重度损伤钢筋混凝土柱修复后的抗震性能研究

EXPERIMENTAL INVESTIGATION ON THE SEISMIC BEHAVIORS OF REPAIRED SERIOUSLY DAMAGED REINFORCED CONCRETE COLUMNS

以重度损伤钢筋混凝土柱为对象,研究其经加固修复后的抗震性能。将钢筋混凝土柱端部塑性铰区范围的混凝土用灌浆料置换,并对柱用单向碳纤维布进行正截面加固,通过对其施加低周期反复荷载,观察其裂缝开展和变形情况,绘制荷载与位移关系的滞回曲线,分析其正截面承载力,与未做加固修复的试件进行对比,研究经加固修复构件的受力和变形性能。结果与GB 50367—2006《混凝土结构加固设计规范》所给的粘贴纤维复合材料加固大偏心受压构件的承载力计算公式进行对比,经加固修复的钢筋混凝土柱的安全性有保证;与未经加固的同样试验条件下的试件进行对比,加固修复试件的承载力提高,滞回环面积增大,其延性和耗能能力均有明显改善。

Taking reinforced concrete columns which are seriously damaged as the research subjects,it is researched the seismic behaviors of the repaired columns.The concrete of columns in the plastic-hinge zone is replaced with grout material and the columns are strengthened with unidirectional CFRP.Then,the experiments are done under low-cyclic and repeated load for the strengthened columns.The cracks development and the deformations of the specimens are observed.The normal section bearing capacity of the columns is analyzed,and the hysteretic curves of loading and displacement are drawn out.Whose results are compared with the performance of the column without pretreatment in order to study the behaviors of capacity and deformability of the repaired and strengthened specimens.By contrasting the experimental values with the values calculated by ＂The Code for Reinforcement Design of Concrete Structures＂（GB 50367—2006）,the repaired and strengthened specimens are safety.Compared with the column without pretreatment under the same condition,the bearing capacity and the hysteretic area of the repaired and strengthened ones are increased,and the ductility and energy-absorbing capacity are significantly improved.