碳纤维布-梁端加腋组合方法抗震加固混凝土框架节点研究

Research on Seismic Behavior of RC Frame Joints Upgraded by Composite Scheme of CFRP Sheets and Beam Haunch

为进一步提高碳纤维布加固方法对于混凝土框架节点抗震性能的改善效果,在碳纤维布加固体系中引入了素混凝土梁端加腋,构成碳纤维布-梁端加腋组合加固方法。根据3个混凝土框架节点的低周反复加载试验,从破坏模式、延性性能、承载力、滞回性能以及强度和刚度退化等方面验证了该方法的加固效果。并在试验的基础上,提出了碳纤维布-梁端加腋组合加固节点核心区的受力分析模型及相应的抗剪设计公式。

To enhance the effect of the CFRP scheme used to improve the seismic behavior of RC beam-column joint, the plain concrete beam haunch was added to CFRP scheme to form the composite strengthening scheme of CFRP sheet and beam haunch. The quasi-static test results of three RC beam-column joints verified the efficiency of the scheme in aspect of failure mechanism, ductility, load-carrying capacity, hysteretic response, strength degradation and stiffness degradation. The analytical model used to describe the shear mechanism of joint core upgraded by the scheme is presented and the corresponding shear design formula is derived from the mechanism.