下承式连续拱梁组合体系异型拱桥设计  

Design of Through Continuous Arch Beam Composite System Irregular Shape Arch Bridge

作　　者：宋书军 Song Shujun

机构地区：[1]上海林同炎李国豪土建工程咨询有限公司

出　　处：《城市道桥与防洪》2019年第7期79-82,M0011,共5页Urban Roads Bridges & Flood Control

摘　　要：宁海县宁东新城腾飞路下徐溪大桥主桥为25m+80m+25m的空间三角形拱肋异型拱桥,是三跨连续钢箱梁与下承式拱的组合体系。三角形拱桥是目前新近发展的一种异型拱桥结构,该桥以独特的拱结构设计,让人感觉自然流畅,通过结构本身展现的力度感彰显了简洁、挺拔、刚劲有力的造型之美。拱肋为钢结构拱肋,采用全焊钢箱形截面,截面呈六边形布置;两片拱肋之间于顶部设置横向连系。主梁加劲梁采用纵横梁体系。吊索区标准节段长度为7.5m,吊索均采用平行钢丝索。主墩采用柱式墩,桥台采用扶壁式桥台,均下接承台桩基。采用midas软件进行静力及稳定性分析,表明结构的强度、刚度及稳定性均符合规范受力要求。采用ANSYS有限元软件对构造受力复杂的局部关键节点区域进行有限元三维仿真分析可知,局部满足受力要求,结构设计合理。The main bridge of Xiaxu Creek Bridge in Tengfei Road in Ningdong New Town of Ninghai County is a 25 m+80 m+25 m spatial triangular arch rib irregular shape arch bridge, and is a composite system of three-span continuous steel box beam and through arch. The triangular arch bridge is an irregular arch bridge structure recently developed now. This bridge lets the people feel natural and smooth because of its unique arch structural design. The concise, straight, vigorous and powerful modeling beauty is shown through the strength feeling of the structural itself. The arch rib is the steel structural arch rib with the full welding steel box section. The section is arranged in a hexagonal shape. The horizontal connecting system is arranged between two arch ribs up to the top. The stiffening beam of the main girder is the vertical and horizontal beam system. The standard segment of sling area is 7.5 m long. The slings are all the parallel steel wire cables. The main pier is the column-type pier and the abutment is the buttress abutment, which are all connected with the pile foundation of base slab. The software Midas is used to carry out the static and stability analysis. The analysis shows that the strength, rigidity and stability of the structure all meet the standard stress requirements. The finite element software ANSYS is used to carry out the finite element 3D simulation analysis on the local key nodal region with the complex structure stress. The result shows that the stress requirements are locally met and the structural design is reasonable.

关 键 词：异型拱桥 组合体系 桥梁设计 主梁锚固节点 钢结构 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]