文献类型：期刊文献

中文题名：山区跨河人行钢索吊桥水毁破坏机理研究

英文题名：Research on Failure Mechanism of Flood Damage to Pedestrian Steel Cable Suspension Bridges Across Rivers in Mountainous Areas

作者：吴安杰 武艺

第一作者：吴安杰

机构：[1]贵州理工学院土木工程学院,贵州贵阳550003;[2]贵阳信息科技学院土木工程系,贵州贵阳550025

第一机构：贵州理工学院土木工程学院

年份：2025

卷号：42

期号：1

起止页码：69-78

中文期刊名：贵州大学学报(自然科学版)

外文期刊名：Journal of Guizhou University:Natural Sciences

基金：贵州省科技计划基础研究资助项目(黔科合基础[2020]1Y248);贵州理工学院高层次人才启动基金资助项目(XJGC20190908)。

语种：中文

中文关键词：钢索桥;洪水作用;有限元分析;破坏机理

外文关键词：steel cable bridge;flood action;finite element analysis;failure mechanism

摘要：以2020年贵州省榕江县“7·10”便民吊桥水毁为工程背景,对山区人行钢索吊桥水毁机理进行研究。基于暴雨洪水法推求了受灾河段(平永河)设计洪水量,通过现场勘测,复核了此次洪峰流量;采用有限元软件建立了吊桥几何非线性计算模型,对洪水作用下桥梁受力进行分析,并结合桥梁水毁实况视频,研究了该桥水毁机理。结果表明:本次暴雨洪水重现期超1000年一遇,汇流条件属于部分汇流类型;当洪水漫过桥面,洪水水平力、上托力及扭矩会使桥梁产生较大响应,最大洪峰流速5 m/s时,索力相比成桥索力可增加8倍,桥塔应力相比成桥应力可增加约9倍,桥塔倾覆前桥面位移可达2.3 m;桥梁上游侧地索绷断的临界水流速度为3.92 m/s,南侧索塔(靠银榕公路侧)在最大洪峰流速时,抗滑动和抗倾覆稳定系数均小于1;洪水流量过大、桥塔基础埋深浅和缺乏有效的侧向抗风索是造成吊桥破坏的重要原因。为减少水毁事故发生,应保证此类吊桥基础稳定和具有足够的净空,并设置必要的抗风索。
To study the mechanism of flood failure to pedestrian steel cable suspension bridges in mountainous areas,taking the"7·10"convenient suspension bridge water damage in Rongjiang County in 2020,Guizhou Province as the engineering background,the design flood discharge of the bridge site located in Pingyong River was calculated based on the rainstorm flood method,and this peak discharge was rechecked through field survey.A geometric nonlinear calculation model for the suspension bridge was established using finite element software,and the response of bridges subjected to flood action was analyzed.The mechanism of bridge disaster by flood was studied combined with the video recording.The research results show that the return period of this rainstorm flood exceeds 1000 years,and the confluence condition belongs to a partial confluence type.When the flood overflows the bridge deck,the horizontal force,uplift force,and torque of the flood action will cause a significant response of the bridge.At the maximum peak flow velocity(5 m/s),the cable force can increase by 8 times compared to the accomplishment state of the bridge,the stress of the bridge tower can increase by about 9 times,and the displacement of the bridge deck before the bridge tower capsizes can reach 2.3 m.The critical water flow velocity for the breakage of the cable located on the upstream side of the bridge deck bottom is 3.92 m/s,and the stability coefficients for anti sliding and anti overturning of the cable tower on the south side(near the Yinrong Highway)are both less than 1 at the maximum flood peak flow velocity.Excessive flood discharge,shallow burial depth of bridge tower foundations,and lack of effective lateral wind resistant cables are important reasons for the damage of suspension bridges.To reduce bridge disaster by flood,it is necessary to ensure the stability of such suspension bridge foundations and have sufficient clearance and necessary wind resistant cables.