脱空对钢管混凝土拱肋内力分布的影响

利用ANSYS对面内荷载作用下的钢管混凝土单圆管拱肋进行双重非线性有限元分析。考虑核心混凝土脱空,对拱肋在全跨及半跨均布荷载作用下的内力情况进行分析。研究面内荷载作用下矢跨比、截面脱空率、脱空范围及初始缺陷对抛物线拱内力分布的影响。分析结果表明,矢跨比、截面脱空率、脱空范围对拱肋的内力值有影响,但不影响拱肋的内力分布规律;拱肋的初始缺陷会影响拱肋的弯矩分布规律,不影响轴力分布规律。

RESEARCH ON THE INTERNAL FORCE DISTRIBUTION OF CONCRETE FILLED STEEL TUBE ARCH-RIBS WITH SEPARATION AND CAVITIES

We use ANSYS to carry out dual nonlinear finite element analysis on the arch rib of single tube CFST.Considering the void of core concrete,we carry out internal force analysis of arch rib under full span and half span loading,study the influence of rise-to-span ratio,cavity ratio of section,cavity range and initial imperfection on the internal force distribution of parabolic arch rib under in-plane load.In conclusion,the rise-to-span ratio,cavity ratio of section,cavity range have influence on the internal force of arch rib,but have no effect on internal force distribution of arch rib.The initial imperfection will affect the bending moment distribution of arch rib,but have no effect on axial force distribution.