二次预应力外包钢组合梁叠合楼盖动力特性有限元分析

二次预应力外包钢组合梁叠合楼盖结构体系是目前在外包钢组合梁和预应力结构理论研究基础上提出的新型楼盖体系。这种新型式的组合式叠合结构利用轻骨料混凝土大幅地减轻结构自重，增加楼盖体系保温隔热和隔音性能，同时通过两次预应力的张拉，使该新型楼盖系统适合了大跨度工程施工及承载，以及充分发挥各组合材料物理力学特性的要求，为该类型结构推广应用奠定了基础。论文采用有限元软件ANSYS建立叠合楼盖三维实体模型。对叠合楼盖的动力特性进行了分析，并通过改变预应力的大小、预应力筋的布筋形态和柱的约束条件等进行参数讨论。文中分析了各参数对结构体系自振频率及振幅产生的影响并得到了一些规律性的结论，对进一步研究该体系的动力性能有一定的指导意义。

FEA of dynamic characteristic of secondary prestressed outer-plated steel-concrete composite floor

The structural system of secondary prestressed outer-plated steel-concrete composite floor is a new type of floor system on the basis of the theoretical research of outer-plated steel-concrete composite beam and prestressed structure .This new type of composite structure using lightweight aggregate concrete greatly reduces the structural weight and increases the performance of heat insulation and sound insulation .At the same time , two times of the prestressed tension make the new floor system suitable for the large span construction and bearing , and make full use of the physical and mechanics properties of composite characteristics , which has laid the foundation for the popularization and application of this type of structure .Through the finite element software ANSYS , we establish three-dimensional solid model of laminated floor .FEA of dynamic characteristic of the laminated floor is presented and discussed by changing prestressed force and layout of tendons and constrained condition of columns .In this pa-per, the influence of the parameters on natural vibration frequencies and vibration mode are analyzed and some reg -ular conclusions drawn , which can provide some references for the further study on the dynamic performance of the system.