人与轻柔结构水平相互作用试验研究

针对人-结构系统水平振动问题,建立了人-结构水平振动试验平台;在结构轻质低基频情况下,研究了人-结构系统水平振动特性。试验表明:当人自然站在结构上时,前后向人体使结构的基频降低,但与重量相当的质量块-结构系统相比,降低幅度相对较小;左右向人体既可以使结构基频降低,也可以使结构基频升高;前后向人体对结构基频的影响量大于左右向人体对结构基频的影响量;质量块对结构的振型阻尼比影响很小,人体能显著增大结构振型阻尼比;但前后向人体贡献的阻尼比左右向人体贡献的阻尼大。在水平向,自然站立的人不能当做质量块。

Experiment Investigation of Human-gentle structure interaction in lateral directions

A test platform was designed for researching the question of human-structure vibration in lateral directions purpose. The vibration of the system of human-structure in lateral direction was studied,when the structure was soft and has a low nature frequency. An impact was applied on structure in the lateral directions when it was empty and when an individual stood on the structure and when a mass block was put on the structure. It was observed consistently from the measurements that the human body (in front and back direction) and mass block could low the nature frequency of the structure. However the human body(in right and left direction)could both low and raise the nature frequency of the structure. but the nature frequency of mass block-structure was much lower than the nature frequency of human-structure. The effect to the nature frequency of the structure was caused by the human body(in front and back direction) was bigger than the human body(in right and left direction). The effect to the damping ratio was cause by mass block was almost unchanged; However the human body could raise the damping ratio significantly. But the effect to the damping ratio was cause by the human body(in front and back direction) was bigger than the human body(in right and left direction).These observations clearly indicated that a standing body could not act as a mass.