初始几何缺陷对钢管混凝土拱桥极限承载力的影响

Effects of Initial Displacement Imperfection on Ultimate Strength of Concrete Filled Steel Tube Arch Bridge

中文关键词:初始挠度缺陷；钢管混凝土  肋拱  极限承载力

英文关键词:initial displacement imperfection  concrete filled steel tube (CFST)  rib arch  ultimate strength

中文摘要:

      考虑拱肋初始挠度缺陷的影响，采用钢管混凝土组合材料的本构关系，建立钢管混凝土肋拱计算模型。利用混合法对一具体桥例进行了材料与几何双重非线性受力分析。通过不同形式和不同大小的初始几何缺陷下的极限承载力分析，说明初始几何缺陷超出规定的数值范围后对极限承载力影响显著，桥梁施工中应严格控制各种位移偏差。

英文摘要:

      Considering the effects of initial displacement imperfection of arch rib, an approach for double nonlinear stability analysis of concrete filled steel tube (CFST) arch bridge is presented based on the combinatorial material constitutive relation of CFST. The mixed method is used to analyze the ultimate strength of CFST arch bridge under different shape and value of the initial displacement imperfection. The results indicate that overrunning initial displacement imperfection evidently affect the ultimate strength of CFST arch bridge, and the initial displacement should be strictly controlled during the construction.