空腹夹层板的自振特性分析

Analysis on Natural Vibration Characteristic of Open-Web Sandwich Plate

对于钢筋混凝土空腹夹层板楼盖,采用8节点弹性块体有限元方法在点支承条件下进行了30个算例的自由振动分析,结果表明,空腹夹层板的振型与同等支承条件的实心平板类似;增加结构的总厚度可以有效提高结构刚度;表层薄板厚度对结构各阶频率的影响不大,建议表层薄板厚度不大于网格尺寸的1/25;由于质量和刚度对基频的影响是关联的,肋高和网格尺寸不是影响结构基频的决定因素。本文结论对以后工程的设计具有一定的参考价值。

Elastic solid finite element method was useu Openweb sandwich plate under the point support. The result shows that the modes of Openweb sandwich plate is similar with solid plate under the same conditions ; To increase the total thickness of the structure can effective ly improve the structural stiffness; Sheet thickness on the surface structure has little effect on the frequency of each order, so proposed skin sheet thickness could not be greater than the 1/25 of mesh size; Since the mass and stiffness of the base frequency effects are associated, rib height and mesh size are not determinants that affect the structural fundamental frequency. Conclusions have a certain reference value on future project design.