Bracing effect mechanism in the collapse of timber-frame houses due to earthquake and snow weight

概要

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In this study, a simulation procedure with which the collapse mechanism of a timber-frame house can be traced was developed using the 3-dimensional distinct element method (3D-DEM). The collapse phenomenon of timber-frame houses due to both earthquake and the weight of snow on roofs was simulated, and the effect of diagonal bracing in preventing structures from collapsing was examined. Timber-frame houses with structural elements (columns, beams, floors, foundations, roofs, and diagonal braces) were modeled. The 3D-DEM program was developed introducing rectangular parallelepiped, hexahedral and octahedral elements in order to model these structural elements, and the process of detecting contact between the elements was simplified and made computationally efficient. The difference in collapse behavior between structures that have no diagonal braces, few braces, and many braces was compared using the developed program. The simulated results showed that installing diagonal braces is effective in preventing structures from collapsing due to both earthquake motion and snow weight on roofs. The proposed procedure contributes to providing people with a better understanding of the necessity of repair and reinforcement to avoid catastrophic disaster in coming earthquakes.
日本自然災害学会の論文