论加劲索对四塔斜拉桥结构整体刚度的影响

四塔斜拉桥由于中间塔顶没有端锚索来限制它的水平变位，使得柔性结构斜拉桥的柔性进一步增大，随之而来的是变形过大，整体刚度不能满足容许变形的要求。结合某黄河公路斜拉桥进行研究，借助已有的改善多塔斜拉桥整体刚度的方法，通过SAP计算分析比较了水平加劲索方案、倾斜加劲索方案及跨中交叉重叠索方案在活载作用下的静力行为差异，得出最有效的方案是水平加劲索方案，考虑其美观时可选择跨中交叉重叠索方案。

Effects of Stiffening Cables on the Whole Rigidity of Four-pylon Cable-stayed Bridges

The intermediate pylon of four-pylon cable-stayed bridges lacks back-stayed cables to limit its longitudinal displacement,which makes the structure more flexible.As a result,its deformation is so considerable that the whole structure's rigidity fails to meet the requirement in deformation tolerance.With a certain cable-stayed bridge over the Yellow River as a practical example,by means of the available rigidity-improving methods at present,an analysis is made,with the finite element software SAP,of the cabl...