摘要
结合南京火车站站前广场环形高架平台桥工程,针对预应力框架结构中两根大跨度支承柱不能与已建成的地铁车站预留的钢骨混凝土柱相对接的情况,采用转换层结构,通过转换梁将框架柱的内力传给地铁站预留柱及桩基础。采用SATWE设计软件和ANSYS有限元软件,进行了环形高架平台桥(包括预应力混凝土转换梁)的整体结构分析与设计,并实施了现场测试与分析。设计、施工和测试结果表明:转换层结构解决了平台桥柱受力传递的结构设计难题;预应力混凝土转换梁相对其他转换结构形式具有适合性、合理性和可实施性;选用有限元进行预应力转换梁的内力分析,较符合实际受力工况,且转换梁的承载力、裂缝宽度验算及挠度计算在监测中得到了进一步的验证。其成果对预应力混凝土转换梁在桥梁工程中的应用与研究具有一定的借鉴作用。
Based on the circle-shape viaduct bridge in Nanjing Railway Station＇ s Square, the design and research of prestressed frame were developed. There were two pillars of the viaduct bridge could not be put on the reserved location of metro station under the ground. By the use of crossed prestressed girders, the foundation of the viaduct bridge was elevated and the internal forces of the frame were transferred to the reserved pillar and its foundation in the metro station. The structure analyses of the prestressed transfer girder were discussed. In addition, by using of SATWE and ANSYS, the design scheme of circle shape viaduct （including prestressed transfer girders） was introduced. By the use of FEM, the internal force and stress of transfer girders were calculated. Some in-situ tests were also applied. The bearing capacity, crack width and transformation of the girder were tested in construction process. The testing results show that the design of prestressed transfer girders is right. The in-situ tests show that the transfer girders are safe and reasonable. This transfer structure provides a good way to resolve the problem of force transition of viaduct above the metro station. Some reliable design and calculating methods are given. In a word, this study made a ~ood example for the future similar entgineering.
出处
《建筑结构》
CSCD
北大核心
2012年第11期96-100,86,共6页
Building Structure
关键词
框架结构
高架平台
有限元
预应力混凝土
转换梁
设计研究
测试分析
frame structure
viaduct platform
FEM
prestressed concrete
transfer girder
design and research
testing andanalysis
