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框架节点是框架结构的关键部位。框架节点区的受力状况比较复杂,研究人员通过对震害的调查和研究,得出在地震作用下,当框架节点承受较大水平剪力作用时,极可能会产生剪切脆性破坏而使框架失去承载能力。另外,框架节点是框架梁、柱纵筋的锚固区,由于荷载的长期作用,混凝土与钢筋的粘结力会降低,会出现钢筋的锚固破坏,使得节点的强度、刚度和耗能能力降低。因此,框架节点的抗震设计成为了框架结构设计的重点内容。本文从框架结构抗震延性设计的一般原则“强柱弱梁”、“强剪弱弯”和“强节点、强锚固”出发,对钢筋混凝土框架节点的抗震设计进行了探讨。
The frame node is the key part of the frame structure. The stress situation in the node area of the frame is rather complicated. Through the investigation and study of the earthquake damage, the researchers concluded that under the action of earthquake, when the frame node is subjected to a large horizontal shearing force, it is very likely that shear brittle failure will occur The framework loses its carrying capacity. In addition, the frame node is the anchorage zone of the frame beam and the longitudinal reinforcement. Due to the long-term load, the bond between the concrete and the reinforcement will be reduced, and the anchorage failure of the reinforcement will occur, resulting in the decrease of strength, stiffness and energy dissipation of the node. Therefore, the seismic design of the frame node has become the focus of the frame structure design. In this paper, the seismic design of reinforced concrete frame joints is discussed based on the general principles of seismic design of frame structures, such as “strong column weak beam”, “strong shear weak bend” and “strong node and strong anchor” .