新型混凝土材料加固震损RC框架柱抗震性能试验研究

通过5根采用新型混凝土材料加固RC框架柱和1根未加固框架柱在定常轴力和水平往复荷载作用下的拟静力试验,研究了不同震损程度和不同加固方式对试件抗震性能的影响.试验结果表明:各加固试件的极限承载力相对于未加固试件均有不同程度的提高,其中三面加固柱极限承载力高于单面加固柱,而四面加固柱极限承载力最高;中等震损和严重震损试件经加固后的极限承载力比未损直接加固试件的极限承载力略低,但相差不大.采用新型混凝土材料加固受损试件,能够有效的提高受损构件的滞回性能、极限承载力和刚度等抗震性能.

Experimental researches on seismic behavior of earthquake-damaged RC frame columns strengthened with new concrete material

Quasi-static tests of five reinforced concrete frame columns strengthened with new concrete material (NCM) and one column without strengthening under constant axial load and cyclic lateral load were conducted. The influences of parameters including damage levels and strengthening methods on seismic behaviors of the six columns were investigated. Tests results show that the ultimate bearing capacity of all the five strengthened specimens were enhanced in different levels relative to the one without strengthening, where the column strengthened by three sides performs better than that strengthened only one side, while the column strengthened by four sides is the best. The ultimate carrying capacities of those with moderate damage or severe damage are slightly lower than that of the column strengthened directly without damage. The tests also indicate that the seismic behaviors, such as hysteretic performance, carrying capacity and stiffness, of the damaged columns strengthened with NCM were improved significantly.