大跨度连廊动力响应分析

Dynamic Response Analysis of Large Span Corridor

以西安火车站(改扩建)东配楼项目中的1幢办公及商业配楼中的大跨度连廊为例,采用时程分析方法对连廊结构进行了模态分析,分别研究了单人行走工况、人群连续行走工况、跑动荷载和随机人行工况作用下连廊结构的动力响应。研究结果表明:连廊结构的模态分布较为分散,第一阶竖向振动模态参与质量最大,起控制作用,高阶模态贡献少,竖向基频落入行人正常步频区间;在确定荷载作用和随机荷载作用时,连廊结构有较大概率存在舒适性问题,在不改变结构形式的情况下需要进行减振控制。研究成果为后续关于大跨结构人致激励的振动响应计算和减振设计研究奠定基础。

Taking a large span corridor in an office and commercial building of Xi'an Railway Station(reconstruction and expansion)east building project as an example,the modal analysis of the corridor structure is carried out by using time history analysis method.The dynamic response of the corridor structure under single person walking condition,crowd continuous walking condition,running load and radom pedestrian condition is studied respectively.The research results indicate that,the modal distribution of the corridor structure is relatively scattered;the first vertical vibration mode has the largest participation in the mass control,the contribution of higher order modes is less,and the vertical fundamental frequency falls into the normal step frequency range of pedestrians;when determining the load action and random load action,the corridor structure has a large probability of comfort problems,and so the vibration reduction control is needed without changing the structure form.The research results lay a foundation for the following research on the vibration response calculation and vibration reduction design of large span structures under human induced excitation.