钢筋混凝土框架节点抗震设计与构造

Thought on the Aseismic Design and Structure of Reinforced Concrete Frame Joints

钢筋砼框架结构在强烈地震作用下发生破坏或倒塌,多数是由于梁柱节点破坏引起的。但在设计与施工中,梁柱节点部位常常不被人们重视;节点在梁高范围内柱中箍筋,但在施工时通常不予设置,使该部位脆性破坏现象更为突出,造成梁的主筋锚固得不到保证;在现场施工中因节点内钢筋错综复杂,施工人员也常向设计人员提出取消节点内"多余"钢筋。但从节点核心区的受力状态、节点破坏的机理、节点内箍筋的作用等来看,不仅要精心设计节点,而且还要精心施工,以保证节点的安全性,从而真正满足结构抗震要求。

The destruction and collapse of reinforced concrete frame under strong earthquake are mostly caused by the destruction of beam-column joints. However, beam-column joints are often neglected in the design and construction. The stirrup of joints inside columns in the range of beam height are not often set in the construction, which makes the brittle destruction of this part more prominent and leads to the fail of main rebar＇ s anchorage. Due to complex rebar in joints, constructers often demand designers to cannel ＂redundant＂ rebar in joints. From the aspects of the force state of joint core area, the destruction mechanism of joints and the action of stirrup in joints, joints should be designed and constructed carefully so as to ensure the safety of joints and meet the aseismic requirements in deed.