基于舒适度性能的某大跨人行天桥风振控制研究  

Research on Wind Vibration Control of a Long-Span Pedestrian Bridge Based on Comfort Performance

作　　者：王奕涵 傅文炜 陈鑫[1] 谈丽华 Yihan Wang;Wenwei Fu;Xin Chen;Lihua Tan(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Yangtze River Delta Research Center of Smart Oasis,Zhejiang University,Jiaxing 314102,China;Zhongheng Design Group Co.,Ltd.,Suzhou 215123,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]浙江大学长三角智慧绿洲研究中心,浙江嘉兴314102 [3]中衡设计集团股份有限公司,江苏苏州215123

出　　处：《钢结构(中英文)》2024年第12期86-94,共9页Steel Construction(Chinese & English)

基　　金：国家自然科学基金项目(52178294,52408200);江苏省自然科学基金项目(BK20240996);苏州市科技计划项目(SYG202113,SJC2023002)

摘　　要：随着城市化进程的加速,大跨度人行天桥因其独特的结构形式和重要的建筑功能,逐渐成为现代城市基础设施的重要组成部分。然而,这类桥梁在风荷载作用下容易产生显著的风致振动,从而影响其结构的安全性和使用者的舒适度。为此开展了关于某大跨度人行天桥的风振控制研究,提出了基于舒适度性能的抗风设计方法。以苏州文博中心的飘带形人行天桥为案例,通过风洞试验和非线性时程分析,获取了大跨度人行天桥在不同风速和风向条件下的风荷载特征数据,并对其动力响应进行了系统分析,建立了一种以舒适度为基础的抗风性能设计框架,旨在通过优化结构设计与减振控制措施,提升人行桥的使用舒适性。研究中采用了多调谐质量阻尼器(MTMD)技术,针对结构的前3阶段主要振动模态实施有效控制。结果表明:在布置MTMD减振系统后,结构的加速度响应显著降低,减振效率超过了50%;在高风速条件下,竖向和横向的加速度峰值均满足相关规范要求。With growing urbanization,long-span pedestrian bridges have become an integral part of modern urban infrastructure due to their unique structural forms and essential architectural functions.However,such bridges are prone to significant wind-induced vibrations under wind loads,potentially compromising structural safety and user comfort.The wind-induced vibration control for a long-span pedestrian bridge was investigated,and a wind-resistant design method based on comfort performance was proposed.Using the ribbonlike pedestrian bridge of the Suzhou Cultural Expo Center as a case study,wind load characteristic data for the bridge under various wind speeds and directions were obtained from wind tunnel experiments and nonlinear time-history analysis,and its dynamic responses were also systematically analyzed.A comfort-based wind-resistance performance design framework was established to improve the comfort of the pedestrian bridge by optimizing structural design and vibration reduction measures.The study employed multi-tuned mass damper(MTMD)technology to effectively control the first three-ordor vibration modes of the structure.The results indicated that the acceleration response of the structure was significantly reduced with the MTMD system in the field,achieving a vibration reduction efficiency exceeding 50%.Under large wind speeds,the peak accelerations in both vertical and lateral directions met the requirements of relevant standards.

关 键 词：钢结构 大跨人行天桥 减振控制 MTMD 舒适度 性能设计 

分 类 号：U448.11[建筑科学—桥梁与隧道工程]