钢筋混凝土柱的预应力加固方法研究

Research on RC Columns Strengthened with Prestressed Struts or Cables

钢筋混凝土柱的预应力加固方法可以分为单侧撑杆加固、双侧撑杆加固以及拉杆加固 ,对不同加固方法的适用范围 ,目前尚未有文献介绍。基于作者提出的卸荷曲线的概念 ,明确划分了不同预应力加固方法的适用范围。并依据应变协调条件 ,结合柱加固时的应力水平 ,推导出撑杆加固法预应力施加值的理论公式 ,指出了加固规范中关于预应力施加值应用的局限性。最后通过算例证明了方法的简便易行 ,且结果可靠。

There are three kinds of methods of concrete column strengthened with prestressed. The concept of unloading curve for the strengthening method with prestressing is introduced. According to the curve, the application scopes of different strengthened methods can be easily distinguished. The equation of prestressing value accordance with the stress level of the strengthened column is developed. At last, two examples are computed according to the method.