无背索竖琴式斜拉桥混凝土斜塔结构设计与研究

无背索斜拉桥是一种全新概念的造型优美独特的桥梁结构形式。它的最大特点是利用塔柱倾斜来平衡桥面恒载和活载,不设背索,改善了桥梁结构和自然景观之间的关系,打破了传统的直塔斜拉桥的设计理念。本文以长沙市洪山大桥——单索面竖琴式斜塔斜拉桥为工程背景,主要从设计的角度介绍了无背索斜塔斜拉桥的受力特点,混凝土斜塔柱主要结构参数的选取、斜拉索的索力确定及其在塔内的锚固位置和形式等。并且通过与常规的直塔斜拉桥的对比分析,对混凝土斜塔的合理结构进行了探讨。

Structure Design and Research on Inclined Concrete Pylon of Harp-Type Cable-Stayed Bridge with No Backstays

The cable-type bridge with no backstays is a new concept bridge structure with particularly exquisite shape.It's most prominent character is that 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.It would enrich the harmonious relationship between bridge construct and natural landscape.The design concept of the upright pylon in conventional cable-stayed bridges would be broken.This paper introduces the characteristics of inclined pylon cable-stayed bridge with no back stays,and major preferences of the structure of inclined concrete pylon,the forces of cable-stayed,the location and approaches of cable-stayed being anchored in the inclined poly from the point of design based on the Hongshan Bridge,located in Changsha City,which is a harp-type single span inclined pylon cable-stayed bridge.By analyzing the differences between the inclined pylon of harp-type cable-stayed bridge and upright poly in conventional cable-stayed bridges,some studies on the reasonable structural form of inclined concrete pylon are carried out in this paper.