基于摇摆与剪切抗侧协同工作机制的斗栱节点侧向荷载-位移模型

斗栱节点是传统木结构重要抗侧构件之一，在竖向和水平荷载作用下具有摇摆与剪切抗侧协同的工作机制。根据斗栱节点摇摆与剪切变形，基于斗栱节点的几何物理参数及木材力学性能参数，以及已有传统木结构抗侧构件荷载-位移骨架曲线表征方法，给出了斗栱节点在竖向荷载和水平荷载共同作用下抗侧弹性极限荷载点、峰值荷载点及其切线刚度的计算方法，从而建立了斗栱节点侧向荷载-位移关系的解析模型。基于单、双斗栱节点在不同竖向荷载作用下的水平低周反复加载试验结果，验证了模型预测结果的准确性。研究表明，斗栱节点侧向荷载-位移模型可以较好地反映在模型弹性段和上升段斗栱节点的工作状态，但对峰值荷载的估计偏于保守。

Lateral load-displacement model of dou-gong connections based on rocking and racking coordination mechanism

Dou-gong connections are one of the important lateral load-resisting elements in traditional timber structures, and exhibit both rocking and racking mechanisms under combined vertical and lateral loading. Based on the rocking and racking deformation, the geometrical and physical parameters, and the material properties of dou-gong connections, the elastic limit load point, the peak load point and the corresponding tangent stiffness of dou-gong connections were obtained by use of existing backbone characterization methods for traditional Chinese timber components. Based on this, an analytical model for the lateral load-displacement relationship of dou-gong connections was established. The results of low cyclic reversed loading tests of single and double dou-gong connections under different vertical loads were employed to verify the proposed model. It is found that the established model can predict the elastic stage and the ascending stage of dou-gong connections with reasonable accuracy, however may underestimate the peak load.