[提要] 为克服现有混凝土柱加固方法的不足，采用专用螺栓千斤顶对混凝土轴心受压构件进行预应力法加固试验，使卸载和加固同步进行，有效地消除了二次受力应变滞后影响。加固后组合构件整体承载力得到显著提高，被加固构件和加固构件共同作用效果良好。
[关键词]  预应力法加固  轴心受压  混凝土柱  应变滞后

In order to dispel the defects of the methods of strengthening concrete columns under axial　compression,a new way called prestressing by bolt-jack is presented.The results indicate that the lagging of strain produced by repressing can be avoided, and the unloading and strengthening can be acted at the same time. The ultimate strength of the strength-ened columns is increased remarkably. The added parts and the original column work well together.
Keywords: strengthening; prestress; concrete column; axial compression; strain lagging

    参  考  文  献
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