索-混凝土板预应力组合网架静力特性分析

Static analysis of pre-stressing combined nets that contains cables and concrete slab

将网架上弦用混凝土板代替,下弦用预应力索代替,形成上弦为板、下弦为索的预应力组合网架。利用ANSYS有限元软件建立该结构的模型并分析其静力特性,其中建立模型时将结构离散成板单元、梁单元、杆单元和索单元,各单元之间通过节点彼此相连。经过分析可知结构的节点位移中心处最大,往四周逐渐减小;板肋既有受拉又有受压的单元,腹杆既有拉杆又有压杆,并且拉压单元和拉压杆件交替出现;索终应力值全部为拉应力。

It presented a kind of nets forms, whose top boom was replaced by concrete slab and the bottom chord bar was replaced by pre - stressed cables. Structure model was framed and the structure＇ s static characteristics were analyzed with ANSYS finite element software. When model was found, the structure was dispersed with slab elements, beam elements, pole elements and cable elements. And these elements interconnected with nodes while framing structure model. The conclusion is that the node displacement reaches the largest value in the center of the structure. And the node position is farther away from the center, the less of the node displacements.Also some plate elements have tension and others have pressure, so as the belly bars. The tension and pressure elements＇ positions are alternative. When the structure is forced by prestress and external load, the cables have tension.