波形钢腹板-混凝土组合箱拱面内受力全过程试验研究

EXPERIMENTAL RESEARCH ON IN-PLANE BEHAVIORS OF BOX ARCH WITH CORRUGATED STEEL WEBS AND CONCRETE FLANGES

波形钢腹板-混凝土组合箱拱是一种新型的组合拱结构。进行了该组合拱模型的面内两点非对称加载试验。建立了考虑材料与几何双重非线性的有限元模型,对模型拱面内受力全过程进行了分析,有限元计算结果与试验结果吻合良好。研究表明,波形钢腹板-混凝土组合模型拱在弹性阶段的截面纵向应变满足"拟平截面假定",挠度计算中需考虑波形钢腹板剪切变形的影响。与平钢腹板-混凝土组合箱拱、混凝土箱拱的破坏机理进行了比较,提出波形钢腹板-混凝土组合箱拱极限承载力的简化计算方法。

A composite box arch with corrugated steel webs and concrete flanges is a new type of arch structures.The experiment of this new composite box arch model under asymmetrically in-plane loading is carried out.A FE model is established and its dual nonlinear behavior in the whole process is analyzed.The FE analysis result achieves good agreement with that of the experiment.Research results show that the longitudinal strain of model arch meets the assumption of Quasi-Plane-Section in the elastic stage and the effect of shear deformation should be taken into account in the calculation of its deformation.Compared with the conventional reinforced concrete box arch and the composite box arch with plain steel webs and concrete flanges,the calculation method for the ultimate load of this new composite box arch is provided.