提出一种牛腿榫头搭接连接梁柱节点,该节点由预制柱和预制梁组成,其中预制柱柱身预留一段端部设置牛腿的短梁,预制梁端部预留榫头,牛腿与榫头截面均小于梁,截面收缩处外伸出钢筋连接段.安装时,预制柱与预制梁通过牛腿榫头搭接,钢筋通过直螺纹套筒机械连接,可以实现梁柱节点的快速安装与施工.为验证所提出节点的承载力和抗震性能,对一个现浇梁柱节点和一个牛腿榫头搭接连接梁柱节点进行了1/2缩尺的拟静力加载试验.试验结果表明:牛腿榫头搭接连接梁柱节点破坏发生于搭接区域,其承载力和耗能能力强于现浇梁柱节点,但延性相对较弱.在试验基础上进行有限元分析,模拟结果和试验结果基本吻合,验证了模型的准确性.最后,对牛腿榫头搭接连接梁柱节点进行了有限元参数分析,分析结果表明:牛腿尺寸、牛腿箍筋直径和柱纵筋直径对节点的滞回曲线和骨架曲线并无明显影响,节点承载力随牛腿纵筋直径减小而减小,节点承载力和初始刚度随梁纵筋直径增大而显著增大.
A precast lap beam-column joint with a corbel and tenon configuration is proposed. A short beam equipped with a small corbel in the lower section was placed on the column surface to create a lap connection with the beam. Accordingly, the beam was designed with a section-reduced tenon in the upper section at the end of the lap connection. Mechanical sleeves were used to connect the reinforcement rebar between the beam and joint. To verify the bearing capacity and seismic performance of the proposed frame joint, quasi-static tests were performed on two 1/2-scaled frame joint specimens that were produced with a normal reinforcement concrete（RC） frame configuration and a special corbel-tenon configuration. The results showed that the failure of the corbeltenon specimen mainly occurred in the connection region and that its bearing capacity and energy dissipation capacity were better than those of the RC specimen, whereas its ductility was lower. Based on the experimental results, a finite element analysis was performed,and it achieved good agreement with the experimental results. Finally, a finite element parameter analysis of the lap beam-column joint with corbel and tenon configurations was performed. The analysis results show that the corbel size, corbel stirrup diameter, and column longitudinal reinforcement diameter have no significant effect on the hysteresis or skeleton curves of the joint. The bearing capacity of the joint decreases with a decrease in the diameter of the longitudinal reinforcement of the corbel, and the bearing capacity and initial stiffness of the joint increase significantly with an increase in the diameter of the beam longitudinal reinforcement.
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