索-拱结构的平面内稳定性研究

本文应用非线性有限元方法研究了索 拱结构的平面内稳定问题。文中使用牛顿 拉弗森法和弧长法对荷载 位移平衡路线进行跟踪研究，研究了索对结构的极限荷载和平衡路径的影响；分析中考虑了不同荷载作用、不同边界条件和不同矢跨比对索 拱结构稳定性能及变形性能的影响，从中获得了对索 拱结构设计有益的结论。

Instability Behavior in the Plane of Cable-Arch Structure

This paper presents an elastic nonlinear buckling analysis of a kind of steel structure hybridized by I section arch and tensile cables. The effects of cables on the instability behavior in the plane of the hybrid structure is investigated theoretically by using the large deflection (displacement) finite element approach in conjunction with the arc length method and Newton Raphson iteration. A full load displacement equilibrium path is obtained, including prebuckling and post buckling equilibrium path. It is found that the cables affect significantly the structural behavior, including its limit load carrying capacity and its load displacement paths. Furthermore, the effects of boundary condition and rise span ratio on the limit load carrying capacity are also involved in the theoretical investigation. Some conclusions to the design of the cable arch structures are drawn from the numerical results obtained in the study.