冷弯薄壁型钢-稻草板组合楼盖抗振性能

为研究冷弯薄壁型钢-稻草板组合楼盖抗振性能,对2块单跨组合楼盖进行静载和动载试验,结果表明:在相同用钢量下,减少楼盖梁的数量、增加楼盖梁截面尺寸能有效提高组合楼盖的抗振性能;组合楼盖在1 kN静载作用下的跨中挠度均小于1.0 mm,动力荷载作用下自振频率均大于15 Hz,满足楼盖舒适度的要求。采用有限元软件ANSYS对试验模型进行数值分析,有限元计算结果与试验结果吻合较好。在此基础上,对楼盖跨度、楼盖梁间距和型钢厚度等因素进行参数分析,结果表明:增加组合楼盖边界条件、减小楼盖跨度等能有效地提高组合楼盖抗振性能。提出了该组合楼盖自振频率的简化计算公式,为其在工程中推广和应用提供依据。

Anti Vibration Performance of Cold-formed Thin-walled Steel-strawboard Composite Floor

In order to investigate the anti vibration performance of the cold-formed thin-walled steel strawboard composite floor,the vibration tests and 1 kN static load test of two single-span composite floors were carried out on.The results show that the anti vibration of the composite floor can be effectively improved by increasing the section size of beam and reducing the number of beams under the same steel amount.The mid-span deflection of the composite floor under the 1 kN static load is less than 1.0 mm,and the natural frequencies under the dynamic load are more than 15 Hz,which meets the requirements of the comfort of the composite floor.The test model was analyzed by ANSYS finite element software,and the finite element calculation results agree well with the test results.Furthermore,the parameter analysis of the verified finite element model was carried out.The anti vibration performance of the composite floor can be effectively improved by increasing the boundary constraints of the composite floor and reducing the span of the composite floor.The calculation method of static deflection and natural vibration frequency of the composite floor is put forward,which provides a reference for engineering design.