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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 strengthening method of the beam ends reinforced by CFRP was used to study the seismic performance of six reinforced joints under low cyclic loading. Under the action of low cycle and repeated load, the influence of concrete strength and anchoring mode on the reinforcement effect is mainly considered. After cracking, the cracking load, the yield load and the failure load of the specimens were all increased. The closed carbon fiber cloth hoop restrained the concrete to a certain extent, which increased the bearing capacity of the specimens and delayed the crack Produce and develop. The tests were carried out from the aspects of hysteresis curve, stiffness degradation, energy dissipation, ductility, main-reinforcement strain and core-zone shear deformation. After hysteresis loop, the hysteresis loop of the node tends to be full, the stiffness degradation decreases, and the energy dissipation capacity and ductility coefficient all increase to some extent. The main reinforcement strain in the beam column is controlled by the action of carbon fiber cloth.