徽水河大桥塔梁结合段构造优化研究

Study on Structural Optimization of Tower Beam Joint Section of Huishui River Bridge

斜拉桥外倾H型塔柱与钢板组合主梁在塔梁结合处采用固结式连接,是一种构造较为复杂的斜拉桥塔梁连接形式。本文以芜黄高速徽水河大桥为依托,利用有限元分析和BIM模型分析方法,从受力需求和施工便利性角度对塔梁结合段的合理构造进行研究。结果表明,钢板组合主梁在塔梁结合段位置存在刚度突变,应在靠近结合面位置合理设置过渡加劲以实现应力平顺过渡,优化后的结合段局部受力状态良好;采用BIM技术准确模拟结合段范围内钢构件、钢筋、预应力空间位置,以主受力钢筋和钢构件保持连通为原则,精准确定钢梁开孔位置,保障了开孔质量与精度,解决了结合段钢结构及钢筋安装难题,最后提出合理的塔梁结合段构造形式。

The outward inclined H-shaped tower column and steel plate composite main beam of cable-stayed bridge are connected by consolidation at the junction of tower and beam,which is a tower beam connection form of cable-stayed bridge with complex structure.In this article,in order to study the reasonable structure of this connection mode,based on Huishui River Bridge of Wuhu-Huangshan Expressway,the reasonable structure of tower beam joint section was studied from the perspective of stress demand and construction convenience by using the methods of finite element analysis and BIM model analysis.The research shows that there is a sudden change of stiffness in the tower beam joint section of the steel plate composite girder,and the transition stiffener should be reasonably set near the joint surface to realize the smooth transition of stress,and the local stress state of the optimized joint section is good.Through the accurate simulation of the spatial position of steel members,reinforcement and prestress within the binding section of BIM model,based on the principle of maintaining the connection between the main stressed reinforcement and the main stressed steel members,the difficult problems of steel structure and reinforcement installation in the binding section can be solved by accurately opening the steel members,and a reasonable steel beam structure in the binding section can be obtained.