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为了提高梁柱节点受剪承载力、变形能力及耗能能力,同时避免节点钢筋拥挤而导致的施工困难,采用纤维增强混凝土(FRC)代替普通混凝土作为节点核心区基体材料,考虑轴压比和节点核心区配箍率的影响,进行了7个FRC梁柱节点和1个钢筋混凝土(RC)梁柱节点对比试件的拟静力试验,分析其破坏形态、承载力、变形能力、耗能能力、节点核心区剪应力-剪应变曲线和梁端塑性铰区弯矩-转角曲线。结果表明,在节点核心区主斜裂缝出现前,试件已具有很高的受剪承载力和变形能力;当轴压比试验值为0.07~0.28时,随着轴压比增大,FRC试件的受剪承载力、侧向变形能力、耗能能力及节点核心区的剪切强度和剪切变形能力增加;增加节点核心区配箍率,承载力退化有所减缓;FRC试件梁端塑性铰转动能力有较大提高。
In order to improve the shear bearing capacity, deformation capacity and energy dissipation capacity of the beam-column joints, and to avoid the construction difficulties caused by the crowded nodes, FRC is adopted as the core material in the core of the joint. Considering the axial compression ratio and The influence of the stirrup ratio in the core area of the joint was studied. The quasi-static tests of seven FRC beam-column joints and one reinforced concrete (RC) beam-column joint were carried out. The failure modes, bearing capacity, deformation capacity and energy dissipation Capability, shear stress-shear strain curve in the core region of the node and bending moment-corner curve in the plastic hinge zone at the beam end. The results show that the specimen has high shear capacity and deformation capacity before the main oblique cracks appear in the core of the joint. When the axial compression ratio is between 0.07 and 0.28, as the axial compression ratio increases, the FRC The shear capacity, lateral deformation capacity, energy dissipation capacity and the shear strength and shear deformation capacity of the core in the joints increase with the increase of the stirrup ratio and the degradation of the bearing capacity of the joints. The beam end Plastic hinge rotation capacity has been greatly improved.