134 m简支钢桁梁桥施工控制设计技术研讨

Discussion on construction control design technology of 134 m simply supported steel truss bridge

此设计为一座双线134 m无竖杆整体节点平行弦三角桁架下承式简支钢桁梁桥,计算跨度134 m。主桁上、下弦杆均采用焊接箱形截面,主桁腹杆采用箱形或H型截面。主桁采用焊接整体节点连接,箱形截面杆件均在节点外四面拼接。运用有限元软件Midas/Civil建模分析,桥梁冲击系数查找规范和文献直接得出结果,要求满足相关规范要求。

This design is a through type steel truss bridge with 134 m double track and no vertical bar,parallel chord triangular truss,and the calculated span is 134 m.The upper and lower chords of the main truss adopt welded box section,and the web members of the main truss adopt box or H-section.The main truss is connected by welded integral joints,and the box section members are spliced on four sides of the joint.Using the finite element software Midas/Civil modeling analysis,the bridge impact coefficient is directly obtained from the specification and literature,which is required to meet the requirements of relevant specifications.