基于振动响应的钢筋桁架叠合板的舒适度研究

Study on comfort level of reinforced truss composite slabs based on vibration response

为了研究应用于住宅楼楼板的钢筋桁架叠合板的振动舒适度问题,通过试验研究了整体式连接钢筋桁架叠合板在人致激励荷载作用下的振动响应。试验设计了单人行走、3人不同步行走和3人同步行走3个荷载激励,并对单人行走荷载设计了纵向行走、横向行走和对角线行走3条路径,研究分析叠合板在不同人致激励下和行走路径的振动响应;同时建立叠合板精细化有限元模型,分析板底保护层厚度、桁架高度、混凝土与钢筋密度比和模量比对叠合板自振频率的影响。结果表明:人致激励下的峰值加速度沿层高的增大而增大,荷载工况的峰值加速度由大到小依次为3人同步行走、3人不同步行走、单人行走,单人行走下峰值加速度与行走路径无关;叠合板自振频率随板底保护层厚度的增大而减小,在桁架钢筋高度为80 mm达到最大,与混凝土和钢筋密度比成反比,与混凝土和钢筋模量比成正比。

To investigate the vibration comfort level of reinforced truss composite slabs applied in residential building floors,the vibration response of the integral connection reinforced truss composite slabs under human-induced excitation loads was studied through experiments.Three types of loading excitations,including single-person walking,three-person asynchronous walking,and three-person synchronous walking,were designed for experiments.For the single-person walking load experiment,three different walking paths including longitudinal,transverse,and diagonal were designed.The vibration response of the composite slabs under various human-induced excitations and walking paths was investigated.A refined finite element model of the composite slabs was established to analyze the influence of the protective layer thickness at the plate bottom,truss height,density ratio and modulus ratio of concrete to reinforcement on the natural frequency of vibration of the composite slabs.The results show that the peak acceleration under human-induced excitation increases with the layer height.The peak accelerations under different human-induced loading conditions decrease in the following order:three-person synchronous walking,three-person asynchronous walking,and single-person walking,and the peak acceleration under single-person walking condition is independent of the walking path.The natural frequency of the composite slabs decreases with the increase of the thickness of the protective layer at the plate bottom,and reaches the maximum when the truss height is 80 mm.The natural frequency is inversely proportional to the concrete-to-reinforcement density ratio,and is directly proportional to the concrete-to-reinforcement modulus ratio.