摘要
大跨度轻柔结构在步行荷载作用下容易出现振动舒适度问题,研究步行荷载的特性并建立合理的荷载模型是准确预测人致结构振动的前提。首先收集了刚性表面上单人三向连续步行荷载的实测时程数据,相关分析表明步行荷载三向分量之间的相关性较弱。据此,在周期性假定的基础上分别建立了步行荷载三个方向上的傅里叶级数模型,由实测数据统计分析获得了模型参数与步行频率、步行速度间的函数关系。与各单向上的已有荷载模型的对比表明,不同模型间表现出一定的差异,建议模型可供工程结构人致振动分析参考使用。
A large-span flexible structure is easy to have the vibration serviceability problem under pedestrian walking load. Studying characteristics of walking load and establishing a reasonable load model are prerequisites for accurate prediction of human-induced structural vibration. Here, firstly, the measured time histories of individual 3-D continuous walking load on rigid surfaces were collected. Correlation analysis showed that the correlation among three components of human walking load is weaker. Accordingly, Fourier series models for three components were built, respectively based on the assumption of periodicity. The function relations among model parameters, walking frequency and walking speed were derived using the statistical analysis of measured data. Compared with existing load models in a single direction, the results showed that there are certain differences among different models;the proposed load models provide a reference for human-induced vibration analysis of engineering structures.
作者
赵丁苏
陈隽
ZHAO Dingsu;CHEN Jun(College of Civil Engineering, Tongji University, Shanghai 200092, China;State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第11期166-172,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51778465)
