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结合钢-混凝土组合梁楼盖体系设计实例,选用MIDAS/Gen软件,分别针对施工阶段与使用阶段,建立了梁格模型、采用换算钢梁截面、虚拟楼板的梁板混合模型以及采用真实组合截面的梁板混合模型,并采用有限元软件进行了分析计算,应用有限元设计方法完成了该组合梁楼盖体系设计,并得出如下结论:1)梁格模型可以精确模拟施工阶段楼盖体系受力特征;2)采用换算钢梁截面、虚拟楼板的梁板混合模型可以准确得到使用阶段组合梁楼盖体系中各组合梁的内力分布情况;3)采用真实组合截面的梁板混合模型可以精确得到组合梁楼盖体系整体变形与自振特性;4)有限元建模设计方法为钢-混凝土组合梁楼盖体系设计提供了一种高效、精确、实用的途径。
Combined with the design example of the floor system of steel-concrete composite beam, the MIDAS / Gen software was selected to establish the model of the beam for the construction stage and the use stage respectively. The mixed beam-section model of steel beam section, virtual floor and real composite section The finite element method was used to analyze and calculate the floor slab system. Finite element method was used to design the floor system. The conclusions are as follows: 1) The grillage model can accurately simulate the construction of the floor system 2) The internal force distribution of each composite beam in the composite beam floor system can be accurately obtained by using the mixed beam and slab model of the section of the steel beam and the virtual floor; 3) The mixed beam and board model with the real composite section can Accurately obtain the deformation and natural vibration characteristics of the floor system of composite beams; 4) The method of finite element modeling design provides an efficient, accurate and practical way for the design of the floor system of steel-concrete composite beams.