框架结构基础预应力混凝土转换梁的分析与设计
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杨挺1,唐玉宏1,孟少平2,朱虹2(1 南京市市政设计研究院有限责任公司,南京 210008;2 东南大学土木工程学院,南京 210096)[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。[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; 测试分析中图分类号:TU378.2文献标识码:A文章编号:1002848X(2012)11009605Analysis and design on prestressed transfer girders in foundation of a frame structureYang Ting1, Tang Yuhong1, Meng Shaoping2, Zhu Hong2(1 Nanjing Municipal Design and Research Institute Co., Ltd., Nanjing 210008, China; 2 School of Civil Engineering, Southeast University, Nanjing 210096, China)Abstract: 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 good example for the future similar engineering.Keywords: frame structure; viaduct platform; FEM; prestressed concrete; transfer girder; design and research; testing and analysis作者简介:杨挺,博士,研究员级高级工程师,Email:yangting@njszy.com。参考文献[1] JTJ 023—85公路钢筋混凝土及预应力混凝土桥涵设计规范[S]. 北京:人民交通出版社,1985.[2] JTJ 024—85公路桥涵地基与基础设计规范[S]. 北京:人民交通出版社,1985.[3] JTGD 62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S]. 北京:人民交通出版社,2004.[4] JTGD 63—2007公路桥涵地基与基础设计规范[S]. 北京:人民交通出版社,2007.[5] 杨挺,王心联,陆霖,等. 南京火车站站前广场工程初步设计(第一册)[R]. 南京:南京市市政设计研究院,2003.[6] 赵西安. 钢筋混凝土高层建筑结构设计[M]. 2版.北京:中国建筑工业出版社,1995.[7] CJJ 77—98城市桥梁设计荷载标准[S]. 北京:中国建筑工业出版社,1998.[8] GB 50009—2001建筑结构荷载规范[S]. 北京:中国建筑工业出版社,2002.[9] 唐玉宏,杨挺. 南京火车站站前高架平台预应力框架结构设计[J]. 建筑结构,2006,36(S1):(2\|44)\|(2\|48).[10] 吕志涛,孟少平.现代预应力设计[M].北京:中国建筑工业出版社,1998.[11] GB 50010—2002混凝土结构设计规范[S]. 北京:中国建筑工业出版社,2002.[12] 杨挺,孟少平,唐玉宏,等. 南京火车站站前广场环形高架平台桥转换梁和预应力大梁测试分析报告[R]. 南京:南京市市政设计研究院有限责任公司,东南大学华东预应力技术联合开发中心,2005.[13] 王铁梦. 工程结构裂缝控制[M]. 北京:中国建筑工业出版社,1997.