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A real scale evaluation method and results on termite resistance of housing wall systems and floor framings
1999 - IRG/WP 99-10314
For evaluating the termite resistance of real scale houses especially housing wall systems and floor framings, a experimental building was prepared. After initial feeding of termite, this house was constructed. In this experimental building, several parts which were built by different wall systems and floor framing. The room temperature of these parts were controlled. Water can be provided in the wall systems. Well termite installed feed log was inserted in each wall system. After 2 weeks, the difference of agregation can be observed. By this experimental building, the termite resistance of housing system can be classified.
K Suzuki, K Okada, K Hagio, Y Tanaka


Fire Safety of Wood Floor Assembly: Model and Full-scale Test
2007 - IRG/WP 07-20375
The present paper describes the model for the prediction of fire safety of wood floor assemblies. The model includes heat transfer model for the calculation of the flow of heat in floor assembly and structural model for the analysis of the mechanical performance of wood joists. The floor assemblies considered in this paper are constructed with nominal 2x10 (38x241mm) wood joists lined by Type X (or Type C) gypsum board (12.7mm or 15.9mm thickness, one layer or two layers) as a ceiling membrane, and 15.9mm thick plywood as a sub-floor. The heat transfer model employed two-dimensional heat conduction equation to predict the temperatures in the ceiling (gypsum board), wood joists and sub-floor (plywood) in the floor assembly, when the ceiling is exposed to fire. The structural model, using the temperature distribution in the joists predicted from the heat transfer model, calculated strength of the joists and deflection of joists based on the modulus of elasticity, moment of inertia and rigidity of joists to examine the mechanical performance of floor / ceiling assemblies. The results from the computer model were compared to the results from the full-scale tests. Reasonably good agreement was observed between the results from the model and those from the tests.
H Takeda


Evaluation of Particulate Materials as a Physical Barrier against Termites under Floor of Experiment House
2017 - IRG/WP 17-10900
In Japan, the damages by the subterranean termites (Coptotermes formosanus and Reticulitermes speratus) are more common. Recently the more attention is paid to the less- or non-chemical methods for termite control. As a non-chemical treatment, physical barriers using particles such as gravels were investigated in terms of environmental safety, cost effectiveness, and duration of performance, and the physical barriers using some particles have been practically used in a few countries except Japan. In this study, penetration of termites of R. speratus into seven physical barriers of different particulate materials such as pelletized stone powder, pelletized zeolite, crushed zeolite, calcite, crushed silica gel, silica gel beads, and glass beads, and sandy loam as a control, were investigated under the floor of experiment house for seven years. Layers with particles of pelletized zeolite (1.00 to 4.00mm in diameter), crushed zeolite (1.50 to 3.00mm), calcite (1.50 to 3.00mm), crushed silica gel (1.50 to 3.00mm), and silica gel beads (1.50 to 3.00mm) prevented termites from passing through. On the other hand, for all of the layers with particles passed through by R. speratus, only the penetrations at the corner part were observed, because of the gaps at the corner part where termites could pass through. It was considered that there were gaps at the corner part, since the wood stakes under the corner parts of the layer with particle was completely consumed by termites and the particles flowed into cavities.
Y Yanase, Y Fujiwara, Y Fujii, T Mori, T Yoshimura, S Doi


A Comparison of Cross-Laminated Timber (CLT) Floor Panels using Finite Element Analysis and Experimental Fire Testing
2022 - IRG/WP 22-40955
Cross-laminated timber (CLT) is a relatively new timber product and has gained popularity in North America and Europe as a construction material. As a sustainable engineered timber product, CLT offers many advantages over solid wood, concrete, or steel construction. However, the use of timber in medium to high rise buildings is often avoided mainly due to its combustible nature. In this paper, a numerical model of a CLT floor panel was developed using the Finite Element (FE) Method in Abaqus. This paper analyses the thermal behaviour of a CLT panel when exposed to a standard test fire. In the modelling of a CLT floor panel, Eurocode 5 temperature-dependent relationships were adopted. The results of the FE model were then compared with the experimental tests performed for a similar-sized panel. The charring rate and temperature distribution across the depth of the CLT panel were investigated for all test specimens and comparisons were made with the experimental results. The comparisons of FE results with experimental results showed that the FE analysis gave reasonably accurate results to allow for the development of full-scale computational models of a prototype CLT building.
M Yasir, A Macilwraith, K Ruane