人致激励下钢楼梯加速度设计反应谱研究

A study on acceleration design response spectrum for steel stairs under pedestrian loads

人致激励下钢楼梯动力加速度反应是结构舒适度评价的重要指标,有必要建立可满足工程快速估算的实用方法。以某公共建筑的室内钢楼梯为工程背景,系统探讨了钢楼梯加速度设计反应谱的计算与拟合过程。选取不同教学楼、办公楼内共8部公共部位的钢楼梯,对行人上、下楼的步频进行实测统计。在标准激励系统动力方程基础上,采用Monte Carlo随机模拟方法拟合建立了可应用于工程快速估算的实用设计反应谱。以某室内钢楼梯为实测对象,进行了单人和多人工况下的反应谱方法估算与实测对比。结果表明,提出的人致激励下钢楼梯加速度设计反应谱方法适用于一般钢楼梯振动水平的估算。

Dynamic acceleration responses of steel stairs under pedestrian loads are important indicators of structural comfort evaluation.It is necessary to establish a practical method to realize rapid estimation in engineering.This paper explored the calculation and fitting process of acceleration design response spectrum for steel stairs by taking an internal steel staircase in a public building as background.Pedestrian pace frequencies were measured on eight steel stairs in different kinds of public buildings.The Monte Carlo simulation method was used to fit and establish practical design response spectrum on the basis of dynamic equation in a standard incentive system.An internal steel staircase was tested under different conditions.The measured results were used to compare with estimation results gained by using the response spectrum method.The comparison results demonstrate that the proposed method can be applied to vibration estimation of common steel stairs.