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火电厂主厂房型钢混凝土混合结构中存在由于错层、变梁变柱截面引起的异型中节点,选取5个代表性节点进行1∶5缩尺拟静力试验,研究该类节点的滞回性能、耗能能力、延性、刚度退化以及承载能力。研究结果表明:受强梁弱柱特性的影响,4个型钢混凝土异型中节点主要发生不利于抗震的柱端塑性铰破坏,而钢筋混凝土异型中节点由于梁柱刚度比较大主要发生核心区剪切破坏;大小梁错层高度对型钢混凝土异型中节点的承载力、延性性能与刚度特性均有一定的影响,但规律并不明显;型钢混凝土柱-钢筋混凝土梁异型中节点的耗能能力强于钢筋混凝土异型中节点,但受破坏模式的影响,其承载能力、延性与刚度等均低于钢筋混凝土异型中节点;相比采用钢筋混凝土梁的型钢混凝土异型中节点,采用型钢混凝土梁的型钢混凝土异型中节点的开裂荷载高,初始刚度较大,但承载力、延性与耗能能力并未得到明显提高。
There are special shaped nodes in the steel-concrete composite structure of the main powerhouse of the thermal power plant due to the staggered layer and the variable beam cross-section, and 5 representative nodes are selected for the 1: 5 scale pseudo-static test to study the hysteretic behavior and the consumption Ability, ductility, stiffness degradation and load carrying capacity. The results show that the joints of the four special-shaped steel reinforced concrete columns are mainly damaged by the plastic hinges which are not conducive to aseismicity, while the special shaped mid-sections of the reinforced concrete are mainly damaged by core-column shear stiffness because of the large beam-column stiffness ; The height of the split beam has a certain influence on the bearing capacity, ductility and stiffness of the profiled section of SRC, but the law is not obvious; the energy dissipation capacity of SRC-shaped beam is stronger than that of the reinforcement However, the load-bearing capacity, ductility and stiffness of the joints are lower than those of the special-shaped reinforced concrete under the influence of failure modes. Compared with the special-shaped mid-section of the SRC using reinforced concrete beams, the profiled steel reinforced concrete The mid-node has high cracking load and high initial stiffness, but its bearing capacity, ductility and energy dissipation capacity have not been obviously improved.