多拱肋系杆拱桥力学性能分析  

Analysis of Mechanical Performance of Tied Arch Bridge with Multiple Arch Ribs

作　　者：赵辉[1] 郝超[1] 

机构地区：[1]北京市市政工程研究院,北京100037

出　　处：《世界桥梁》2013年第6期52-56,共5页World Bridges

摘　　要：驿前大桥主桥为2×83m三片拱肋系杆拱桥,为验证该桥结构设计的安全性,采用MIDAS Civil建立梁单元模型分析全桥静力性能,采用ANSYS建立拱脚实体模型分析拱脚局部应力。计算结果表明:吊杆关键节点在顺桥向、横桥向及竖向均发生了位移,该桥的力学行为表现出空间效应,在施工和监控时必须关注其3个方向的位移,以免吊杆发生偏位,并设支座预偏量以避免支座发生剪切破坏;全桥及拱脚节点局部应力满足规范要求,结构是安全的。The main bridge of Yiqian Bridge is a 2 X 83 m tied arch bridge with three arch ribs. To verify the safety of the structural design of the bridge, the MIDAS Civil was used to build the beam element model of the bridge to analyze the static performance of the full bridge and the AN SYS was used to build the solid element model of the arch springings to analyze the local stress of the arch springings. The results of the calculation showed that the key nodes of the hangers had displacement in longitudinal and transverse directions of the bridge as well as the vertical direction, the mechanical behavior of the bridge showed the feature of spatial effect and it would be quite nec essary to taking into account the displacement in three directions in the construction and monito ring of the bridge, so as to prevent the offsetting of the hangers. Preoffset should be set for the bearings to prevent the occurrence of shear failure of the bearings. The local stress in the full bridge and the nodes of the arch springings could meet the code requirements, and the structure was safe.

关 键 词：系杆拱桥 多片拱肋 拱脚 局部应力 位移 有限元法 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]