arch springing and one fourth of structure,the hanger has a slightly greater influence on other hangers.The hanger at the arch springing has the most obvious influence on the internal force redistribution of the remaining hangers.However,the single hanger fracture generally does not cause the chain reaction of other fractures of hangers.The laboratory bridge model is based on the simulation of influence of the actual bridge type on the internal force redistribution of the tied arch bridge after the single hanger breaks.Calculation results provide reference for the management and daily maintenance of actual bridges,which also has guiding significance for on-site construction.

关 键 词：系杆拱桥 相似理论 有限元模拟 吊杆断裂 内力重分布 

分 类 号：U448.22+5[建筑科学—桥梁与隧道工程]