scholarly journals RESUMO DE TESE: MANIFESTAÇÕES PATOLÓGICAS EM HABITAÇÕES DE INTERESSE SOCIAL CONSTRUÍDAS COM O SISTEMA LIGHT WOOD FRAME NO SUL DO BRASIL

2021 ◽  
Vol 7 (4) ◽  
pp. 177-178
Author(s):  
Rodrigo Vargas Sousa ◽  
Lisiane Ilha Librelotto ◽  
Ângela Do Valle
Keyword(s):  
Wood Frame

Nos últimos anos vem crescendo o uso do sistema construtivo Light Wood Frame (LWF) no sul Brasil, principalmente, para construção de Habitações de Interesse Social (HIS). Assim este trabalho analisou o desempenho técnico-construtivo e as manifestações patológicas ocorrentes nas edificações no sul do Brasil. O método utilizado baseou-se em multimétodos, já consagrados nas áreas de Avaliação Pós-Ocupação (APO), engenharia diagnóstica e restauro das edificações. O método leva em consideração o ponto de vista dos especialistas (arquitetos, construtores e pesquisadores), mas também a satisfação dos usuários, para diagnosticar aspectos a corrigir das habitações estudadas. Foram utilizados procedimentos de inspeção tradicionais e elaboraram-se mapas de danos, ferramentas comuns no restauro de edificações. Os resultados apontam as principais manifestações patológicas ocorrentes nas Habitações de Interesse Social construídas com Light Wood Frame no Sul do Brasil.

A comparison of hygrothermal simulation results derived from four simulation tools

2021 ◽  
pp. 174425912098876
Author(s):  
Maurice Defo ◽  
Michael Lacasse ◽  
Abdelaziz Laouadi
Keyword(s):  
Relative Humidity ◽  
Outer Layer ◽  
Growth Index ◽  
Mould Growth ◽  
Simulation Tools ◽  
Assembly Design ◽  
Hygrothermal Simulation ◽  
Moisture Performance ◽  
Wood Frame ◽  
Wall Assembly

The objective of this work was to compare the hygrothermal responses and the moisture performance of four wood-frame walls as predicted by four hygrothermal (HAM) simulation tools, namely: DELPHIN, WUFI, hygIRC and COMSOL. The four wall systems differ only in their cladding type; these were fibreboard, vinyl, stucco and brick. Three Canadian cities having different climates were selected for simulations: Ottawa, Ontario; Vancouver, British Columbia and Calgary, Alberta. In each city, simulations were run for 2 years. Temperature and relative humidity of the outer layer of OSB sheathing were compared amongst the four simulation tools. The mould growth index on the outer layer of the OSB sheathing was used to compare the moisture performance predicted by the respective hygrothermal simulation tools. Temperature profiles of the outer layer of the OSB sheathing were all in good agreement for the four HAM tools in the three locations. For relative humidity, the highest discrepancies amongst the four tools were found with stucco cladding where differences as high as 20% could be found from time to time. Mould growth indices predicted by the four HAM tools were similar in some cases but different in other cases. The discrepancies amongst the different HAM tools were likely related to: the material property processing, how the quantity of wind-driven rain absorbed at the cladding surface is computed and some implementation details. Despite these discrepancies, The tools generally yielded consistent results and could be used for comparing the impacts of different designs on the risk of premature deterioration, as well as for evaluating the relative effects of climate change on a given wall assembly design.

Cyclic behavior of wood-frame shear walls with vertical load and bending moment for mid-rise timber buildings

2021 ◽  
Vol 240 ◽  
pp. 112298
Author(s):  
Paúl Orellana ◽  
Hernán Santa María ◽  
José Luis Almazán ◽  
Xavier Estrella
Keyword(s):  
Bending Moment ◽  
Shear Walls ◽  
Cyclic Behavior ◽  
Vertical Load ◽  
Wood Frame

scholarly journals Stochastic Simulation of Mould Growth Performance of Wood-Frame Building Envelopes under Climate Change: Risk Assessment and Error Estimation

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 333
Author(s):  
Lin Wang ◽  
Maurice Defo ◽  
Zhe Xiao ◽  
Hua Ge ◽  
Michael A. Lacasse
Keyword(s):  
Climate Change ◽  
Risk Assessment ◽  
Error Estimation ◽  
Ventilation Rate ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Mould Growth ◽  
Frame Building ◽  
Wood Frame ◽  
Water Tightness

Previous studies have shown that the effects of climate change on building structures will increase the mould growth risk of the wood-frame building envelope in many circumstances. This risk can be controlled by wind-driven rain deflection, improving water tightness of the exterior facade, and improving cladding ventilation. However, the effectiveness of these risk mitigation strategies are subject to various uncertainties, such as the uncertainties of wall component properties and micro-climatic conditions. The objective of this paper is to apply stochastic hygrothermal simulation to evaluate the mould growth risk of a brick veneer-clad wood-frame wall with a drainage cavity under historical and future climatic conditions of Ottawa, a Canadian city located in a cold climate zone. An extensive literature review was conducted to quantify the range of stochastic variables including rain deposition factor, rain leakage moisture source, cladding ventilation rate and material properties of brick. The randomised Sobol sequence-based sampling method, one of the Randomized Quasi-Monte Carlo (RQMC) methods, was applied for risk assessment and error estimation. It was found that, under the climatic condition of Ottawa, limiting the amount of wind-driven rain to which walls are subjected is a more robust mitigation measure than improving cladding ventilation in controlling mould growth risk, the improving of water tightness of exterior façade is not as robust as wind-driven rain deflection and cladding ventilation, however, the reduction of rainwater penetration can reduce the mould growth risk at different levels of rain deposition factor and cladding ventilation rate.

Wind Performance Enhancement Strategies for Residential Wood-Frame Buildings

2018 ◽  
Vol 32 (3) ◽  
pp. 04018024 ◽  
Author(s):  
Hassan Masoomi ◽  
Mohammad R. Ameri ◽  
John W. van de Lindt
Keyword(s):  
Performance Enhancement ◽  
Frame Buildings ◽  
Wood Frame

Experimental Seismic Collapse Study of a Full-Scale, 4-Story, Soft-Story, Wood-Frame Building

2015 ◽  
Vol 21 (2) ◽  
Author(s):  
Pouria Bahmani ◽  
John W. van de Lindt ◽  
Gary L. Mochizuki ◽  
Mikhail Gershfeld ◽  
Steven E. Pryor
Keyword(s):  
Full Scale ◽  
Soft Story ◽  
Frame Building ◽  
Seismic Collapse ◽  
Wood Frame

Performance of the Nail Joints on Wood Frame Shear Walls

2011 ◽  
Vol 255-260 ◽  
pp. 350-354
Author(s):  
Liu Yan ◽  
Xiao Jin Zou ◽  
Chen Gang She
Keyword(s):  
Shear Walls ◽  
Exponential Model ◽  
Modified Model ◽  
Wood Frame

The performance of two types of Chinese screw nails in connections between sheathing and wood frame was assessed using ASTM-F1575-03. Specimens were tested in groups of 10, and both parallel-to-grain and perpendicular-to-grain specimens were tested in the case of ASTM-F1676-03. It was found that the type of nail had little effect on the performance of nail joints. Finally a modified model suitable to domestic nails in two directions was established on the basis of Foschi’s exponential model. The model provides useful data on the performance of sheathing-to-lumber connections.

scholarly journals A State of the Art of the Overall Energy Efficiency of Wood Buildings—An Overview and Future Possibilities

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1848
Author(s):  
Matheus Roberto Cabral ◽  
Pierre Blanchet
Keyword(s):  
Energy Efficiency ◽  
State Of The Art ◽  
Energy Performance ◽  
Environmental Benefits ◽  
Embodied Energy ◽  
Future Research ◽  
Hybrid Buildings ◽  
Wood Frame ◽  
Mass Timber

The main goal of this study was to review current studies on the state of the art of wood constructions with a particular focus on energy efficiency, which could serve as a valuable source of information for both industry and scholars. This review begins with an overview of the role of materials in wood buildings to improve energy performance, covering structural and insulation materials that have already been successfully used in the market for general applications over the years. Subsequently, studies of different wood building systems (i.e., wood-frame, post-and-beam, mass timber and hybrid constructions) and energy efficiency are discussed. This is followed by a brief introduction to strategies to increase the energy efficiency of constructions. Finally, remarks and future research opportunities for wood buildings are highlighted. Some general recommendations for developing more energy-efficient wood buildings are identified in the literature and discussed. There is a lack of emerging construction concepts for wood-frame and post-and-beam buildings and a lack of design codes and specifications for mass timber and hybrid buildings. From the perspective of the potential environmental benefits of these systems as a whole, and their effects on energy efficiency and embodied energy in constructions, there are barriers that need to be considered in the future.

Lateral Load Performance of Panelized Wood I-Joist Floor Systems

2020 ◽  
Vol 70 (4) ◽  
pp. 428-438
Author(s):  
Sigong Zhang ◽  
Ying Hei Chui ◽  
David Joo
Keyword(s):  
Load Transfer ◽  
Mechanical Performance ◽  
Small Scale ◽  
Construction Time ◽  
Plane Shear ◽  
Floor Systems ◽  
Diaphragm Action ◽  
Wood Frame ◽  
Strength And Stiffness ◽  
Frame Construction

Abstract Panelized light wood frame construction is becoming more popular due to the faster construction time and shortage of onsite skilled labor. To use light wood frame panels effectively in panelized floor systems, panel-to-panel joints must be fastened adequately to allow load transfer between panels. They must also possess in-plane shear strength and stiffness comparable to stick-built, staggered-sheathed assemblies. This study was designed to develop efficient and effective panel-to-panel joints for connecting adjacent floor panels built with wood I-joists and evaluate the efficiency of the joints in achieving diaphragm action. At first, a number of these panel-to-panel joints were tested in the laboratory using a small-scale diaphragm test setup to determine their efficiency in transferring in-plane forces between panels. Test results showed that a small decrease in in-plane stiffness was expected for the most effective joints, but their strengths were significantly higher than at the same location in a conventional site-built floor diaphragm. The presence of blockings and use of two-row nailing were found to considerably improve stiffness and strength. These features can be used to mitigate the potential reduction in mechanical performance of panelized floor construction, in comparison with the site-built wood I-joist floor.

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