锈蚀钢筋混凝土框架节点抗震性能  

Research on Seismic Behavior of Corroded Reinforced Concrete Frame Joints

作　　者：周静海[1] 李飞龙[2] 王凤池[2] 康天蓓[2] 

机构地区：[1]沈阳建筑大学建筑节能研究院,辽宁沈阳110168 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2016年第3期428-436,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51178275)

摘　　要：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.The purpose of this paper is to find out the impact that axial compression ratio and the corrosion ratio have on the seismic performance of the steel reinforced concrete joint,the authors simulate the cross beam-column joint of the steel reinforced concrete using ABAQUS package.And with the radial displacement method,simulating the rust expansion on the concrete resulting from the steel bars,changing the axial compression ratio and the corrosion ratio of the steel bars,this paper studies the seismic performance of the joint through exerting the low cyclic loading on the end of the beam. Results show that under the same axial compression ratio,comparing with no corrosion specimens,the bearing capacity decreases at the extent of 40 percents and the ductility decreases 20 percents when the corrosion ratio reaches 10 percents;however,with the same corrosion ratio,the bearing capacity,rigidity and the ductility of specimens improve respectively when the axial compression ratio is 0. 4. So the author gets the conclusion that the growing corrosion ratio leads lower bearing capacity of specimens and higher ductility degradation rate. The corrosion process influences the endurance performance of the structure badly and negatively,and increasingthe axial compression for the corrosion reinforced concrete structure joint with no the stirrup occurs in the core region appropriately has positive impacts on the seismic performance of the structure joint.

关 键 词：节点 有限元 锈蚀率 轴压比 抗震性能 

分 类 号：TU375[建筑科学—结构工程]