论文部分内容阅读
目的找出轴压比和纵筋锈蚀率对钢筋混凝土框架节点抗震性能的影响规律.方法利用有限元分析软件ABAQUS模拟十字形钢筋混凝土梁柱节点.采用径向位移法,模拟钢筋对周围混凝土的锈胀作用,改变轴压比和钢筋锈蚀率,研究节点在低周反复荷载作用下抗震性能.结果相同轴压比下,与无锈蚀试件相比,当锈蚀率达到10%,试件承载力下降达40%,延性下降达20%;相同锈蚀率下,轴压比为0.4时,构件承载力、刚度、延性均有所提高.结论钢筋混凝土框架节点随着纵筋锈蚀率的增大,构件承载力降低,延性退化率逐渐增大.钢筋锈蚀严重影响结构的耐久性能,核心区无箍筋的锈蚀钢筋混凝土框架节点,适当地提高轴压比有利于提高框架节点的抗震性能.
Objective To find out the influence law of axial compression ratio and longitudinal reinforcement corrosion rate on the seismic behavior of reinforced concrete frame joints.METHODS The finite element analysis software ABAQUS was used to simulate the cross-shaped reinforced concrete beam-column joints.The radial displacement method was used to simulate the influence of reinforcement on the surrounding concrete The effect of the axial compression ratio and the corrosion rate of the steel bar were changed, and the anti-seismic performance of the joint under low cyclic loading was studied.Results Compared with the non-corroded specimens, when the corrosion rate reached 10% under the same axial compression ratio, Force decreased by 40% and ductility decreased by 20%. The bearing capacity, stiffness and ductility of the members increased with axial compression ratio of 0.4 under the same corrosion rate.Conclusion With the increase of longitudinal corrosion rate of reinforced concrete frame joints, , The bearing capacity of the component decreases and the ductility degradation rate increases gradually.The corrosion of the steel bar seriously affects the durability of the structure, and there is no stirrup reinforced concrete frame node in the core area.