简支曲线与直线钢箱梁桥受力性能对比研究

Comparative Study on Mechanical Properties of Simply Supported Curved and Straight Steel Box Girder Bridges

某城市快速路立交匝道桥共有4条匝道,其中匝A分别在跨越现状河道、现状道路处均设置1-60m简支钢箱梁桥,分别为第二联钢箱梁桥、第五联简支钢箱梁桥,桥面宽度均为10.5m,第二联钢箱梁桥平面位于圆曲线上,曲线半径为200 m、钢箱梁顶板采用板肋,第五联钢箱梁桥位于直线上,钢箱梁顶板采用U肋;对这两座钢箱梁桥的结构应力、支座反力等多方面进行计算对比分析,验证两座钢箱梁桥钢结构设计的合理性、安全性,并得出钢箱梁曲线与直线桥的差异性。

There are 4 ramps on an urban expressway interchange ramp bridge. Among them, Ramp A utilizes a 1-60m steel box girder bridge with a deck width of 10.5m at the locations where the ramp crosses the existing river channel and existing roadway, respectively. They were designated as the second steel box girder bridge and the fifth steel box girder bridge respectively. The second steel box girder bridge is on a circular curve with a radius of 200m and adopts a plate ribs design for the top flange plate of the box girder. The fifth steel box girder bridge is on a straight line and has U-ribs on the top flange plate of the steel box girder. Through the calculation and comparative analysis of the stress,support reaction force, deflection, and overturning resistance of the steel box girders, the rationality and safety of the steel structure design of the two steel box girder bridges were validified, and the difference between the steel box girder curve and the straight bridge is obtained.