Effective lateral resistance of timber–plywood–timber joints connected with nails

Wanyama, Okumu Gordon; Sawata, Kei; Hirai, Takao; Sasaki, Yoshihisa

doi:10.1007/s10086-012-1250-1

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…5a) lacked deformability; therefore, the broken line did not intersect with the load-deformation relationship. The authors tried to use the perfect elasto-plastic model as another authorized method, which replaces the load-deformation relationship with bi-linear composed of elastic line (proportional line starting from original point) and horizontal line starting from the end of the elastic line, to obtain the yield [16][17][18][19], but it failed because some specimens did not show the clear maximum load due to the testing setup.…”

Section: Characteristicsmentioning

confidence: 99%

Embedment properties of Japanese cedar (Cryptomeria japonica) treated with resin impregnation

2022

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To strengthen the embedment properties of wood, this study applied the resin impregnation technique, which fills the resin into wood cells. The urethane prepolymer and acrylic monomer were selected in this study. A mechanical test by a round steel bar loaded to the wood specimen was conducted. The characteristics showed higher values in the resin-impregnated groups than in the control specimen group, especially in the stiffness. The urethane- and acryl-impregnated group showed 3.78 and 2.27 times the stiffness values of the control groups in the parallel-loaded condition, and 1.94 and 1.24 times those of the control group in the perpendicularly loaded condition, respectively. Although the stiffness was significantly increased, there was a lack of ductility, which seems to be a serious problem for construction application.

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Section: Characteristicsmentioning

confidence: 99%

Embedment properties of Japanese cedar (Cryptomeria japonica) treated with resin impregnation

2022

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“…The first was a perfect elasto-plastic model (EPM) [13,21]. Although this method was originally proposed for analyzing wood-frame structures, there are many examples of researchers applying it to joint analyses [22][23][24][25]. The method for determining the yield load is illustrated in Fig.…”

Section: Yield Loadmentioning

confidence: 99%

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

2022

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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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“…7 and 8). The model is used for evaluating the characteristics values of structural elements including timber joints [15][16][17][18]. The method for obtaining the characteristics values is explained below and Fig.…”

Section: Characteristics Valuesmentioning

confidence: 99%

Experimental study of lateral resistance of bolted joints using Japanese cedar (Cryptomeria japonica) treated with resin impregnation

Ogawa

Fukuta²,

Kobayashi

2020

J Wood Sci

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The development of wooden joints possessing high resistance performance has become an important issue for the construction of newer buildings. This study attempts to strengthen the lateral resistance of bolted joints using the previously reported plasticizing technique. This technique consists of two processing stages: incising the surface of the wood using an ultraviolet wavelength short-pulse laser and impregnating the resin into the incised area. This technique makes it possible to plasticize only a local part of the wood surface. Bolted joint specimens were assembled using plasticized wood around the bolt hole, and the lateral tests were conducted. Acrylic monomer and urethane prepolymer were used as the impregnating resins and their incision depths were set as 4 and 10 mm. When the lateral load acted parallel to the grain, changes in the lateral resistance characteristics were observed, especially for the stiffness and yield load. For example, when acryl was used, and the incision depth was 10 mm, an increment of 73% in the yield load was observed, as compared to the non-impregnated specimens. The specimen groups impregnated with acryl exhibited greater changes in their properties than those using urethane. When loaded perpendicular to the grain, an increase in properties were observed; however, these increments were lower than those of the groups loaded parallel to the grain.

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Effective lateral resistance of timber–plywood–timber joints connected with nails

Cited by 10 publications

References 2 publications

Embedment properties of Japanese cedar (Cryptomeria japonica) treated with resin impregnation

Embedment properties of Japanese cedar (Cryptomeria japonica) treated with resin impregnation

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

Experimental study of lateral resistance of bolted joints using Japanese cedar (Cryptomeria japonica) treated with resin impregnation

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