大跨悬索桥主缆-吊杆-钢箱梁一体模型疲劳试验研究  

Fatigue Experimental Study on Integration Model Including Main Cable,Hangers and Box Main Girder of Long-span Suspension Bridge

作　　者：曾勇[1,2,3] 渠昱[1,3] 谭红梅[1,2,3] 顾安邦[1,3] 

机构地区：[1]重庆交通大学山区桥梁与隧道工程国家重点试验室培育基地,重庆400074 [2]重庆交通大学水利水运工程教育部重点试验室,重庆400074 [3]重庆交通大学山区桥梁结构与材料教育部工程研究中心,重庆400074

出　　处：《四川大学学报（工程科学版）》2016年第4期78-84,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51478071);交通运输部建设科技项目资助(2015318814190);山区桥梁与隧道工程国家重点试验室培育基地开放基金资助项目(CQSLBF-Y14-3;CQSLBF-Y16-10);国家留学基金资助项目(201308505149);山区桥梁结构与材料教育部工程研究中心开放基金资助项目(QLZX-2012-3;QLZX-2012-5);国家内河航道整治工程技术研究中心开放基金资助项目(SLK2013B04)

摘　　要：以往的悬索桥疲劳试验往往只针对索梁锚固区、正交异性钢桥面板和吊杆钢丝等钢桥的单一构件或部位,受边界条件影响较大,而一体化疲劳试验能够反应结构的整体疲劳性能。以某主跨788 m钢箱梁悬索桥为背景,为全面评估其主缆-吊杆-钢箱梁一体化结构关键构造细节的疲劳性能,验证其设计的合理性、安全性和耐久性,进行该桥1∶4缩尺的主缆-吊杆-钢箱梁一体化的模型疲劳试验研究。结果表明:在设计疲劳荷载作用下,实测位移与荷载大致呈线性关系,加/卸过程中位移有很好的对称性与可恢复性,应力重分布现象不明显;结构处于弹性工作阶段,该结构关键构造细节处均未发现疲劳裂纹,结构疲劳性能满足设计要求。通过一体化模型的疲劳试验研究,掌握了该结构的疲劳性能与传力规律,试验结果能反映主缆-吊杆-钢箱梁的实际抗疲劳性能,具有一定的工程参照意义。To evaluate the fatigue performance of the key structural details of a suspension bridge and verify the rationality of the design, safety and durability of the bridge, a 1 ： 4 scaled integration model fatigue test including main cables, anchorage zones, hangers and box girder was carried out. Experiment results showed that the stresses redistribution in the integrated model after fatigue loading is not obvious ,the principal stresses of static loads test during the fatigue experiment are small different and the relationship between displacement and load is approximately linear. Displacement and each static load test values in the process of loading and unloading has good syrnme- try and recoverability,which shows that the whole structure is in the elastic stage. Fatigue cracks are not found in the key structure de- tails the structure under the design of fatigue loading, so the structural fatigue performance meet the design requirements. Through the study of the fatigue experiment of integrated model structure ,the fatigue performance of the integrated model can reflect the actual fatigue performance of the cable-anchorage-hanger-girder structure, and the integrated fatigue experiment can provide some certain reference significance.

关 键 词：主缆-吊杆-钢箱梁 一体化 疲劳性能 悬索桥 疲劳开裂 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]