摘要
张弦梁结构因结构体系简单、受力明确、造型美观等优点,近年来被广泛应用于城市景观桥梁。以某跨径为54.5 m张弦梁桥为研究对象,用Midas软件开展有限元分析。同时,结合施工过程现场测试数据,对张弦梁桥各部件应力与线形的施工控制进行研究。结果表明,考虑分节段架设自重、空缆状态与人群荷载的主梁预拱度,可使主梁成桥线形基本平顺,与设计预拱度最大误差仅为3.57%;主梁控制截面应力实测值与计算值差值在9.06%以内;主缆索力与设计索力差值在3.60%以内;保证了张弦梁桥成桥运营阶段的预拱度、力学性能等各项指标满足规范要求,可为后续同类型桥梁的施工监控提供参考和借鉴。
Due to the advantages of simple structure system, clear force and beautiful shape, beam string structure has been widely used in urban landscape bridges in recent years. Based on a string girder bridge with the main span of 54.5 m, using Midas software to carry out finite element analysis, and combined with the field test data during the construction process, the stress and alignment control of the components of the string girder bridge is studied. The results show that the pre-camber of the main girder considering the dead weight of segmental erection, the state of cable and the load of crowd can make the bridge alignment of the main girder basically smooth, and the maximum error between the pre-camber and the design is only 3.57%. The difference between the measured and calculated stress of the control section of the main beam is less than 9.06%. The difference between the main cable force and the design cable force is within 3.60%. It can ensure that the pre-camber, mechanical properties and other indicators of the completed bridge operation stage meet the requirements of the code, which can provide reference for the construction monitoring of the same type of bridge.
作者
屈红伟
QU Hongwei(Xiamen Municipal Construction and Development Co.,Ltd,Xiamen 361000)
出处
《福建建筑》
2022年第11期103-108,共6页
Fujian Architecture & Construction
关键词
张弦梁桥
施工监控
数值分析
线形
应力
预拱度
Beam string structure
Construction monitoring
Numerical analysis
Linear
Stress
Camber
