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以某大悬挑钢箱梁为例,采用三维有限元,建立以顶板、底板、腹板及横隔板等单元件组成的空间仿真模型,研究了各个单元件的受力和变形特征。分析表明:大悬挑钢箱梁面板横向应力水平数倍于常规钢箱梁,在支撑附近横向应力与纵向应力一样都为控制性因素;三维仿真模型也可分析支座横隔板和挑臂等局部构件的应力;根据结构的受力特征可有效地进行结构优化调整。
Taking a large cantilevered steel box girder as an example, a three - dimensional finite element method is used to establish a space simulation model consisting of single roof, floor, web and diaphragm, and the force and deformation characteristics of each unit are studied. The analysis shows that the horizontal stress in the panel of large cantilevered steel box girder is several times that of the conventional steel box girder, and the horizontal stress and longitudinal stress in the vicinity of the brace are both controllable factors. The three-dimensional simulation model can also analyze the influence of the diaphragm and the arm And other local components of the stress; According to the structure of the force characteristics can effectively optimize the structure adjustment.