大断面横架材を有する2スパン伝統木造軸組の耐震要素配置と力学特性

摘要

本論では，大断面横架材である差鴨居の有無，配置高さをパラメータとして，1スパン試験体2体と，2スパン試験体2体(差鴨居を対称配置した架構，段違い配置した架構)について静的水平加力実験を実施し，差鴨居配置や接合部形状が架構全体の力学特性や破壊性状へ与える影響を把握した。また，嵌合型接合部を簡易な解析モデルで表し，シミュレーションを通じて精度検証を行った。最後に，差鴨居の配置に着目した感度解析を行った。%This paper presents the results of static cyclic loading tests and simulation analysis for four types of traditional wooden frames in order to understand the seismic performance of frames with uneven large section beams(Sashigamoi)and to clarify the influence of the beams and shapes of fitting-type joints on the behavior of the whole frame. Major findings are as follows:(1)In the static loading tests, two-span frames underwent column splitting or column breaking more readily and with smaller deformation than in the case of one-span frames. In addition, the shear forces exhibited directional dependence, which is attributed to the asymmetry of the frames or the shapes of the column-beam joints. (2)A method for modeling traditional fitting-type joints was developed, and analysis results were in good agreement with the test results. (3)Based m parametric studies, the smaller the beam height distance, the smaller the difference in the restoring force with the loading direction.