摘要
针对室外观景平台在人行致振下的舒适度问题,通过系统梳理国内外类似工程的舒适度评价方法与标准,给出了以自振频率及加速度响应为评价指标的参考数值和分析方法,归纳出观景平台舒适度分析与评价的6个基本步骤;对某大悬挑钢结构观景平台工程,首先通过自振频率分析初步评估,发现其竖向振动频率未满足舒适度要求,进一步采用竖向加速度响应进行评估,设计了观景平台的三种交通级别和对应的舒适度等级,确定了各交通等级对应的人致加载模式,采用加速度响应作为控制指标进行舒适度评价,对不满足舒适度要求的情况制定了设置反向拉索、增大结构刚度与设置TMD三种减振控振方案。三种方案均有效控制了该观景平台的竖向加速度响应,其中设置反向拉索的减振控振方案效率最高,减振效率达78%;增大结构刚度的方案其减振效率为54%,但成本较高;设置TMD的减振控振方案不仅减振效率高,且在材料、施工等成本方面与工程预算协调度更好,采用1 t质量块就能达到79%的减振效率。
Aiming at the comfort problem of outdoor viewing platform under pedestrian vibration,this paper reviews the comfort level evaluation methods and standards of similar projects at home and abroad,presents the reference value and analysis method of natural vibration frequency and acceleration response as the evaluation index of viewing platform,and summarizes six basic steps of viewing platform comfort level analysis and evaluation.In the engineering practice of a large cantilevered steel structure viewing platform,the natural vibration frequency was first used to evaluate the vertical vibration frequency of the platform,revealing that the platform did not meet the comfort requirements.The vertical acceleration response was further used to evaluate,three traffic levels and corresponding comfort levels of the viewing platform were designed,and the corresponding human-induced loading modes for each traffic level were formulated.Acceleration response was used as the control index to evaluate the comfort level.For cases that did not meet the comfort level requirements,three vibration reduction and control schemes,namely reverse cable,increasing structural stiffness and tuned mass dampers(TMD),were developed.The three schemes all effectively controlled the vertical acceleration response of the viewing platform,among which the reverse cable had the highest efficiency and the vibration reduction efficiency reached 78%.The vibration reduction efficiency of the method of increasing structural stiffness was 54%,but the cost was high.The vibration reduction efficiency of TMD was well coordinated with the cost,and the vibration reduction efficiency of a 1.0 tons mass block can reach 79%.
作者
梅世强
刘毅
王焜
罗杰
李碧远
MEI Shiqiang;LIU Yi;WANG Kun;LUO Jie;LI Biyuan(YCIH Steel Structure Co.,Ltd.,Kunming 650501,China)
出处
《建筑钢结构进展》
北大核心
2025年第9期110-120,共11页
Progress in Steel Building Structures
关键词
室外观景平台
舒适度评价标准
人行致振
交通级别
舒适度等级
减振控振
outdoor viewing platform
comfort evaluation standard
human-induced vibration
traffic level
comfort level
vibration reduction and control
