特大跨径拱桥系杆张拉优化技术分析  

Analysis of Tensile Optimization Technique of Tie Bar of Super Long Span Arch Bridge

作　　者：戚亮[1] 李飞[2] QI Liang;LI Fei(Teacher Work Department Yellow River Conservancy Technical College,Kaifeng 475004,China;School of Civil Engineering Chongqing Jiaotong University,Chongqing 401331,China)

机构地区：[1]黄河水利职业技术学院教师工作部,河南开封475004 [2]重庆交通大学土木学院,重庆401331

出　　处：《交通工程》2024年第9期99-104,共6页Journal of Transportation Engineering

基　　金：黄河水利职业技术学院青年骨干教师培养计划(编号:2019HYGG33);《复合材料预紧力齿连接多齿接头的疲劳试验研究》。

摘　　要：为提高威海石家河公园大桥这一特大跨径拱桥的结构稳定性,保障拱桥建筑施工质量,研究特大跨径拱桥系杆张拉优化技术分析。威海石家河公园大桥共采用34根吊杆,其中中拱14根吊杆,边拱20根吊杆,考虑系杆张拉顺序对质量的影响,设计2种张拉方案,方案1为先张拉两边吊杆、后张拉中间吊杆;方案2为先张拉中间吊杆、后张拉两边吊杆。采用有限元模拟2种张拉方案在施工时所产生的应力、位移变化,从而选取最佳方案。模拟分析可知:采用方案1张拉时主梁所承受应力更大,且主梁、中拱、边拱的位移明显较大,而采用方案2张拉时,可避免主梁出现严重失稳问题,还可保持较小的拱肋位移;同时方案2稳定安全系数较高,在成桥阶段方案2最大吊杆拉应力为433.0 MPa,处于1860钢绞线的安全承载范围内。可见采用先张拉中间吊杆、后张拉两边吊杆方式可有效实现系杆张拉优化。In order to improve the structural stability of the Weihai Shijiahe Park Bridge,a super long span arch bridge,and ensure the construction quality of the arch bridge,the optimization technology analysis of the tie rod tension of the super long span arch bridge is studied.The Weihai Shijiahe Park Bridge adopts a total of 34 suspension rods,including 14 suspension rods for the central arch and 20 suspension rods for the side arch.Considering the influence of the tensioning sequence of the tie rods on the quality,two tensioning schemes are designed.Scheme one is to first tension the suspension rods on both sides and then tension the middle suspension rod;Option 2 involves first tensioning the middle suspension rod and then tensioning the two side suspension rods.Using finite element simulation to simulate the stress and displacement changes generated by two tensioning schemes during construction,in order to select the optimal scheme.Simulation analysis shows that when scheme one is used for tensioning,the stress borne by the main beam is greater,and the displacement of the main beam,middle arch,and side arch is significantly larger.However,when scheme two is used for tensioning,it can avoid serious instability problems of the main beam and maintain a smaller displacement of the arch ribs;At the same time,Scheme 2 has a high stability and safety factor.During the bridge completion stage,the maximum tensile stress of the suspension rod in Scheme 2 is 433.0 MPa,which is within the safe bearing range of 1860 steel strands.It can be seen that the method of first tensioning the middle suspension rod and then tensioning the suspension rods on both sides can effectively achieve the optimization of tie rod tensioning.

关 键 词：特大跨径拱桥 系杆张拉 有限元 拱肋位移 稳定安全系数 拉应力 

分 类 号：U448[建筑科学—桥梁与隧道工程]