木结构螺栓连接的力学性能分析  

Mechanical performance analysis of bolted connections for timber structures

作　　者：王笑婷 牛爽[2] 祝恩淳[2] WANG Xiaoting;NIU Shuang;ZHU Enchun(School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China)

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]哈尔滨工业大学海洋工程学院,山东威海264209

出　　处：《南京工业大学学报（自然科学版）》2021年第3期372-380,398,共10页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点研发计划(2017YFC0703505)。

摘　　要：木结构中螺栓连接具有半刚性特性,连接性能对结构的力学性能影响显著。为解决螺栓连接初始刚度的计算问题,本文基于弹性地基梁理论推导出连接刚度的计算方法。弹性地基梁理论中的地基模量对应于木材的销槽承压刚度,本文对樟子松和东北落叶松销槽承压试验结果进行回归分析,通过全干相对密度和销直径两个变量,提出顺纹和横纹受力下的销槽承压刚度经验公式。结果表明:螺栓连接试验所得初始刚度与计算值吻合良好,验证了弹性地基梁理论刚度计算方法的正确性和适用性。试验结果表明承载能力极限状态下的螺栓连接刚度约为初始刚度的2/3,与欧洲规范Eurocode 5的相关规定相符。本文提出的螺栓连接荷载位移曲线数学模型可为整体结构的抗侧性能分析提供依据。The mechanical performance of timber structures is significantly influenced by the bolted connections because of their semi-rigidity.In order to calculate the initial stiffness of the bolted connections,the method based on the beam-on-elastic-foundation theory is proposed.The foundation modulus in the beam-on-elastic-foundation theory corresponds to the dowel-bearing stiffness of wood.Empirical formulae for calculating dowel-bearing stiffness,both parallel and perpendicular to grain,are obtained by regression analysis of the dowel-bearing test on Pinus sylvestris var.mogonica and Larix gmelini(Rupr.)Rupr.,in which two variables:specific gravity and dowel diameter are considered.Test results show that the initial stiffness of bolted connections correlated closely with the calculation values,which verifies the validity and the feasibility of the stiffness calculation method.Test results also show that the stiffness at ultimate limit is about 2/3 of the stiffness at serviceability limit,the same as that in Euro-code 5.The analytical model of load-displacement relationship of bolted connections is proposed in the paper,which provides reliable basis for the analysis of lateral performance of timber structures.

关 键 词：木结构 螺栓连接 销槽承压刚度 弹性地基梁 

分 类 号：TU366.2[建筑科学—结构工程]