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为改善高强钢筋高强混凝土框架节点抗震性能,提出在节点核心区及向梁延伸一定范围内采用高韧性混凝土的增强措施。通过对3个不同范围采用高韧性混凝土进行增强的高强混凝土框架边节点试件和1个同条件下未增强的试件进行梁端低周往复试验,对比试件破坏形态、滞回特性、承载力、变形、延性、刚度退化和耗能等抗震性能指标。结果表明:在节点区采用高韧性混凝土进行增强,可以改善节点破坏形态,提高节点位移延性和耗能能力,减缓刚度退化。在节点核心区向梁延伸1倍有效梁高范围采用高韧性混凝土进行增强的节点,其承载能力、变形和耗能能力最好。
In order to improve the aseismic performance of high-strength reinforced concrete high-strength concrete frame joints, the reinforcement measures of using high-toughness concrete in the core area of the joint and extending to a certain extent to the beam are proposed. Three low-profile reciprocating tests were carried out on three low-profile specimens with high-strength concrete frame strengthened with high-strength concrete at three different extents and one specimen without reinforcement under the same conditions. The failure morphology, hysteretic behavior and bearing capacity Strength, deformation, ductility, stiffness degradation and energy dissipation and other seismic performance indicators. The results show that the use of highly ductile concrete to reinforce the joints can improve the failure modes of joints, improve the ductility and energy dissipation capacity of joints, and reduce the stiffness degradation. In the core area of the core, it extends to the beam by 1 times. Effective beam height The node reinforced with high-toughness concrete has the best carrying capacity, deformation and energy dissipation capability.