大跨度U形钢-混凝土组合空腹夹层板楼盖舒适度实测分析

Measurement and analysis of comfortableness of large-span U-shaped steel-concrete composite hollow sandwich floor

以贵州省博物馆红军长征馆为例,利用环境激励,采用频域法模态拟合方法对该大跨度u形钢.混凝土组合空腹夹层板楼盖进行了现场竖向振动模态测试和人员作用下的舒适度分析,得到了该楼盖结构前6阶竖向自振频率、振型、竖向加速度时程曲线以及实测加速度的最大值,采用有限元分析方法对实测自振频率和振型进行了对比分析。分析结果表明:模态分析中楼盖竖向第1阶自振频率的有限元分析结果和实测结果均满足现行规范要求;舒适度分析中楼盖竖向峰值加速度实测结果满足规范小于0.005g的要求,不会引起人员不适;由于隔墙和约束的原因导致有限元分析结果与实测结果不一样,但是相差大小在正常范围内。

Taking the Red Army Long March Project of Guizhou Museum as an example, frequency domain modal fitting method was used to conduct field vertical vibration modal test and comfortableness analysis of the large-span U-shaped steel-concrete composite hollow sandwich floor by using environmental excitation and human action. The first six orders of vertical natural frequencies, vibration modes, vertical acceleration time-history curves and the maximum measured accelerations were obtained. The finite element analysis method was used to compare and analyze the measured natural vibration frequency and vibration mode. Analysis results show that the finite element analysis results and measured results of the vertical 1 st-order vibration frequency of the floor in the modal analysis meet the requirements of the current specification; in the comfortableness analysis, the measured results of vertical peak acceleration of the floor meet the specification requirements of less than 0.005g, which will not cause non-comfortableness; due to the partition wall and constraints, finite element analysis results are different from the measured results, but the difference is within normal range.