钢筋桁架混凝土楼板人致振动舒适度分析

Analysis of Human Induced Vibration Comfort of Reinforced Truss Concrete Slab

采用电动式激振器对钢筋桁架混凝土楼板进行简谐激振试验,以确定楼板在不同幅值不同频率简谐激励下的振动响应。利用ANSYS对试件进行建模分析,并与试验结果对比,验证有限元方法对钢筋桁架混凝土楼板进行动力分析的可行性。建立了人致激励下钢筋桁架混凝土双向板动力分析模型,分析了底部钢板、板厚(桁架高度)对楼板振动性能及舒适度的影响,并与同等规格的开口型压型钢板-混凝土组合楼板进行对比分析。结果表明:同等条件下,钢筋桁架混凝土楼板的基频较开口型组合楼板更高,在楼板中央施加人行激励时,钢筋桁架混凝土楼板振动加速度峰值比开口型组合楼板平均减小65.65%;拆除钢筋桁架楼承板的底部钢板后,钢筋桁架混凝土楼板的基频平均降低约4.37%,加速度峰值平均增加了约19.76%;且底部钢板厚度一定程度上影响了楼板的振动舒适度;楼板厚度的增加能显著提升钢筋桁架混凝土楼板和开口型压型钢板-混凝土组合楼板的振动舒适度。

The electric vibration exciter was used to perform simple harmonic excitation test on the reinforced truss concrete floor to determine the vibration response of the floor under different amplitude and frequency simple harmonic excitation. It used ANSYS to model and analyze the test piece, compared with the test results to verify the feasibility of the finite element method for dynamic analysis of reinforced concrete slabs. Then, a dynamic analysis model of reinforced truss concrete two-way slab under artificial excitation was established, and the influence of bottom steel plate and slab thickness(truss height) on the vibration performance and comfort of the floor was analyzed, and it was combined with the open profiled steel plate-concrete of the same specification.Comparative analysis of floor slabs shows that under the same conditions, the fundamental frequency of reinforced truss concrete floor slab is higher than that of open type composite floor. When pedestrian excitation is applied in the center of the floor slab, the peak vibration acceleration of reinforced truss concrete floor is reduced by an average of 65.65% than that of open type composite floor. After removing the bottom steel plate of the reinforced truss floor bearing slab, the fundamental frequency of the reinforced truss concrete floor is reduced by about 4.37% on average, and the peak acceleration increases by about 19.76% on average. And the thickness of the bottom steel plate also affects the vibration comfort of the floor slab to a certain extent. The increase in the thickness of the floor slab can significantly improve the vibration comfort of the reinforced truss concrete floor and the open profiled steel plate-concrete composite floor.