十字木枋支承柱脚节点空间受力性能及损伤研究  

Spatial mechanical properties and damage analysis of column foot joints with cross intersected timber beams

作　　者：吴亚杰 宁雨欣 谢启芳[1,3] 张利朋 王明谦 WU Yajie;NING Yuxin;XIE Qifang;ZHANG Lipeng;WANG Mingqian(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China;School of Civil Engineering and Transportation,Northeast Forestry University,Harbin 150040,China;Shanghai Research Institute of Building Sciences Co.,Ltd,Shanghai 200032,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]东北林业大学土木与交通工程学院,黑龙江哈尔滨150040 [4]上海市建筑科学研究院有限公司,上海200032

出　　处：《建筑结构学报》2025年第4期153-164,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(52108284,52178303);陕西省重点研发计划(2024SF-YBXM-627)。

摘　　要：十字木枋支承柱脚节点空间受力性能与多层古建筑木结构地震响应密切相关。采用基于试验验证的十字木枋支承柱脚节点有限元建模方法,开展不同方向加载下十字木枋支承柱脚节点转动性能分析,揭示节点空间受力性能和损伤模式的差异性,并提出节点简化空间力学模型。研究表明:十字木枋支承柱脚节点的受力性能和损伤模式与竖向荷载、转动方向和转动角度有关;在转动初始阶段,节点绕任意方向的转动刚度相近;随着转动角度的增加,竖向荷载较小的节点空间受力性能差异最为明显;相对绕木枋纵轴转动,与木枋纵轴成45°加载下节点弯矩可降低27%,且更易出现木枋嵌压损伤;随着竖向荷载增大,节点空间受力性能差异性逐渐减小,节点绕木枋纵轴转动更易产生损伤。提出的节点简化空间力学模型与有限元分析结果吻合良好,可用于多层古建筑木结构空间受力性能分析。The spatial mechanical properties of column foot joints with cross intersected timber beams(CFJCITBs)contribute significantly to the seismic responses of multi-story ancient timber structures.In this paper,a finite element modelling method for CFJCITBs was adopted and validated using existing experiments.Rotational analysis of the CFJCITBs under different loading directions was conducted.The differences in the spatial mechanical properties and damage modes were indicated.A simplified spatial model was further proposed.The research indicates that the spatial mechanical properties and damage modes of the CFJCITBs are related to the vertical compression,the rotation direction and angle of rotation.During the initial rotation stage,the rotational stiffness of the CFJCITBs along different rotation directions is close.With the increase of the rotation angle,the differences in the spatial mechanical property of the CFJCITBs with smaller vertical load are more remarkable.Compared to those of the joints around the longitudinal axes of the timber beams,the joint moment under 45°loading to the longitudinal axes of timber beams is decreased by 27%and the timber beams are prone to embedment damage.With the increase of the vertical load,the difference in spatial mechanical property is reduced and the joints are more easily damaged around the longitudinal axes of the timber beams.The proposed simplified model agrees well with the finite element simulation results,and therefore the model could be utilized in spatial analysis of multi-story traditional timber structures.

关 键 词：多层古建筑木结构 十字木枋 柱脚节点 空间力学性能 损伤 

分 类 号：TU366.2[建筑科学—结构工程] TU311.41