Effect of Exposure to Elevated Tempeture on Dowel Bearing Strength of Mass Plywood Panels

Dillard, Alexander; Ho, Tu X.; Indra, Aaryan; Sinha, Arijit

doi:10.22382/wfs-2021-27

Cited by 3 publications

(13 citation statements)

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“…Statistical modeling is based on multiple linear regression (MLR), while analytical modeling tries to discern the underlying causes using first-order kinetics. These predictive models were used for thermal degradation of bending properties in wood composites (Sinha et al 2011b(Sinha et al , 2011c(Sinha et al , 2012Sinha 2013) and then expanded to thermal degradation of wood-sheathing nailed connection (Akgul and Sinha 2016;Sinha et al 2018), bracket connection of cross-laminated timber (Mahr et al 2020), and dowel bearing strength of MPP (Dillard et al 2021). Both models showed good predictive results for thermal degradation.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Thus, it is extremely important to know the strength of the materials and connections so that performance simulations can be carried out and rehabilitation plans can be designed (Akgul and Sinha 2016). Since MPP is a relatively new mass timber material, Dillard et al (2021) is the only study that was found on the effects of elevated temperature on MPP performance. A total of 198 specimens were fabricated for the dowel bearing test.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The experimental results showed that the dowel bearing strength of MPP degraded at higher temperature and longer exposure durations. MLR and kinetics-based predictive models for dowel bearing strength were also applied in Dillard et al (2021).…”

Section: Literature Reviewmentioning

confidence: 99%

“…MPP is a relatively new product, so there have been limited studies on mechanical properties and structural connection performance (Miyamoto et al 2020;Soti et al 2020Soti et al , 2021Dillard et al 2021;and Ho et al 2022). One of the knowledge gaps is the performance of MPP connections under exposure to elevated temperatures (thermal effect), which is important for both the design of new structures in terms of fire resistance and the rehabilitation of structures partially damaged by fire.…”

mentioning

confidence: 99%

“…This study presents an experimental investigation on strength and stiffness degradation of nailed connections of MPP after exposure to elevated temperatures. The test results were compared with a prediction based on the results of a previous study reporting dowel bearing strength degradation (Dillard et al 2021). Moreover, two analytical models were developed to predict the MPP connection's strength and stiffness degradation.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Investigation of Thermal Effects on Nailed Connection of Mass Ply Panels

Ho¹,

Laughery²,

Sinha³

2022

Forest Products Journal

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Mass ply panels (MPP), a relatively new mass timber product, has been utilized in several construction projects as diaphragm and wall panels. Connection for MPP is a crucial structural component that requires a better understanding. This article presents an experimental investigation into elevated temperature exposure–driven property degradation of MPP nailed connections, which is important for both the design of new structures in terms of fire resistance and the rehabilitation of structures partially damaged by fire. One control group and 32 exposure groups, which were combinations of eight elevated temperatures and four exposure durations, were investigated. The failure modes and yield strength of the nailed connection were analyzed as a function of elevated temperature and exposure time and compared with the prediction from the National Design Specification and existing literature. The results show a decrease of up to 45 percent in initial stiffness and ultimate load; meanwhile, there was no statistical evidence for the change in yield load in the majority of testing groups. Two analytical models, namely, multilinear regression and first-order kinetics model, were proposed to model the degradation of initial stiffness and ultimate strength. The kinetics model provided a better prediction and suggested that the initial stiffness and ultimate strength of the nail connection degraded over time at rates depending on the exposure temperature.

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