Comparison of the elastic limit and yield load of nailed joints connecting solid wood and wood-based board material

Abstract

Evaluations of the lateral properties of timber joints are necessary to ensure the safety of timber buildings. The yield load is an important property that is usually obtained using authorized engineering techniques. Although yield loads have been easily obtained using authorized techniques, events that have occurred in the joint during yielding have not been clarified. This study experimentally obtains elastic limit data using nailed joints. Mechanical tests measuring the residual displacement after various lateral loads with six-joint specimen specifications were conducted. In this study, the load at which the residual displacement reached 5% of the nail diameter was defined as the elastic limit. The experimentally obtained elastic limits were compared with the yield loads obtained using authorized engineering techniques. The ratios of elastic limits to the yield loads obtained using the perfect elasto-plastic model, method described in EN, and 5% offset method were 0.554–0.743, 0.557–0.834, and 0.648–0.801, respectively. The results numerically revealed that residual displacements occurred at a much lower load than the yield loads.

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“…The values for elastic, maximum specific shear, and tensile strength for PMP and BW were obtained from the average curves. According to Watanabe et al [27], the yield point is just greater than the elastic limit at the start of plastic deformation. Even though there are many methods for obtaining the yield point for wood, as described by [27] and also Ottenhaus et al [28], ASTM C273 suggests that the yield strength calculation of core materials with high elongation should use a 2% offset in terms of strain, but this offset is not suitable for PMP and BW, as the yield strength would be greater than the maximum strength.…”

“…According to Watanabe et al [27], the yield point is just greater than the elastic limit at the start of plastic deformation. Even though there are many methods for obtaining the yield point for wood, as described by [27] and also Ottenhaus et al [28], ASTM C273 suggests that the yield strength calculation of core materials with high elongation should use a 2% offset in terms of strain, but this offset is not suitable for PMP and BW, as the yield strength would be greater than the maximum strength. Therefore, the yield was obtained using a 1% offset in the shear curves, as in the work of Adibaskoro et al [29] for elasto-plastic wood material, and 0.5% offset in the tensile curves, as in the work of Da Silva and Kyriakides [30] for BW.…”

“…Watanabe et al [27] compared the elastic limit and the yield strength of four different woods and found that the former is much lower than the latter. With the offset method they obtained the elastic limit as 72.10% of the yield.…”