Lateral strength of nailed timber connections with decay

Sawata, Kei; Sasaki, Yoshihisa

doi:10.1007/s10086-018-1734-8

Cited by 14 publications

(9 citation statements)

References 12 publications

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“…Figure 1 shows a sketch of the I-section, whereas Figure 2 shows the sketch of the Box-section. The fact that safety and serviceability are indispensable functions of a structure which are quite dependent on the stiffness and strength of the kind of connection employed especially in timber structures is key and consequential (Sawta and Sasaki 2018). These built-up sections were formed exclusively with the use of steel nails in accordance to specifications by BS 5268-2: 2002; for distance between adjacent nails in any one line parallel to the grains (without pre-drilled holes).…”

Section: Materials and Methodologymentioning

confidence: 99%

Comparative reliability assessment of a solid, box and I-section Nigerian-grown African birch (Anogeissus leiocarpus) timber column

Wilson

Adedeji

Alomaja

et al. 2020

International Wood Products Journal

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A structural reliability analysis was carried out on the Nigerian-grown African birch timber to ascertain its performance as a structural timber column for solid, box and I built-up sections using FORTRAN language. By varying its depth, length and the axial load supported by the column, results obtained reveal that the timber is adequate for use as solid timber column at a depth and breadth of 150 mm, an effective height of 3600 mm and an axial load of 260 kN with its probability of failure as 8.85 × 10 −3 . The corresponding I-section was found to be unsafe, whereas the box-section supported the design load with a probability of failure of 1.6 × 10 −6 . For the design dimension (150 × 150 mm), the solid section has a compressive capacity twice that of the I-section. The box-section has a capacity three times that of the I-section and twice that of the solid section at increased loads.

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Section: Materials and Methodologymentioning

confidence: 99%

Comparative reliability assessment of a solid, box and I-section Nigerian-grown African birch (Anogeissus leiocarpus) timber column

Wilson

Adedeji

Alomaja

et al. 2020

International Wood Products Journal

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“…Even at the earliest phases of fungal decay, the wood's mechanical strength drops dramatically. 29 Regarding the examination of the dynamic analysis of damaged wood structures, Sawata et al 30 investigated the impact of decay fungus on the various shear properties of pin joints. The joints damaged by brown rot fungus were found to have considerably decreased initial stiffness, yield load, maximum load, and reduced wood mass loss.…”

Section: Fpfs-typed Column-foot Jointmentioning

confidence: 99%

“…Thus, wood deterioration may develop locally. Even at the earliest phases of fungal decay, the wood's mechanical strength drops dramatically 29 …”

Section: Introductionmentioning

confidence: 99%

Floating column mechanism experimental investigation in historic timber buildings subjected to decay for seismic resilience

Chen,

Zhai,

Chen

et al. 2023

Structural Design Tall Build

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SummaryTraditional wooden structures are characterized by the presence of a column base that seems to be floated above the foundation stone. This study used pseudo‐static experiments to assess the seismic performance of flat pendulum floating resting columns, focusing on the decay and repair of the wood frame (WF). First, an artificial method was used to simulate fungal decay damage of column‐foot joints, and filling reinforcement was applied to the decayed column‐foot joints, and second, according to the design method in the Sung dynasty architecture, the Ying‐tsaofa‐shih (building standards). This study presents the findings of pseudo‐static tests that were conducted at Yangzhou University. Three 1:3.52 scaled specimen WFs with flat‐pendulum‐floating‐shelf (FPFS)‐typed (Ping‐bai‐fu‐ge) columns, i.e., non‐damaged WF (named after NT), considering the damaged WF (named after DF) and strengthening damaged WF (named after DR) with one‐way straight mortise‐tenon joints (OWSMT) joints were made and subjected to cyclic lateral loads during testing. The properties of the WFs with FPFS columns, such as the failure mode, hysteretic and envelope curves, strength and stiffness deterioration, and energy dissipation, have been studied. Finally, the effects of additional damage and reinforcement measures on the seismic performance of WFs are analyzed and compared with the finite element numerical simulation results. This research shows that damage to the column foot decreases the WF's seismic performance, although filler reinforcement may increase it. The foot and mortise joints are interconnected and interact in the wood frame's seismic stressing mechanism. Foot decay reduces the seismic performance of the foot joint, hence increasing the seismic energy dissipation activity of the mortise joints.

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“…The third method is described in ASTM D5652-21 [27] (referred to as OSM). Although the method is for bolted joints, it was also applied to nailed joints [28]. To determine the yield load, a straight line was fitted to the initial linear portion of the load-displacement curve.…”

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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Lateral strength of nailed timber connections with decay

Cited by 14 publications

References 12 publications

Comparative reliability assessment of a solid, box and I-section Nigerian-grown African birch (Anogeissus leiocarpus) timber column

Comparative reliability assessment of a solid, box and I-section Nigerian-grown African birch (Anogeissus leiocarpus) timber column

Floating column mechanism experimental investigation in historic timber buildings subjected to decay for seismic resilience

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

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