柔性人行悬索桥在不同结构参数下的动力特性研究  

Dynamic Behavior Study of Flexible Pedestrian Suspension Bridge with Different Structural Parameters

作　　者：李运生 薛辉[1,2] 张彦玲 Li Yunsheng;Xue Hui;Zhang Yanling(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2021年第2期10-15,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金青年项目(51908382,51778377);河北省自然科学基金青年项目(E2019210311);河北省自然科学基金(E2018210149)。

摘　　要：为研究新兴的人行玻璃悬索桥的动力特性,以某景区人行悬索桥为工程背景,利用Midas Civil 2019建立了三维有限元模型,在经过主缆找形、风缆找形、合并找形得到的成桥模型上通过多重Rite向量法进行了人行玻璃悬索桥的自振特性研究;然后用控制变量法从主缆直径、加劲梁布置形式、风缆预拉力及约束方式等方面进行了参数动力分析。结果表明,该人行悬索桥基频小,柔性大,但在人流正常通行时不会引起共振破坏;增大主缆直径可提高加劲梁的横弯及竖弯刚度,对加劲梁设置斜撑和加密横梁可提升其抗扭和抗弯刚度;适当增大风缆预拉力、采用三跨两铰和三跨连续约束对全桥刚度有提升作用。In order to study the dynamic characteristics of the new pedestrian suspension bridge,the 3D finite element model of a pedestrian suspension bridge in a scenic area was built by using Midas civil 2015.The completed model was obtained by the main cable shape finding,wind cable shape finding and combined shape finding,and then the natural vibration characteristics were analyzed by the multiple rite vector method.A parametric analysis was performed including the main cable diameter,the arrangement of stiffening beam,the pretension of the wind cable and the restraint conditions.The results show that,the pedestrian suspension bridge has a low first-order frequency and a high flexibility,but will not cause resonance damage under normal pedestrian load.Increasing the diameter of the main cable can improve the transverse and vertical bending rigidity of the stiffening beam;Diagonal brace and densified cross beam can improve its torsional and bending rigidity;Increasing the pretension of the wind cable and adopting three-span simply-supported stiffening beam or three-span continuous stiffening beam can improve the rigidity of the bridge.

关 键 词：悬索桥 人行 自振频率 振型 结构参数 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]