摘要
人致荷载作用下,大跨度人行桥、连廊和楼盖等结构易产生过量振动,引发舒适度问题,现行规范给出的静力挠度控制不能充分解决这一问题。利用人群荷载的功率谱密度分布求得均方根加速度响应;结合烦恼率模型,建立了评价大跨度结构的人致振动舒适度的生命周期费用模型;以位于上海地区的某大跨度悬挑楼盖为对象,采用生命周期费用模型计算不同设计方案下结构的生命周期费用,对该大跨度楼盖是否安装多重调频质量阻尼器(MTMD)进行了投资决策,说明了本模型的有效性。
The vibrations of long-span structures such as pedestrian bridges,corridors and floors are excessive under pedestrian excitation,which may cause human discomfort.However this problem can not be sufficiently solved by checking static deflection which is required by current design codes.The mean square root acceleration response was obtained by using the power spectral density distribution of the crowd load.Combined with annoyance rate model,the life-cycle cost model is established to evaluate the comfort level of human-induced vibration of large-span structure.Taking a large-span cantilevered floor located in Shanghai area as an example,the life-cycle cost model was used to calculate the life-cycle cost of the structure under different design schemes.An investment decision is made on whether to install MTMD in the large-span floor,which shows the effectiveness of the model.
作者
何斌
刘成清
盛涛
He Bin;Liu Chengqing;Sheng Tao(College of Civil Engineering,Kashgar University,Kashgar 844008,China;College of Civil Engineering,Southwest Jiaotong University,Chendou 610031,China;Faculty of Architectural,Civil Engineering And Environment,Ningbo University,Ningbo 315211,China)
出处
《建筑结构》
CSCD
北大核心
2019年第A01期333-338,共6页
Building Structure
基金
喀什大学校内课题资助((15)1555)
