摘要
楼板在人群行走振动下的加速度成为评价楼板结构适用性的重要指标。欧美规程对楼板振动问题采用单自由度的稳态响应分析方法,该方法过于简化,理论公式适用性不强。本文编制了可与有限元分析软件接口的人行荷载时程生成程序FVAP。基于多自由度楼板模型,实现人群行走致使楼板振动的时程分析方法,对特定边界条件、跨度及阻尼的楼板体系进行时程分析,并将计算结果与楼板人行荷载试验进行对比,表明该时程分析方法能较精确反映楼板人致振动的特性。本文还应用此方法对不同跨度、厚度及不同阻尼比的楼板结构进行算例分析,回归得出基于多自由度模型的楼板振动加速度反应谱计算公式。该公式适用于房屋建筑的楼板舒适度的评估,为实际工程中大跨度楼板的舒适度评估提出了具有工程意义的计算方法。
Occupant comfort, when large-span floor systems are subjected to crowd-induced vibrations, has become an important index to evaluate serviceability of structures. Harmonic vibration analysis procedure which takes floor system as a simply-supported single-degree of freedom system is introduced in European and American codes to deal with floor vibrations, which is oversimplified and inapplicable in many situations. This paper proposes a program FVAP （Floor Vibration Analysis Program） for the generation of load induced by human activities. Based on a multiple-degree of freedom model for floor vibration, the floor system with special boundary condition, span and damping is analyzed by time-history method which can be realized by an auto-interface for common finite element programs. Compared with the results of crowd-induced load experiment, the analytical results confirmed the accuracy of this analysis procedure in representing the characteristics of the crowd-induced floor vibrations. This method was applied to plenty of floor system analyses with different performance objectives, shapes and boundary conditions, and a formula of acceleration response spectra was obtained by regression method based on the multiple-degree of freedom model for the floor vibration. The research shows that the formula proposed in this paper is applicable for floor systems comfort evaluation of building structures and can offer a calculation method of considerable engineering significance for the comfort evaluation of the large span floor system in practical engineering
出处
《建筑科学》
北大核心
2009年第5期4-9,共6页
Building Science
关键词
楼板振动
时程分析
人行荷载仿真
加速度反应谱
floor vibrations
time-history analysis
crowd walking stimulation
acceleration response spectra
