单人行走激励下楼板振动响应分析与舒适度评价

Analysis of Floor Slabs Vibration Response and Comfort Evaluation Under Single Person Walking Excitation

竖向振动峰值加速度是评价楼板结构振动舒适度的重要指标之一,基于瑞典钢结构协会规程中以冲量形式表示单人行走激励为基础,将楼板结构近似简化为单自由度体系,仅考虑瞬态反应时单人行走激励下楼板一阶竖向振动峰值加速度计算方法。以云南省昭通市某立体停车场为工程算例,采用现场实测和有限元分析得到2块典型楼板在单人行走激励下的竖向振动峰值加速度,同时运用理论计算公式得到竖向振动峰值加速度。对比实测值、有限元分析值及理论计算值,并采用我国规范相关规定对2块楼板进行舒适度评价。研究结果表明,该立体停车场2块楼板在单人行走激励下实测竖向振动峰值加速度分别为0.059,0.051m/s^(2),均不满足舒适度要求;由单自由度体系简化方法得到的楼板竖向振动峰值加速度与实测值和有限元分析值均吻合良好,且得到的舒适度评价结果一致。

The peak vertical vibration acceleration is one of the important indicators for evaluating the vibration comfort of floor slabs.Based on the impulse form of single person walking excitation in the Swedish Steel Structure Association regulations,this paper introduces a calculation method for the first-order vertical vibration peak acceleration of floor slabs,which approximates the floor slabs as a single degree of freedom system and only considers the transient response under single person walking excitation.Taking a three-dimensional parking lot in Zhaotong City,Yunnan Province as an engineering example,the peak vertical vibration acceleration of two typical floor slabs under single person walking excitation was obtained through on-site measurement and finite element analysis.At the same time,theoretical calculation formulas were used to obtain the peak vertical vibration acceleration.Compare the measured values,finite element analysis values and theoretical calculation values,and evaluate the comfort of the two floor slabs using relevant Chinese regulations.The research results show that the peak vertical vibration acceleration of the two floor slabs in the parking lot under the single person walking excitation is 0.059m/s^(2)and 0.051m/s^(2)respectively,which do not meet the comfort requirements.The peak vertical vibration acceleration of the floor slabs obtained by the simplified method of single degree of freedom system is in good agreement with the measured values and finite element analysis values,and the comfort evaluation results obtained are consistent.