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通过对1个足尺寸节点试件的低周反复荷载试验和分析,研究了翼缘削弱的型钢混凝土节点的抗震性能。试件按“强节点”设计且对节点核心区附近梁端工字形型钢的上、下翼缘采取狗骨式削弱并适当增加梁端根部到型钢翼缘最大削弱部位纵向钢筋的配筋量。试验结果表明:节点试件的位移延性系数为5.88,符合抗震设计的延性要求;在最大荷载时,试件的等效粘滞阻尼系数为0.34,耗能能力强。有限元分析表明:在型钢混凝土节点中采用这种构造措施,能够把塑性铰控制在梁型钢翼缘削弱的位置,从而降低节点核心区所受的剪力以及梁柱连接焊缝的应力。翼缘削弱的型钢混凝土节点数值模拟结果与试验结果吻合较好,表明所建立的型钢混凝土节点数值模拟技术合理,可用于对型钢混凝土节点受力性能进行深入研究。
The anti-seismic performance of the steel-reinforced concrete joints with a weakening of the flanges was studied by testing and analyzing the low-cycle cyclic loading of one full-size joint specimen. The test piece is designed according to the “strong node” and the upper and lower flanges of the beam-end I-beam near the core of the node are dog-bone-weakened and the reinforcement of the longitudinal reinforcement at the root of the beam end to the weakest part of the steel flange is appropriately increased the amount. The experimental results show that the displacement ductility coefficient of the joint specimen is 5.88, which meets the ductility requirements of the seismic design. At the maximum load, the equivalent viscous damping coefficient of the specimen is 0.34 and the energy dissipation capacity is strong. Finite element analysis shows that adopting this kind of structural measures in SRC joints can control the plastic hinge in the position where the flanges of beam steel are weakened, so as to reduce the shear stress in the core area of joints and the stress in the joint of beam and column joints. The results of numerical simulation of the steel-reinforced concrete joints with weak flanges are in good agreement with the experimental results, which shows that the numerical simulation of the steel-reinforced concrete joints is reasonable and can be used to study the mechanical behavior of steel-reinforced concrete joints.