【作者】 吴泽家；

【导师】 张文福；

【作者基本信息】 大庆石油学院 ， 结构工程， 2008， 硕士

【摘要】 拱是一种用途较为广泛的大跨结构形式,因拱的受力特性以受压为主,因此拱结构的稳定性就成为拱设计中的主要问题,本文就是要研究抛物线钢结构拱的平面内稳定问题。拱的稳定性可以从其荷载—位移全过程曲线进行分析。结构的荷载—位移曲线可以准确的把结构强度、刚度以及稳定性的整个变化历程表示清楚,我们也可以通过荷载—位移曲线研究初始缺陷、跨度等因素对实际结构稳定性能的影响。本文利用大型通用有限元分析程序ANSYS对抛物线实腹钢拱和钢桁架拱结构进行建模及几何、材料非线性稳定分析,画出了它们的内力和位移曲线,通过分析荷载—位移曲线,对拱的失稳形态和稳定性能进行了比较详尽的研究,对影响拱稳定性的多种因素进行了分析和总结,指出了影响抛物线钢拱稳定性的几个主要因素。本文还研究了铰支抛物线实腹钢拱的极限承载力问题,考虑了跨度、矢跨比、材料非线性、杆件截面、拱轴线的初始弯曲对轴压拱承载力的影响,在此基础上建立了拱的稳定系数与正则化长细比的关系。更多还原

【Abstract】 Arch is a form of long-span structure, which has more extensive use. The characteristics of arch in the force is press, so It is very important to analyze the characteristics of stability in design of the arches. The thesis studied the stability behavior of the steel arch.The stability of the arch can be analyzed by load-displacement post buckling curve. Structure’s load-displacement curve can display the whole stages of the strength stiffness and stability clearly. We can research other factors (such as initial shortage and span) having the influence on actual arch’s stability through the load-displacement curve.The paper models and geometrically nonlinear analysis the steel arch and trussed arched by ANSYS...a large-scale current finite element analytical program. The figures of inner and displacements are given. The unstable state and the stability of the arch has been fully researched by analyzing the load-displacement curve. Many stable factors having influence on the arch have been analyzed and concluded. Several main stable factors which have influence on arch have been pointed.The thesis studied further the ultimate strengths of axially loaded pinned arches, considering the effects of span, ratio of high and span, initial crookedness, material nonlinear and sectional size. Stability factors for axially loaded pinned arches are provided. It is found that the relationship between the arch stability coefficient and the arch normalized slenderness ratio is established.更多还原