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This study aims to apply four-sided structural sealant glazing (SSG) systems in Japan. Therefore, the following points have been confirmed. Firstly, a thermal performance analysis by the boundary element method (BEM) regarding high thermal performance four-sided SSG was conducted, and its performance was quantified. Secondly, the adhesion of a specimen cut from an actual façade was evaluated and the durability of the structural adhesion was confirmed. This paper described the heat conduction analysis and experiments for an actual façade. In order to confirm that the thermal performance of four-sided SSG systems is higher than that for a conventional curtain wall, a two-dimensional steady heat conduction analysis using the BEM was performed. As a result, it was clarified that SSG systems are highly effective at inhibiting heat loss, and if it is associated with Low-E and includes a comparison with the single glass unit, a reduction in heat loss from 21 % up to 58 % may be realized. Also, as for the structural adhesion durability on an actual façade, this study evaluated the adhesive durability of four-sided SSG that was applied to a glass façade over 20 years ago. Structural sealant tension tests were performed using a specimen cut from the actual façade. The results of the tension test were compared with the initial data from over 20 years ago. The purpose of this experiment was to ensure the maximum tensile strength and structural properties. The results indicated that most of the specimens reached their maximum tensile strength at a strain reduction of 50 %. All of the specimens underwent cohesive failure and exhibited a similar tensile strength to the initial value from 20 years ago. However, the elongation at the maximum tensile strength was smaller than the initial value. Moreover, the stiffness was two times higher than the initial value. Therefore, the four-sided SSG system should be reconsidered as a method of evaluation for accelerating the aging test of present situation.
structural adhesion reliability, cutout from actual façade, tensile stress, stiffness, thermal performance, boundary element method analysis, U-value
Multidisciplinary Research Institute, LIXIL Corporation, Tokyo,