钢管混凝土圆弧拱平面内非线性稳定承载力

In-plane nonlinearity stability strength of circular concrete-filled steel tub ular arches

采用考虑屈曲前变形的弹性稳定公式,基于统一理论的钢管混凝土截面抗压承载力计算方法,研究了均布径向荷载作用下钢管混凝土圆弧拱的平面内非线性稳定承载力,并在分析中考虑了几何非线性、材料非线性和拱肋初始缺陷的影响.通过对比有限元结果和各国典型设计规范提供的稳定系数公式,提出了适合钢管混凝土圆弧拱的平面内非线性稳定系数,为钢管混凝土拱桥的设计提供依据.

The elastic-plastic buckling resistance for both shallow and non-shallow concrete-filled steel tube （CFST） arch bridges was investigated under radial uniformly distributed loads, and the method was verified by a finite element model which took the effect of large deformations, material nonlinearities, and initial geometric imperfection into account. By comparing the finite element results with the equations given by different specifications, a reasonable in-plane slenderness reduction factor suitable for CFST arches design was proposed, which provided a reference for design of CFST arch bridges.