T形截面钢管混凝土组合柱-钢筋混凝土梁加强环筋连接节点抗震性能试验研究

发布时间：2018-05-24 19:58

本文选题：框架边节点 + T形截面钢管混凝土组合柱　；参考：《建筑结构学报》2016年08期

【摘要】：在传统外加强环节点的基础上,提出一种T形截面钢管混凝土柱-钢筋混凝土梁加强环筋节点。以牛腿长度、环筋直径和环筋设置方式为主要参数,设计了7个节点试件,并通过静力和拟静力试验,探讨了试件的破坏特征、受力和抗震性能。研究结果表明:设置环筋的试件表现出典型混凝土梁端塑性铰破坏,未设置环筋的试件破坏源于牛腿翼缘与管壁间焊缝撕裂,呈脆性破坏;屈服前梁端纵筋承担了绝大部分弯矩,并通过环筋和牛腿实现了弯矩和剪力在梁柱间的可靠传递;带环筋试件滞回曲线呈饱满的弓形,而无环筋试件滞回环捏拢严重,呈耗能能力很差的Z形;各试件承载力退化趋势基本一致,且均出现明显刚度退化,具有相似的割线变化规律;节点域剪切变形对结构变形的影响几乎可以忽略不计;加大牛腿长度能显著提高节点初始刚度与极限荷载,小直径环筋在往复荷载作用下能够达到屈服,减少节点域环筋数量虽对初始刚度及耗能性能影响较小,但承载力却出现了一定幅度的降低。钢管混凝土组合柱-钢筋混凝土梁加强环筋节点抗震性能良好,能够实现"强节点弱构件"的抗震设计目的。
[Abstract]:Based on the traditional external strengthening link, a T-section reinforced concrete filled steel tubular column reinforced concrete beam reinforced ring reinforcement joint is proposed. Taking the length of the corbel, the diameter of the ring reinforcement and the setting mode of the ring reinforcement as the main parameters, seven joint specimens are designed. Through static and quasi-static tests, the failure characteristics, stress and aseismic behavior of the specimens are discussed. The results show that the specimens with ring tendons show plastic hinge failure at the end of typical concrete beams, and the failure of specimens without ring tendons is caused by the tearing of the welding seam between the corbel flange and the pipe wall, which is brittle failure. The longitudinal tendons at the end of yield bear most of the bending moment, and the bending moment and shear force are transferred reliably between the Liang Zhu by the ring reinforcement and the corbel, the hysteretic curve of the specimen with the ring tendons is full and the hysteretic loop of the specimen without the ring reinforcement is serious, the hysteretic curve of the specimen with the ring reinforcement is full, but the hysteresis loop of the specimen without the ring reinforcement is very serious. The bearing capacity of each specimen is basically the same, and there is obvious stiffness degradation, which has the similar law of Secant variation, and the effect of shear deformation in the node domain on the deformation of the structure can be almost ignored. The initial stiffness and ultimate load of the joint can be improved significantly by increasing the length of the corbel, and the small diameter ring reinforcement can yield under reciprocating load, and the reduction of the number of ring reinforcement in the joint domain has little effect on the initial stiffness and energy dissipation performance. However, the bearing capacity has been reduced to a certain extent. Concrete-filled steel tubular composite column-reinforced concrete beams have good seismic performance and can achieve the purpose of seismic design of "strong joints and weak members".
【作者单位】：武汉理工大学土木工程与建筑学院;武汉理工大设计研究院有限公司;
【基金】：湖北省自然科学基金项目(2012FFB05112)
【分类号】：TU398.9;TU352.11

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