重度损伤钢筋混凝土柱修复后的抗震性能研究

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...

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

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.