伝統的木造建築物の茅葺屋根解体過程における振動性状の変化に関する研究

概要

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On Japanese traditional timber structures, the structural performance of vertical diaphragm has been studied by many researchers. On the other hand, there are few studies about the structural performance on horizontal diaphragm. It is important to study structural performance on horizontal diaphragm to evaluate structural characteristics of a structure whole in three dimensionally. We had a chance to carry out vibration measurements for a traditional wooden structure called "Nagayamon" which was going to be dismantled and moved to the other site. The Nagayamon has five vertical frames and two ones with mud-plastered walls in span and lateral directions, respectively. The object of this study is to evaluate the effect of the thatched roof system mainly on its horizontal rigidity through changes in vibration characteristics for the Nagayamon being dismantled. Microtremor and free vibration measurements were carried out and the predominant frequencies and free vibration modes were obtained for each phase during dismantling the Nagayamon. As the results, it was found that the vibration characteristics clearly changed before and after dismantling the thatched roof. This means that the thatched roof system is effective to unify vertical frames with mud-plastered walls in the structure.
一般社団法人日本建築学会の論文
2008-03-25