A15大蒸港矮塔斜拉桥的设计及关键技术

不同于一般的矮塔斜拉桥,大蒸港矮塔斜拉桥的主梁为曲梁预应力混凝土宽箱结构,主塔为倾斜的钢混结合结构。该文介绍了其总体设计,并针对该桥的特点,采用自适应控制法,通过对主梁和主塔的线形和内力的监测对该桥进行施工控制。研究了宽主梁在施工过程中各节段截面应力和挠度的横向分布情况,以及各斜拉索索力在整个施工过程中的变化规律情况和主塔在施工过程中应力和变形情况。

Design and Key Technology of A15 Dazhenggang Low-pylon Cable-stayed Bridge

Different from the general low-pylon cable-stayed bridges,the main girder of Dazhenggang Low-pylon CableOstayed Bridge is the curve girder prestressed concrete wide-box structure.The main pylon is the oblique steel-concrete combined structure.The article introduces its overall design,and its adapted control method according to its characteristic.The construction of this bridge is controlled by the linear and inner force monitoring of the main girder and the main pylon.The article studies the section stress of each segment and the traverse distribution condition of the deflection in the course of constricting the main wide girder,and studies the varying rule of each stayed cable force in the course of whole construction and the stress and the deformation in the course of constructing the main pylon.