(中铁建恒诚实业有限公司, 珠海 519030)

摘要: 新型梁柱榫卯节点是一种能够进行标准化生产、装配化施工、实现木结构建筑全榫卯连接的新型节点形式. 通过使用机械臂对该榫卯节点进行自动化加工制作,从而实现该类榫卯木结构建筑的工业化生产、智能化建造. 为了探究该新型节点的受力性能,对其十字形梁柱榫卯节点进行单调加载试验,研究该节点的承载能力、破坏模式、刚度以及变形性能. 采用数值模拟的方法对榫卯节点进行仿真分析,所得模拟结果与试验结果吻合较好.研究结果表明:节点榫头主要横纹受压,受力屈服后变形明显,而卯口顺纹受压变形较小,节点最终破坏形式为榫头拔出,在薄弱截面处发生弯曲破坏,柱身和梁身基本完好. 在此基础上,建立了单梁组成的 T 形梁-柱节点精细化有限元分析模型,研究梁柱节点中榫头朝向对节点初始刚度、强度以及延性的影响. 结果表明,榫头凹面朝下初始刚度较大,可以有效提高节点的强度和延性.

关键词: 木结构; 榫卯节点; 单调加载试验; 承载能力

中图分类号:TU366. 2 文献标志码:A 文章编号:1002-848X(2023)08-0125-07

DOI:10. 19701 / j. jzjg. 20211288

Monotonic loading experimental study on new type of wooden beam-column mortise-tenon joint

LIU Long

(China Railway Jianheng Honesty Industry Co. , Ltd. , Zhuhai 519030, China)

Abstract: The new beam-column mortise-tenon joint is a new type of joint which can carry out standardized production,assembly construction and realize full mortise-tenon connection of wooden structure buildings. By using the robotic arm toautomatically process the mortise-tenon joints, so as to realize the industrial production and intelligent construction of suchmortise-tenon wooden structure buildings. In order to explore the mechanical performance of the new joint, a monotonicloading test was carried out on the cross beam-column mortise-tenon joints to study the bearing capacity, failure mode,stiffness and deformation performance of the joint. The numerical simulation method was used to simulate the mortise tenonjoints, and the simulation results are in good agreement with the experimental results. The results show that the jointsmortise are mainly subjected to transverse tenon compression, and the deformation is obvious after yielding under force,while the deformation of the mortise is small along the grain. The final failure mode of joints is that the tenons are pulledup, bending failure occurs at the weak section, and the column and beam are basically intact. On this basis, a refinedfinite element analysis model of T-shaped beam-column joints composed of single beams was established to study theinfluence of mortise orientation on initial stiffness, strength and ductility of the joint. The results show that the initialstiffness of the tenon concave downwards is larger, which can effectively improve the strength and ductility of the joint.

Keywords:wooden structure; mortise-tenon joint; monotonic loading test; load-bearing capacity

作者简介:刘龙,硕士,高级工程师,主要从事建筑工程领域技术与管理,Email:1169968422@ qq. com.

[引用本文] 刘龙. 新型梁柱榫卯节点单调加载试验研究[ J]. 建筑结构,2023,53 ( 8):125-131. LIU Long.Monotonic loading experimental study on new type of wooden beam-column mortise-tenon joint[ J]. Building Structure,2023,53(8):125-131.