BIM技术在常泰长江大桥主航道桥设计阶段的应用

Application of BIM Technology in Design Stage of Main Navigational Channel Bridge of Changtai Changjiang River Bridge

常泰长江大桥集高速公路、普通公路、城际铁路三种交通功能于一体,其主航道桥为主跨1 176m的公铁合建斜拉桥,采用了多种创新结构。该桥在设计阶段全面采用BIM技术进行正向参数化设计,为结构创新提供助力,缩短设计时间,保证设计质量。通过对沉井、桥塔、主梁进行建模方法研究,比较自顶向下和自底向上两种建模方法的适用场景,提出减少重复建模工作量和提高参数传递自动化的思路并成功应用。沉井采用自顶向下与自底向上相结合的方法设计;桥塔采用自顶向下的方法设计;主梁创新地采用基于面向对象法自底向上的方法设计。BIM技术在该桥设计阶段的应用,对多种复杂的桥梁结构BIM建模均有参考意义。

The main navigational channel bridge of Changtai Changjiang River Bridge is a rail-cum-road cable-stayed bridge with a main span of 1176 m,which will accommodate highway,urban roadway and railway traffic.Multiple innovations are presented in the bridge structure.In the design stage,BIM technology was employed to perform top-down parametric design,aiming to aid structural innovation,shorten design time,and ensure design quality.Based on the numerical simulation of caissons,pylons and main girder,the application scenarios of top-down design and bottom-up design were compared,and the design principle was concentrated on reducing repeated modeling work and improving the automatic degree of parameter transfer.The caissons were designed by the combination of top-down and bottom-up methods,the pylons were designed by the top-down method,and the steel truss girder was designed by the bottom-up method to realize the object-oriented effect.The application of BIM technology in the design stage of the bridge gives insight into the information modeling of different complicated bridge structures.