(吉林省建筑设计院有限责任公司第二设计所 长春 130051)
［提要］ 由于建筑改变了使用功能要求，某工程裙房顶层的一根框架柱需要拆除。在抽柱改造中应用了预应力钢筋混凝土桁架加固体系。采用主动受力方式，有效地解决了改造加固过程中加固体系应力滞后和结构构件二次受力和二次变形等问题。经过两年多的使用验证，改造加固效果良好。
［关键词］ 预应力 桁架 加固 结构变形 荷载重新分配 二次应力 主动受力
Prestressed Concrete Truss in Column Pulling Reconstructed Application/Huang Yongcun（Jilin Province Architecture Design Ltd.,No.2 Department,Changchun 130051,China）Abstract:Because of building functional requirment,one column on the top floor is needed
 to be demolited. Prestressed concrete truss strengthening system was used in concrete beams beside demoliting column. The prestressed concrete structural element force method is used in the strengthening system.According to active force method, the problem of stress lag behind and the structural element change shape second time are solved. After two years application, reconstructed reinforcing effect has been proved very well.
Keywords:prestressed; truss; reinforcing; construction deformation; load redistribution; secondary stress; active pressure