浅析钢纤维对框架节点抗震性能的改善

Improvement on Behavior of Frame Joints Using Steel Fiber Reinforced Concrete

文章运用《断裂力学》中叠加原理和能量消耗原理分析了钢纤维对混凝土基体的阻裂增韧机理,从微观上阐明钢纤维对混凝土韧性性能的改善。基于钢纤维混凝土框架节点试验研究现状,叙述钢纤维混凝土节点经典受力破坏过程,分析了节点裂缝扩展、极限抗剪能力、延性以及耗散地震能的性能,从宏观上阐明钢纤维对混凝土抗震性能的改善。最后,综合上述分析,提出了钢纤维混凝土框架节点抗震设计的一些建议。

The K-superposition method and principle of energy consumption had been improved in this paper to interpret the mechanism of strengthening and crack arresting of steel fiber reinforced concrete. From microcosmic perspective, improvement on toughness property of concrete adding steel fiber was explained. Typical failure process of steel fiber reinforced concrete frame joints was described taking account of current experiment research status. Then from macroscopic view, improvement on seismic behavior of steel fiber reinforced concrete frame joints was illuminated, including crack propagation of joints, ultimate shear-resistant capacity, ductility, and energy dissipation capacity. Finally, some effective recommendations are proposed for the seismic design of steel fiber reinforced concrete frame joints.