Moisture risk assessment of cross-laminated timber walls: Perspectives on climate conditions and water vapor resistance performance of building materials

Chang, Seong Jin; Wi, Seunghwan; 강석구,; Kim, Sumin

doi:10.1016/j.buildenv.2019.106502

Cited by 26 publications

(15 citation statements)

References 26 publications

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“…The price of plywood is lower than solid wood in the Asian market; thus, Ply-lam has advantages in terms of production cost. Moreover, the dimensional stability and thermal conductivity of Ply-lam was better than typical CLT [24][25][26][27], and fire-retardant treated plywood can be used for fire resistance improvement. The structural characteristic of Ply-lam under out-of-plane bending was also investigated [28], but the withdrawal resistance of screws in Ply-lam needs to be investigated to provide a reasonable design method.…”

Section: Introductionmentioning

confidence: 98%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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The aim of this study was to predict the withdrawal resistance of a screw in hybrid cross-laminated timber (CLT) composed of two types of lamina layers. A theoretical model to predict the withdrawal resistance was developed from the shear mechanism between a screw and the layers in hybrid CLT. The parameters for the developed model were the withdrawal stiffness and strength that occurs when a screw is withdrawn, and the penetration depth of a screw in layers of a wood material. The prediction model was validated with an experimental test. Screws with two different diameters and lengths (Ø6.5 × 65 mm and Ø8.0 × 100 mm) were inserted in a panel composed of solid wood and plywood layers, and the withdrawal resistances of the screws were evaluated. At least 30 specimens for each group were tested to derive the lower 5th percentile values. As a result, the developed model predictions were 86–88% of the lower 5th percentile values of hybrid CLT from the properties of the lamina layer. This shows that the withdrawal resistance of hybrid CLT can be designed from the properties of its layer.

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Section: Introductionmentioning

confidence: 98%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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“…The moisture behaviour of CLT was studied repeatedly: starting with the moisture content of materials at the stage of building construction [25][26][27] to the moisture management and monitoring in mass timber buildings [28]. Based on these studies, the problems to be addressed in CLT were identified:…”

Section: Introductionmentioning

confidence: 99%

Moisture Risk Analysis for Three Construction Variants of a Wooden Inverted Flat Roof

Sadłowska-Sałęga

Wąs

2021

Energies

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The paper presents an analysis of the hygrothermal performance of an inverted flat roof with a CLT (cross-laminated timber) structure in a building that meets the requirements of Passive House Standard (PHS) with regards to the potential risk of moisture. The calculations were made in the WUFI®Plus and WUFI®Bio software. The following variants were taken into account: three structure configurations, three different external climates and different scenarios of microclimate control and air change rate. The results of the calculations show that, especially in cooler climates, there is an actual moisture risk in the structure despite the excellent thermal insulation. The structure of the inverted flat roof, due to the use of a tight membrane on the outer side, allows for the partition to discharge the excess moisture only to the inside of the building. Ensuring the comfort of users may require periodic humidification of internal air, which translates directly into an increase in moisture content of the structure. The performed analysis clearly showed that there are no universal solutions. It is important to point out that for the proper performance of inverted wooden roofs, it is crucial to analyse moisture, not only thermal and energy parameters.

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“…Plywood panels were used in cross-layer and have advantages in terms of production cost because the price of plywood is often lower than solid wood. The dimensional stability and thermal conductivity of Ply-lam were better than typical CLT [7][8][9][10]. The structural characteristics of Ply-lam under out-of-plane bending and the withdrawal resistance of screws in Ply-lam was investigated [11,12], but the structural performance for shear walls have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

et al. 2021

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In this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.

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Moisture risk assessment of cross-laminated timber walls: Perspectives on climate conditions and water vapor resistance performance of building materials

Cited by 26 publications

References 26 publications

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Moisture Risk Analysis for Three Construction Variants of a Wooden Inverted Flat Roof

Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

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