人致激励下钢筋桁架叠合板振动舒适度评价

Vibration comfort evaluation of steel truss composite slab under human excitations

为了研究钢筋桁架叠合板的振动舒适度,对某高层住宅楼钢筋桁架叠合楼板进行了竖向振动响应试验和有限元分析。实测钢筋桁架叠合板在单人行走、三人行走、单人慢跑和三人慢跑这四个人致激励作用下的竖向振动响应,分析得到叠合板自振频率和人致激励下的峰值加速度。在验证有限元模拟结果准确性的基础上,分析叠合板边界条件对其自振频率的影响,并对比分析叠合板与现浇板的自振频率差异。结果表明:叠合板的自振频率和人致激励下的峰值加速度满足规范舒适度限值的要求;相同条件下,叠合板的自振频率在四边铰支边界条件下最大,在两短边铰支条件下最小;叠合板和现浇板的自振频率误差小于14%,两者舒适度差别不大。

In order to study the vibration comfort of steel truss composite slab,the vertical vibration response experiment and finite element analysis of steel truss composite slab of a high⁃rise residential building were carried out.The vertical vibration response of the steel truss composite slab under four human excitations of single person walking,three persons walking,single person jogging and three persons jogging were measured.The natural vibration frequency and peak acceleration of the composite slab under human excitations were gained.On the basis of verifying the accuracy of the finite element simulation results,the influence of the boundary conditions of the composite slab on its natural vibration frequency was analyzed,and the difference of natural vibration frequency between the composite slab and the cast⁃in⁃place slab was compared.The results indicate that the natural vibration frequency of the composite slab and the peak acceleration under human excitations meet the comfort limit value requirements of the code.Under the same conditions,the natural vibration frequency of the composite slab is the maximum under the boundary condition of four sides hinged support,and the minimum under the condition of two short sides hinged support.The error of natural vibration frequency between the composite slab and the cast⁃in⁃place slab is less than 14%,and there is little difference in comfort between the composite slab and the cast⁃in⁃place slab.