脱空对钢管混凝土单圆管拱肋面内承载力的影响
发布时间：2018-12-18 09:51
【摘要】：针对钢管混凝土拱肋普遍存在的核心混凝土脱空问题,借助通用结构有限元分析软件ANSYS,利用其自定义截面功能,对具有不同截面脱空率、拱肋脱空比以及脱空位置的抛物线单圆管钢管混凝土拱肋进行了面内竖向荷载作用下的双重非线性有限元分析。研究含钢率、荷载工况、矢跨比等参数一定的情况下,不同脱空形式对单圆钢管混凝土拱肋面内稳定性能的影响。研究结果表明,含钢率、荷载形式、矢跨比等参数一定的情况下,核心混凝土的脱空对拱肋弹性段刚度基本无影响;自弹塑性段开始,随截面脱空率及拱肋脱空比的加大,拱肋刚度削弱明显,面内承载力下降越多;脱空形式一定时,含钢率越小、竖向面内荷载沿拱肋分布越不均匀,拱肋后期刚度及面内承载力受脱空影响越显著。
[Abstract]:In order to solve the core concrete void problem of concrete-filled steel tube arch rib, with the help of the finite element analysis software ANSYS, which has the function of self-defined section, it has different cross section void ratio. The double nonlinear finite element analysis of concrete filled steel tube arch rib with parabola single circular tube under in-plane vertical load is carried out. The influence of different voids on the stability of concrete filled steel tubular concrete arch rib is studied under the condition of certain steel content, load condition and rise-span ratio. The results show that the void of core concrete has no effect on the stiffness of the elastic section of arch rib when the steel content, load form and rise-span ratio are fixed. At the beginning of elastic-plastic section, with the increase of cross section void ratio and arch rib void ratio, the stiffness of arch rib is weakened obviously, and the in-plane bearing capacity decreases more. When the void form is fixed, the smaller the steel content is, the more uneven the vertical load distribution along the arch rib is, and the more obvious the stiffness and in-plane bearing capacity of the arch rib are affected by the void.
【作者单位】： 吉林建筑大学土木工程学院;
【基金】：国家自然科学基金项目(51308254)
【分类号】：TU398.9
[Abstract]:In order to solve the core concrete void problem of concrete-filled steel tube arch rib, with the help of the finite element analysis software ANSYS, which has the function of self-defined section, it has different cross section void ratio. The double nonlinear finite element analysis of concrete filled steel tube arch rib with parabola single circular tube under in-plane vertical load is carried out. The influence of different voids on the stability of concrete filled steel tubular concrete arch rib is studied under the condition of certain steel content, load condition and rise-span ratio. The results show that the void of core concrete has no effect on the stiffness of the elastic section of arch rib when the steel content, load form and rise-span ratio are fixed. At the beginning of elastic-plastic section, with the increase of cross section void ratio and arch rib void ratio, the stiffness of arch rib is weakened obviously, and the in-plane bearing capacity decreases more. When the void form is fixed, the smaller the steel content is, the more uneven the vertical load distribution along the arch rib is, and the more obvious the stiffness and in-plane bearing capacity of the arch rib are affected by the void.
【作者单位】： 吉林建筑大学土木工程学院;
【基金】：国家自然科学基金项目(51308254)
【分类号】：TU398.9
【共引文献】
相关期刊论文 前10条
1 曹建伟;;绩黄高速公路拱桥结构非线性分析[J];安徽地质;2009年04期
2 吴s，
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