基于摇摆与剪切协同的柱脚叉接木框架抗侧荷载-位移曲线模型

榫卯连接木框架是传统木结构中的基本承力构件，研究表明其在竖向和水平荷载共同作用下具有摇摆和剪切两种抗侧机制。文章综合考虑木框架摇摆与剪切变形，根据变形协调和弯矩平衡条件，推导竖向荷载和水平荷载共同作用下，柱脚叉接榫卯连接木框架抗侧荷载-位移关系的曲线模型，提出木框架抗侧弹性极限荷载点、峰值荷载点及其切线刚度和下降段刚度的计算方法。基于叉接柱脚木框架抗侧试验对模型进行验证，结果表明：理论模型与试验结果吻合较好，模型计算结果误差小于15.5%。理论研究成果对于传统木结构抗震性能分析和设计具有参考价值。

Lateral load-displacement curve model for column foot-forked timber frames based on rocking and racking coordination

Mortise-tenon jointed timber frames are basic load-bearing elements in traditional Chinese timber structures. Previous research indicates that such frames are of rocking function and racking function to resist lateral loads under coupled actions of vertical and lateral loading. According to the conditions of deformation compatibility and moment equilibrium from rocking and racking, a curve model is proposed to explain the lateral load-displacement relationship of column foot-forked timber frames under vertical and lateral loading. The calculation methods for elastic limit load point, peak load pints and corresponding tangent stiffness as well as the descending stiffness are proposed. And the proposed model was verified by the test results of typical timber frames. It was found that the theoretical model agreed well with the experimental results with prediction error less than 15.5%. The research results can provide reference for the seismic performance analysis and structural design of traditional timber structures.