覆面板钉连接的承载性能试验研究

通过对60个采用国产圆钉制作的轻型木结构覆面板钉连接试件进行单调加载和单向反复加载试验,研究了钉连接的刚度退化和承载力变化规律.试验结果表明,除个别试件的覆面板断裂破坏外,绝大部分钉连接试件皆以Mc1屈服模式破坏,符合欧洲木结构设计规范钉连接计算对应的屈服模式;覆面板主方向与规格材木纹夹角对钉连接的承载性能有一定影响,但这种影响随试件放置时间的增长而减小;试件放置时间增长导致钉连接承载力和刚度下降;单向反复加载使钉连接刚度退化,而承载力略有提高,但随着反复加载次数的增加,两者都趋于稳定.通过对试验数据统计分析,得到了考虑退化的钉连接刚度计算公式.

Experimental Study of Behaviour of Panel-to-Lumber Nail Connections in Light Wood Frame Construction

Totally 60 specimens of panel-to-stud nail connections were designed and manufactured.Tests of the specimens both under monotonic loading and cyclic loading were conducted.Except for a few specimens that failed due to rupture of the structural panel,most nail connections failed following yield mode M-c1,which was consistent with Eurocode 5-Design of timber structures.The angle between the panel orientation and the grain of dimension lumber affects the performance of nail connections to some extent,while with the increasing of the conditioning time,the effect decreases and eventually become negligible.The load-carrying capacity and stiffness of nail connections decrease with the conditioning time.The load-carrying capacity of the nail connections increases slightly under cyclic loading,whilst the stiffness decreases,and both of them tend to be stable after a number of cycles of loading.A formula to evaluate the stiffness of the nail connections considering the stiffness degeneration is obtained from statistics of the experimental results.