无背索竖琴式斜拉桥混凝土斜塔柱合理结构型式分析

无背索斜塔斜拉桥不同于传统的直塔斜拉桥,它是斜拉桥的一种特例,独特之处在于它不设背索,依靠塔柱的自重来平衡桥面恒载和活载,打破了传统直塔斜拉桥的设计理念,改善了桥梁结构和自然景观之间的关系,达到了斜拉桥造型优美独特的效果。以长沙市洪山大桥——单索面竖琴式斜塔斜拉桥为工程背景,参照A lam illo桥和其他同类桥型的相关资料,借助平面及空间有限元分析方法这一手段,从设计的角度通过改变一些重要的设计参数对无背索竖琴式斜塔斜拉桥之混凝土斜塔的合理结构型式进行了探讨,为同类型桥梁的设计提供参考。

Analysis on the reasonable structure of Inclined Concrete Pylon of Harp-shaped Cable-stayed Bridge with No Backstays

The inclined pylon of cable-stayed bridge with no backstays is different from the conventional cable-stayed bridges with upright pylon.It is a special style in cable-stayed bridges.Itsmost prominent character is as fellows: with the elimination of the backstays,the inclined pylon would rely on its own dead weight,serving as a counterbalance to support the dead loads and live loads on the deck.Furthermore,it will enrich the harmonious relationship between bridge construct and natural landscape.As a result,the particularly exquisite shape of cable-stayed bridge would be formed,and the design concept have been broken with tradition.In this paper,refers to the Alamillo bridge and other same bridge type,some studies on the reasonable structural form of inclined concrete pylon of harp-shaped cable-stayed bridge with no backstays are carried out by using the plane and space FEM in which the paper changes some important parameters from the point of design based on the Hongshan Bridge,located in Changsha,Hunan,China,which is a harp-shaped single span inclined pylon cable-stayed bridge.And the results can be used to design sister bridge.