多塔悬索桥中塔设计的新概念

New Concept of Design for the Mid-Pylon in Multi-Span Suspension Bridges

由于强大的跨越能力和良好的经济性能,多塔索结构桥梁越来越受到重视。在介绍国内外多塔缆索体系桥梁中塔设计理念的基础上,文中提出多塔悬索桥中塔设计的新概念,即框架式塔柱通过改变剪力键设置及塔柱距离调整索塔刚度,满足多塔悬索桥中塔在纵桥向水平刚度上的特殊要求,同时保持索塔在高度方向上刚度连续变化。在此概念的基础上,提出的多塔悬索桥中塔初步设计方案的计算结果表明,新型中塔在满足多塔悬索桥纵桥向水平刚度要求的同时,受力更合理。

The multi-pylon cable-supported bridge becomes more and more important for its great span capability and good economic performance. After introducing the mid-pylons of multi-span cable-supported bridges which are practiced all over the world, a new concept of mid-pylon design in multi-span suspension bridges was proposed. The horizontal rigidity of frame type pylons can be adjusted by changing the type and the number of shear links, and the continuous change from top to bottom of the tower shaft without sudden variation can be guaranteed. Finally, a preliminary design of the new pylon was carried out upon the concept mentioned above. The calculation results prove that the new pylon has good structural behavior.