摘要
为研究人致荷载中的随机性对多自由度空间索面独塔斜拉人行桥结构振动响应的影响,通过介绍人行荷载基本理论,对某环形桥面人行斜拉桥建立有限元分析模型,进行人致振动分析及舒适性评价。研究结果表明:基于德国人行桥设计EN03规范的CL2标准,第一阶模态在横向和纵向的加速度峰值均超过了舒适度标准,3个方向的振型位移均很大,纵向最大,竖向最小。对于环形桥面,纵向和横向加速度峰值会根据行人的朝向而发生改变,当行人的朝向背离主梁轴线方向时,此时理论分析的纵向加速度峰值1.29 m·s^(-2)为人体感受的横向加速度,为不可接受范围。为了使人致振动加速度响应峰值满足CL2舒适度标准,采用调谐质量阻尼器提高结构的阻尼比,并对减振方案进行数值仿真,按照最大加速度最小化原则设计TMD的基本参数。
To study the influences of the stochastic pedestrian loads on the vibration response of single-tower cable-stayed footbridge with multi-degree of freedom space cable plane,a finite element analysis model of a cable-stayed footbridge with circular deck by introducing the basic theory of pedestrian loads was established,and human-induced vibration analysis and comfort evaluation were conducted in this paper.The research results show that the peak transverse and longitudinal acceleration in the first mode exceeds the comfort standard according to the CL2 standard of EN03 code of German footbridge design,and the modal displacement in the three directions is large,with the maximum in the longitudinal direction and the minimum in the vertical direction.For annular bridge deck,the longitudinal and transverse accelerations will be changed with the orientation of pedestrians.When the orientation of pedestrians deviates from the axis of the main beam,the vertical peak acceleration of 1.29m/s^(2) at this time is actually the perceived transverse accelerations,which is unacceptable.In order to make the peak value of human-induced vibration acceleration response meet the CL2 comfort standard,a tuned mass damper(TMD)was used to improve the damping ratio of the structure,and the damping scheme was numerically simulated.The basic parameters of TMD were designed based on the maximum acceleration minimization which can provide a significate reference for similar bridges.
作者
胡嫄
曾武华
陈大汉
陈缔欣
何炫清
HU Yuan;ZENG Wuhua;CHEN Dahan;CHEN Dixin;HE Xuanqing(School of Civil Engineering and Architecture,Xiamen City University,Xiamen 361008,China;School of Architectural and Civil Engineering,Sanming University,Sanming 365004,China;Xiamen Municipal Engineering Design Institute Co.Ltd,Xiamen 361001,China)
出处
《三明学院学报》
2023年第3期117-124,共8页
Journal of Sanming University
基金
福建省科技厅自然科学基金面上项目(2020J01389)。
关键词
环形悬浮式桥面
独塔斜拉桥
人致振动
舒适性评价
加速度峰值
减振控制
circular deck
single tower cable stayed bridge
human induced vibration
comfort evaluation
peak acceleration
vibration reduction control
