预应力钢-混凝土组合双向楼板空间受力.PDFVIP

预应力钢 - 混凝土组合双向楼板空间受力 的非线性有限元分析 陆新征 　江见鲸 (清华大学 土木工程系 　北京 　100084) 　　摘 　要 : 预应力钢 - 混凝土组合梁具有刚度大、承载力高、延性好等特点 , 因而得到越来越广泛的应用。 如将组合梁在平面交叉组成双向楼板体系 ,预期可以进一步提高其刚度和承载力。为此 ,利用非线性有限元 方法 ,对预应力钢 - 混凝土组合单向楼板和双向楼板进行了空间受力全过程分析 ,并通过改变预应力筋配置 进行了参数讨论。分析结果表明 ,相对于钢 - 混凝土组合单向楼板 ,组合双向楼板的承载力可以提高 133 % , 刚度可以提高 66 % 。而施加预应力后 ,刚度和承载力还可以继续提高。钢 - 混凝土组合双向楼板是一种非 常有前途的结构形式。 　　关键词 : 组合结构 　双向楼板 　预应力 　非线性有限元 SPATIAL ANALYSIS OF PRESTRESSED STEELCONCRETE COMPOSITE TWOWAY SLAB WITH NONLINEAR FINITE ELEMENT METHOD Lu Xinzheng 　Jiang Jianjing (Department of Civil Engineering ,Tsinghua University　Beijing 　100084) Abstract : Prestressed steelconcrete composite beams have the advantages of large stiffness , high strength and good ductility. And the stiffness and strength of slab can be improved much more if letting the composite beams cross each other to buildup twoway slab. The composite beams are placed under the concrete in oneway or twoway respectively to compare the difference. The place of installing the prestressed cables is also discussed in this paper. The numerical results show that the strength of twoway composite slab can be improved by 133 % ,while the stiffness can be improved by 66 % ,which are compared with the oneway slabs. And the strength and stiffness can be improved further if the prestressed cables are installed. It shows that the twoway composite slab is a new structure with a bright future. Keywords : composite structure 　twoway slab 　prestress 　nonlinear finite element 　　钢 - 混凝土组合梁具有强度大、承载力高、延性好等优 中 ,将钢筋分布于整个单元中 ,并把单元视为连续均匀材料 , 点[1 ] ,如在组合梁上施加预应