STUDY ON RETROFITTING OF REINFORCED CONCRETE COLUMNS TO RESIST AGAINST SEVERE EARTHQUAKE MOTION

对钢筋混凝土柱试件进行了拟静力循环加载试验，加固方法如下：(1)用聚合物砂浆覆盖试件，并在试件周围铺设碳纤维增强塑料（CFRP）网格作为增强材料；(2)用环氧树脂涂覆试件，并用碳纤维薄板（CFS）织物包裹试件。施加逐渐增大的横向荷载和恒定的轴向荷载，测量试件的滞回荷载-位移关系。结论总结如下：1。聚合物砂浆可以作为覆盖材料，与非收缩砂浆相比，聚合物砂浆具有更理想的韧性。CFRP预制格栅不仅可以作为主筋，还可以作为侧筋，从强度和韧性的角度来看，它比额外的钢筋更有效。CFS增加承载能力，如果这些板适当地固定在柱的基础上。

Quasi-static cyclic loading tests of reinforced concrete column specimens were carried out that were strengthened as follows ; (1) specimens were covered with polymer mortar in which carbon fiber reinforced plastic (CFRP) grid was placed around the specimens as reinforcements, and (2) specimens were coated with epoxide resin and wrapped in a carbon fiber sheet (CFS) fabric. Applying gradually increasing transverse load with constant axial load to the specimens, hysteretic load-displacement relationships were measured. Conclusions are summarized as follows.1. Polymer mortar can be used as covering material exhibiting more desirable toughness compared with non-shrinking mortar,2. CFRP precast grids, which work not only as main reinforcements but also as lateral ties, are more effective as reinforcements than additional steel bars from the point of view of strength and toughness and3. CFS increase load-carrying capacity, if those sheets are properly fixed to the column base.