摘要
针对某大跨度连廊结构的楼盖舒适度问题,建立了连廊的整体有限元模型,采用Ritz向量法对结构进行了模态分析,研究了大跨度连廊结构的振动特性并进行减振设计。根据不同的人群密度和行走频率,研究了四种人群荷载激励下楼盖的竖向振动情况,对比设置调频质量阻尼器(TMD)前后连廊结构的竖向加速度。结果表明,连廊的自振频率接近于人行频率,在人行荷载的激励下,连廊发生共振现象,形成较大振动,造成人体不适,故需控制振动;在连廊的合理位置设置TMD后,整体减振率达67.4%,楼盖振动满足人体舒适度要求,说明TMD起到了良好的减振作用。
Aiming at the floor comfort of the long-span corridor structure,the comprehensive finite element model of the corridor is established,and the modal analysis of the structure is carried out by Ritz vector method.The vibration characteristics of the long-span corridor structure are studied and the vibration reduction design is analyzed.According to different crowd densities and walking frequencies,the vertical vibrations of the floor under four kinds of crowd loading are studied,and the vertical accelerations of the corridor structure before and after TMD installation are compared.The results indicate that the natural vibration frequency of the corridor is close to the walking frequency.Under the excitation of random pedestrian loads,the corridor exhibits resonance,leading to significant vibrations that can cause discomfort to occupants.Hence,it is necessary to implement measures to control and mitigate vibrations.By setting TMD in a reasonable position of the corridor,the overall vibration reduction rate is as high as 67.4%.The vibration of the floor can meet the human comfort requirements,which indicates that TMD plays an effective role in vibration regulation.
作者
樊亭
张春文
胡显昊
吕一敏
李君艳
吴志峰
FAN Ting;ZHANG Chunwen;HU Xianhao;LÜYimin;LI Junyan;WU Zhifeng(United Design Group Co.,Ltd.,Wuhan 430000,China;Wuhan University of Technology,School of Civil Engineering and Architecture,Wuhan 430070,China;Huazhong University of Science and Technology,School of Civil and Hydraulic Engineering,Wuhan 430074,China)
出处
《结构工程师》
2024年第5期28-35,共8页
Structural Engineers
基金
国家自然科学基金面上项目(51978545)。
关键词
大跨度连廊
调频质量阻尼器
振动控制
人致振动
人体舒适度
large-span corridor
tuned mass damper
vibration control
human-induced vibration
human comfort
