关键词: 钢管混凝土拱, 非线性, 纤维模型, 横向荷载

Abstract: Through nonlinear analysis concrete filled steel tubular arches' mechanical property was researched. The appropriate constitutive equation was selected. Flexibilitybased nonlinear beamcolumn element was used. The calculation formulae of the fiber model were deduced. The mechanical researches show that lateral loads acts more influence on lateral deformation than vertical deformation. The influence of lateral loads on vertical deformation is presented at last loading stage, while the influence on lateral deformation is presented throughout the entire loading history. The lateral loads decreases the ultimate loading capacity of arches significantly. When the lateral load is equal to the 50% of vertical load, the ultimate loading capacity of arches lost 50%. Lateral loads at mid span put more influence on lateral deformation than that at 1/4 span. It is concluded that influence of lateral load on the arch bridges must be considered fully during the design of arch bridges.

Key words: tubular arches, nonlinear, fiber model, lateral load