浮搁是传统木结构中柱脚的典型构造形式,在水平荷载作用下木柱易出现摇摆现象。木柱的摇摆行为表明浮搁柱脚节点具有半刚性特征,对木结构抵抗侧向荷载和维持整体稳定性具有重要作用。本文提出了一种摇摆木柱柱脚节点的建模方法,通过在柱脚布置一排轴向弹簧以模拟柱底-础石接触界面的受力状态。基于OpenSees平台建立对应数值模型,通过与精细化有限元模型及大量相关文献中实验数据进行对比,验证该建模方法的有效性。同时对影响该建模方法的部分因素进行分析,包括柱脚弹簧接触刚度、分布模式、弹簧数量及材料本构。研究结果表明,该建模方法对接触刚度相对不敏感,建议木柱有效受压深度为木柱半径以确定各弹簧单元接触刚度；三种分布模式均适用于该建模方法,弹簧单元的数量应不少于10个；对于高轴压比木柱,在建模过程中应采用考虑弹簧单元进入塑性的ElasticPP材料本构。

Floating shelf is a typical structural form of column base in traditional wood structure, and wood column is prone to swing under horizontal load. The rocking behavior of timber columns shows that the floating column base joints have semi-rigid characteristics, which plays an important role in resisting lateral load and maintaining overall stability of timber structures. In this paper, a modeling method of rocking wood column base joints is proposed. A row of axial springs are arranged at the column base to simulate the stress state of the contact interface between the column bottom and the foundation stone. The corresponding numerical model is established based on the OpenSees platform. The validity of the modeling method is verified by comparing with the refined finite element model and the experimental data in a large number of related literatures. At the same time, some factors affecting the modeling method are analyzed, including the contact stiffness, distribution mode, spring number and material constitutive of the column spring. The results show that the modeling method is relatively insensitive to the contact stiffness. It is suggested that the effective compression depth of the timber column is the radius of the timber column to determine the contact stiffness of each spring element. The three distribution modes are applicable to the modeling method, and the number of spring units should be no less than 10. For wood columns with high axial compression ratio, the ElasticPP material constitutive considering the spring element entering plasticity should be adopted in the modeling process.

TU366.2

国家重点基础研究发展计划（973计划）