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对钢筋混凝土框架顶层L形边节点及T形中节点的抗震性能进行了试验研究。根据节点裂缝特征、荷载-变形滞回曲线、梁柱纵筋应变曲线及节点核心区周围诸力分布特点等试验结果,分析了节点的各种破坏模式及不同破坏模式对节点强度的影响。比较了中日两国规范节点强度设计值与试验结果的吻合性。结果表明:在满足节点内构件纵筋锚固充分的前提下,L形节点在梁柱相对关闭方向的传力机构为扇形斜压杆机构,难以被“剪压”坏,节点抗剪强度在混凝土圆柱体抗压强度的0.2倍以上;张开方向的节点强度由受弯传力机构决定,节点强度为关闭方向的0.7倍左右。T形节点的抗剪强度在混凝土圆柱体抗压强度的0.2倍左右,梁筋在节点内粘结性能的显著衰减使节点强度低于├形中间层边节点。
The seismic performance of L-shaped edge nodes and T-shaped nodes in the top of reinforced concrete frame was studied. Based on the experimental results of joint crack characteristics, load-deformation hysteresis curve, beam-column longitudinal reinforcement curve and the distribution of forces around the core zone, the effects of various failure modes and different failure modes on node strength are analyzed. The coincidence between the design strength of the normative joint between China and Japan was compared with the test results. The results show that under the premise of satisfying the anchoring of the longitudinal ribs of members in the joints, the force transmission mechanism of L-shaped joints in the direction of beam-column relative closing is a fan-shaped bar linkage mechanism, which is hard to be damaged by The compressive strength of concrete cylinder is more than 0.2 times; the strength of the node in the open direction is determined by the force-transmitting mechanism, and the node strength is about 0.7 times of the closing direction. The shear strength of T-shaped joints is about 0.2 times of the compressive strength of concrete cylindrical bodies, and the significant attenuation of the bonding performance of the tendons in the joints makes the joint strength lower than that of the ├-shaped middle edge.