考虑人-结构耦合作用的室内大跨钢连廊振动舒适度分析

Vibration comfort analysis of an indoor large-span steel corridor considering human-structure coupling

大跨钢结构连廊质量小、结构柔、阻尼低,其动力特性及响应易受行人影响,为此围绕人-结构耦合作用对大跨钢连廊振动舒适度的影响开展研究。首先,引入两类单自由度人体动力模型,建立人-结构耦合动力模型,并确定人体模型关键参数。随后,基于课题组前期获取的谐波参数,模拟了单人步行荷载,进一步结合人群密度和步频关系,对大跨钢连廊的人群荷载进行了模拟。最后,以苏州文博中心观光连廊为例,对比分析了人-结构耦合作用对大跨钢连廊结构动力特性和振动响应的影响。结果表明,在考虑人-结构耦合作用后,结构的峰值加速度有一定程度减小,最大可达22.51%;人群的步行频率与结构的第1阶竖向自振频率接近或成倍频关系时易产生共振响应;人群密度的不同将影响行人步频,从而会导致对人-结构耦合作用效果的影响。

The dynamic characteristics and responses of long-span steel corridors are susceptible to pedestrians because of their small mass, flexibility and low damping. Therefore, analysis focuses on the influence of human-structure coupling on the vibration comfort of large-span corridors was carried out. Firstly, two types of single-degree-of-freedom human body dynamic models were introduced to establish the human-structure coupling dynamic model, and the critical parameters of the human body models were also determined. Subsequently, based on the harmonic parameters measured by the author′s research group in the early stage, the single pedestrian load was simulated, and then the crowd load of the large-span steel corridor was reproduced by introducing the relationship between the crowd density and the step frequency. Finally, taking the sightseeing corridor of Suzhou Culture and Expo Center as a case, the effects of human-structure coupling on the dynamic characteristics and vibration response of the large-span steel corridor were compared and analyzed. The results show that by introducing the human-structure coupling effect, the peak acceleration of the structure decreases with a maximum ratio of 22.51 %. When the walking frequency of the crowd is close to or multiplied by the first vertical vibration frequency of the structure, the resonance response will occur. The crow density will affect pedestrian frequency, and this will change the human-structure coupling effect.