自锚式斜拉-悬索协作体系桥基于强度的极限跨径分析

推导了自锚式斜拉-悬索协作体系桥的极限跨径,分析了其极限跨径与结构几何参数、荷载和材料特性的关系.从材料强度出发,并结合目前桥梁常用的材料,对混凝土主梁和钢主梁自锚式斜拉-悬索协作体系桥在竖向静荷载作用下的极限跨径进行了具体研究,得到了相应的极限跨径上限和各因素对极限跨径的影响.分析结果表明,增大矢跨比、高跨比和斜拉段长度比例,减小二期恒载,均可以提高协作体系的跨径.

Study of limit span of self-anchored cable-stayed suspension cooperation system bridge based on strength

The limit span of self-anchored cable-stayed suspension bridge is deduced. The relations among the geometrical parameters, the loads and the material characteristics are also analyzed. Based on the material strength and the commonly used materials, the limit spans of self-anchored cable-stayed suspension bridges with concrete girder or steel girder under vertical static load are discussed in detail. The corresponding upper limit spans and the influence of the factors on the span are given. The results indicate that increasing rise-span ratio, height-span ratio, cable-stayed segment length or reducing the second dead load can increase the cooperation system span.