碳纤维布加固框架节点低周反复荷载试验研究

Experimental study on the beam-column joint strengthened with CFRP under low-cycle reversed load

采用碳纤维布加固框架节点梁端的加固方式,研究了6个加固节点在低周反复荷载作用下的抗震性能。低周反复荷载作用下,着重考虑了混凝土强度和锚固方式对加固效果的影响。加固后试件的开裂荷载、屈服荷载和破坏荷载均有所提高,梁上的封闭碳纤维布箍对混凝土起到良好的约束作用,在一定程度上提高了试件的承载力,延缓了裂缝的产生和发展。试验从滞回曲线、刚度退化、能量耗散、延性、主筋应变及节点核心区剪切变形等方面进行了研究。加固后节点的滞回环趋于饱满,刚度退化减小,耗能能力和延性系数均有不同程度的提高,梁柱中主筋应变由于碳纤维布的作用而得到控制。

The experiment of 6 beam-column joints strengthened with CFRP under low-cycle reversed load is performed. Two influencing factors： concrete intensity and anchor methods under low-cycle reversed load are considered. The cracking load, bending load and destructive load are improved. The close CFRP hoop on the beam can restrict concrete, so as to enhance its bearing capacity and relay the occurrence and development of the cracks. The hysteresis loop, stiffness digration, energy dissipation, ductility, reinforcement strain and shearing deformation of core of beam-column joints are studied. The aaeismic behavior of reinforced members have been improved. Because of CFRP, reinforcement strain can be controlled.