重庆石板坡长江大桥复线桥钢-混凝土接头设计

在混合梁斜拉桥中使用钢-混凝土接头有3种形式,其接合部位有4种接合方式。针对重庆石板坡长江大桥复线桥钢-预应力混凝土组合连续刚构梁式桥,采用PBL剪力板及加预应力束的设计方法,通过参考国内外规范,局部分析及钢-混凝土接头的试验验证,提出对于传递弯矩和剪力的梁式钢-混凝土接头,采用PBL剪力板与预应力束组合的设计理念,并重点介绍PBL剪力板的作用原理及强度计算方法。

Design of Steel and Concrete Joints of Double-Line Bridge of Shibanpo Changjiang River Bridge in Chongqing

There are three kinds of steel and concrete joints used for hybrid girder cable-stayed bridges and four ways of jointing at the joint parts of the bridges.In the light of the situations of the steel and prestressed concrete continuous hybrid rigid-frame girder type structure of the double-line bridge of Shibanpo Changjiang River Bridge in Chongqing,the joint parts of the bridge have been designed by the method of PBL shearing plates plus prestressing strands.Further with reference to the domestic and foreign codes and specifications,and through local analysis and test verification of the steel and concrete joints,the design conception of PBL shearing plates plus prestressing strands is proposed for the girder type steel and concrete joints that will transmit both bending moment and shearing forces.In this paper,the function principles and strength calculation method for the PBL shearing plates are mainly described.