一种新型预应力索-拱结构的弹性稳定性能研究

Elastic stability behavior of a new type of pre-stress cable-arch structure

本文所介绍的索-拱结构,是在圆弧或椭圆形拱轴线上,按照拱在重力荷载作用下的弯矩变化图设置撑杆和拉索(或预应力拉索),以改善拱轴线上不均匀分布弯矩,达到提高纯拱结构刚度及稳定承载力的目的.利用弧长法对这种索-拱结构在全跨均布荷载和半跨均布荷载作用下的面内稳定性能进行了弹性大挠度跟踪分析,揭示了它的受力特性和破坏机理;同时文中还分析了矢跨比和撑杆高度的变化对索-拱结构受力性能的影响.

A new type cable-arch was introduced in this paper where the tensile cables were arranged according to the variation of the bending moment diagram along the axis of the arch subjected to the uniformly distributed gravity load. A full load-displacement equilibrium path was obtained by using the large deflection finite element approach in conjunction with the arc-length method. The mechanical behavior and the failure mechanisms of the cable-arch structure were studied the effect of the two parameters, namely the ratio of rise to span and the length of stay bar on the behavior of such stnletures were drscussed.