横梁长度参数对人行柔性吊桥抗倾覆的探讨分析  

Discussion on the Anti-overturning of the Length of the Beam on the Flexible Suspension Bridge

作　　者：莫靖 李睿[1] 岳俊欢 刘坤 MO Jing;LI Rui;YUE Junhuan;LIU Kun(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology Kunming 650500)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《工业安全与环保》2021年第7期51-54,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(51568029);云南省交通厅科技开发项目(云交科[2013]220-(2))。

摘　　要：人行柔性吊桥在人群偏载作用下,桥面系由于弯扭耦合作用,会产生桥面横坡,甚至倾覆现象。以云南某人行柔性吊桥为例,采用有限元软件建立全桥有限元模型,考虑在人群偏载的作用下,通过调试横梁的2个长度参数,包括横梁悬挑长度和空置长度(吊杆至边纵梁的距离),得到相应的桥面横坡并进行对比,找出合理的横梁长度参数设置体系,为今后人行柔性吊桥的设计提供参考。结果表明:在桥面净宽不变的前提下,适量增大横梁的空置长度,会使桥面横坡减小的效果更明显,桥面抗倾覆能力更强。Under the action of the eccentric load of the pedestrian,the bridge deck will produce lateral slope and even overturning due to the coupling of bending and torsion.In this paper,a flexible suspension bridge in Yunnan is taken as an example.The full-bridge finite element model is established by software.Under the action of the eccentric load of the crowd,the two length parameters of the beam are debugged,including the cantilever length and the vacant length of the beam(Distance from the boom to the side member).The distance to the side girders is obtained,and the corresponding lateral slope of the bridge deck is obtained and compared,and a reasonable parameter system for the length of the beam is found,which provides a reference for the design of the pedestrian flexible suspension bridge in the future.The results show that under the premise that the bridge deck has the same width,the proper increase of the vacant length of the beam will make the bridge lateral slope reduction effect more obvious,and the bridge deck anti-overturning ability is stronger.

关 键 词：人行柔性吊桥 偏载作用 抗倾覆 影响参数 

分 类 号：U441[建筑科学—桥梁与隧道工程]