不同吊杆形式悬索桥人致振动分析及舒适度评价  

Human-induced vibration analysis and pedestrian comfort evaluation for suspension footbridge with different hunger systems

作　　者：张彦玲 王灿[1,2] 张旭 王昂洋[3] 李运生 Yan-ling ZHANG;Can WANG;Xu ZHANG;Ang-yang WANG;Yun-sheng LI(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;Cangzhou Power Supply Branch of State Grid Hebei Electric Power Co.,Ltd.,Cangzhou 061000,China)

机构地区：[1]石家庄铁道大学土木工程学院,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,石家庄050043 [3]国网河北省电力有限公司沧州市供电分公司,河北沧州061000

出　　处：《吉林大学学报（工学版）》2022年第11期2644-2652,共9页Journal of Jilin University:Engineering and Technology Edition

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

摘　　要：为研究结构细节对人行悬索桥人致振动响应及行人舒适度的影响,以某人行玻璃悬索桥为工程实例,分别建立了竖直吊杆模型和倾斜吊杆模型,分析了不同吊杆对自振特性和人致振动响应的影响,并基于德国EN03规范对行人舒适度进行了评估.结果表明:竖直吊杆模型横向及竖向基频均小于倾斜吊杆模型,但两种吊杆模型下该桥的振动频率均较低,说明结构整体柔性较大;两种吊杆模型中,计入人群质量后,各阶自振频率和主梁最大加速度均随行人密度的增加而减小;同一人流量下,主梁在对应不同模态的行人步频下加速度最大值均不同,但同一工况下倾斜吊杆模型的横弯和竖弯加速度数值均较竖直吊杆模型有所下降;两种吊杆模型的横向舒适度综合评价相同,竖向舒适度综合评价倾斜吊杆模型更优,倾斜吊杆可以有效加强改人行悬索桥的横向和竖向刚度。To research the influence of the structural details on the human-induced vibration and pedestrian comfort of the suspension footbridge,based on a practical suspension footbridge,two different structural models,one with vertical hanger system and the other with inclined hanger system,were built. The influence of different hanger systems on the free vibration and human-induced vibration were analyzed,and the pedestrian comfort was evaluated based on EN03 code. The results show that,the first-order vertical and lateral frequencies of the inclined hanger system model are lower than those of the vertical one,and both two hanger system model have low free vibration frequencies and corresponding high flexibility. When the pedestrian mass is considered,the free vibration frequencies and the maximum accelerator of the main girder under pedestrian load decrease with the increase of the pedestrian flow for both two models. Under the same pedestrian flow,the maximum accelerators according to different mode and free frequency are different,but the inclined hanger system model has lower lateral and vertical accelerators compared to the vertical one. The lateral comfort evaluation result is same for two models,but the vertical comfort evaluation is better for the inclined hanger system model. The inclined hangers can improve both the lateral and vertical rigidities of the suspension footbridge.

关 键 词：桥梁工程 人行悬索桥 自振特性 人致振动 行人舒适度 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]