索在索-拱结构中的作用

应用非线性有限元方法研究了索对索－拱结构平面内稳定性的影响。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，考虑了不同荷载作用及不同矢跨比对索－拱结构稳定性能及变形性能的影响，并从中获得了一些有益的结论。

Effect of Cables on Stability Analysis of Cable-arch Structure

The effects of cables on the instability behavior of the structure hybridized by I section arch and tensile cables have been studied theoretically by using the large deflection(displacement) finite element approach with beam and cable elements, in conjunction with arc length method and Newton Raphson iteration. A full load displacement equilibrium path is obtained, including pre buckling and post buckling equilibrium path. It is found from the load displacement path that the cables have affect significantly to the structure's behavior, including its limit load carrying capacity and its load displacement paths, and especially they greatly increase the limit load carrying capacity of the hybridized structure by near 40% only in the case of the half span uniformly distributed load. Further more, the effects of 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 structure are drawn from teh numerical results obtained in the study.