自锚式悬索桥断索动力冲击效应模型试验研究  

Model testing research of impact effect on self-anchored suspension bridge subjected to hangers fracture

作　　者：叶毅[1,2] 任阳阳 邓余杰 陈鹏飞 郭琦 YE Yi;REN Yangyang;DENG Yujie;CHEN Pengfei;GUO Qi(a.School of Civil Engineering,Ministry of Education(XAUAT),Xi'an University of Architecture&Technology,Xi'an 710055,P.R.China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi'an University of Architecture&Technology,Xi'an 710055,P.R.China;Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou 310051,P.R.China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055 [3]浙江交工集团股份有限公司,杭州310051

出　　处：《土木与环境工程学报（中英文）》2022年第3期1-9,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51508453);陕西省教育厅科研计划(14JK1418)。

摘　　要：为探讨自锚式悬索桥在吊索瞬时破断作用下的动力冲击效应,以某在役自锚式悬索桥为背景,基于刚度相似理论建立1∶80的缩尺试验模型,进行不同区段内吊索的断索动力冲击效应模型试验。试验结果表明:不同区段吊索破断引起的冲击效应不同;断索会引起与破断吊索同侧同跨的相邻吊索区域内的动态内力重分布且动力冲击效应明显;与瞬断吊索紧邻的两根吊索中,较长吊索的动力冲击系数(DIF)和动力放大系数(DAF)均较大,其动力冲击效应和冲击作用敏感性更高;瞬断工况下的吊索拉力动态响应峰值较断索前普遍达到2倍以上,吊索的安全储备明显较低。相邻吊索在断索作用下的动力冲击效应显著,若相邻吊索存在腐蚀等缺陷,极易导致桥梁连续性断索,严重影响桥梁安全。In order to examine the dynamic impact effect of the self-anchored suspension bridge subjected to hangers fracture,model test for suspension hangers fracture was carried out.A 1∶80 test model was developed based on the stiffness similarity theory.The test results indicate:the dynamic impact effects of hangers fracture in different regions are dissimilar.The tensile forces of the adjacent hangers on the same-side and same-span are dynamically redistributed after hangers fracture.Compared with shorter hanger that is adjacent to the broken suspension hanger,the Dynamic Impact Factor(DIF)and the Dynamic Amplification Factor(DAF)of the longer one is greater.The dynamic impact effect is obvious and dynamic impact sensitivity is higher.The peak values of dynamic tension forces of the hangers would be more than twice of the original values generally,and the safety reserve is obviously reduced.The dynamic impact effects of hangers fracture is significant,and it will lead to continuous hangers fracture easily on occurrence of corrosion or other defects of the adjacent hangers and affects the safety of bridges seriously.

关 键 词：自锚式悬索桥 缩尺模型试验 吊索瞬断 动力冲击效应 桥梁安全 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]