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钢拱常支承于其他结构上,拱脚在水平方向很难做到完全的刚性支承,拱的支座约束可以用拱脚处的水平弹簧进行等效替代。利用ANSYS有限元程序,采用大挠度变形理论对水平弹性支承拱进行了研究,分析了其平面内屈曲模态和失稳特征,对影响失稳的支座约束刚度、长细比、圆心角和几何初始缺陷等因素进行了深入的探讨。通过构造反映支座约束程度的弹性柔度系数,拟合得到了非线性极限荷载及支座水平位移的计算表达式,并具有良好的精度。理论分析结果表明,在工程设计中应考虑支座约束对拱的影响,并可以利用弹性柔度系数对承载力和支座位移进行定量分析。
The steel arch is usually supported on other structures. The arch foot is hard to be fully rigid supported in the horizontal direction. The arch restraint can be replaced by the horizontal spring at the arch foot. The finite element program of ANSYS was used to study the horizontal elastic support arch with the theory of large deflection deformation. The buckling modes and instability characteristics in plane were analyzed. The restraining stiffness, slenderness ratio, central angle angle Geometric defects such as the initial in-depth discussion. By calculating the elastic compliance coefficient that reflects the degree of constraint of the support, the nonlinear limit load and the calculation expression of the horizontal displacement of the support are fitted and have good accuracy. The theoretical analysis shows that the influence of abutment restraint on arch should be considered in engineering design, and the quantitative analysis of bearing capacity and bearing displacements can be made by using elastic compliance coefficient.