安庆长江铁路大桥主桥桥面系受力分析

安庆长江铁路大桥主桥为主跨580 m的六跨连续钢桁梁斜拉桥,桥面系采用正交异性钢桥面系。为验证该桥整体桥面系结构受力是否合理以及能否有效参与主桁结构的共同受力,采用有限元分析程序ANSYS分别建立3号桥塔支座附近E17～E23六个节间和中跨跨中E37～E43六个节间的钢桁梁节段模型,对桥面系中纵梁、横梁及横肋、桥面顶板的应力进行分析。分析结果表明:在设计荷载作用下,桥面系中纵梁、横梁、桥面顶板的应力水平均满足规范要求;桥面系受力横向分配比较均匀,结构整体刚度好;同一主桁断面处桥面顶板和纵梁的纵向应力分布较均匀,桥面系结构能有效参与主桁共同受力。

Analysis of Force Conditions of Floor System of Main Bridge of Anqing Changjiang River Railway Bridge

The main bridge of Anqing Changjiang River Railway Bridge is a six-span continuous steel truss girder cable-stayed bridge with a main span 580 m and with its floor system used with the integral orthotropic steel floor system.To check if the force conditions of the floor system of the bridge are rational and if the system can effectively participate with the main truss structure in load bearing,the finite element analysis program ANSYS was used to respectively establish the steel truss block models for the six panels of the E17～E23 nearby the bearing of the pylon on Pier No.3 and the six panels of the E37～E43 close to the midspan of the central span,and the stress of the middle stringers,cross beams,cross ribs and top plates of the floor system was analyzed.The results of the analysis reveal that under the action of the designed load,the stress levels of the middle stringers,cross beams and top plates can meet the relevant requirements in the codes,the transverse force distribution of the floor system is uniform and the integral rigidity of the structure is good.In the same section of the main truss,the longitudinal stress distribution of the top plates and stringers is uniform as well and the floor system can well participate with the main truss structure in the load bearing.