VARIATION OF LOAD-SLIP BEHAVIOR IN NAILED JOINTS - VARIATION PARALLELTO THE GRAIN

There were 1,088 single-nail tension tests carried out on 109 spruce d ouble-shear specimens in order to analyze the variation of load-slip b ehavior of non-pre-drilled nailed connections. The following load-slip parameters were determined from each test: maximum load. elastic slip modulus, initial slip modulus, and slip modulus according to ISO 689 1, as well as the three parameters of a function fitted to the load-sl ip relationship. Tests with nails penetrating a knot in the main or a side member resulted in a 20 percent increase in maximum load and elas tic slip modulus. The autocorrelation of the parameters of the load-sl ip behavior as well as their mutual correlation are independent of nai l distance in the range of 73 to 657 mm.