基于人群行走仿真的楼板振动分析方法及反应谱公式推导

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.

Research on Analysis Method for Floor Vibration and Formula Derivation of Response Spectra Based on Simulation of Crowd Walking

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 indu...