（1 东南大学土木工程学院  南京 210096； 2 南京工业大学加固与鉴定中心  210009）
【提要】  应用体内外同索预应力结构解决了在加固与改造工程中抽柱扩跨问题。该结构体系考虑了抽柱扩跨加固与改造时对邻近跨的影响，将部分体内预应力筋延伸至体外加固原有梁，解决预应力筋在端头锚固集中问题的同时也减少了植筋的数量，用交叉布束的方式代替平行布束，避免使用复杂的转向块装置。通过实例说明了该加固法的计算步骤和方法。
【关键词】  体内外同索  抽柱扩跨  加固
Strengthen Design for Cutting Column and Extending Span by Using the Prestressed  Structure with Same Tendon Located Internally and Externally/Yuan Aimin1,Li Yanhe2,Wu Yuan1(1 Civil Engineering College,Southeast University，Nanjing 210096，China; 2 Center of Strengthen and Appraiser,Nanjing University of Technology，Nanjing 210009，China)
Abstract:The novel prestressed structure with the same tendon whose one part of it is ext
ernal and the other part of it is internal,is used to cut column and extend span in the strengthen and retrofitted engineering.The effect on vicinity span caused by cutting  column and extending span is considered.The present method is not only resolved the a
nchorage problem of prestressing tendon at the end of beam but also cut down the quantity of adhesively bonded bar,and it is pointed out that the arrangement of  prestressing tendon with cross instead of parallel can avoid using complicated turnaround device.It demonstrates the design process of caculation method by an engineering,and discusses the existing problem and further research subjects.
Keywords:internal;external tendon;cutting column;extending span;retrofitted