帯板形式の組立圧縮材の座屈と骨組の座屈の関連性について: Bleichの座屈荷重評価式の考察

摘要

帯板形式組立圧縮材の座屈荷重をBleichはエネルギ保存則をもとに導出している.また，チモシェンコは組立柱の座屈にはせん断変形を考慮する必要があるとし，せん断力のたわみに及ぼす影響を考慮した柱の釣合微分方程式の解をもとに，組立柱の弾性座屈荷重評価式を提示している.この評価式の検討や修正も行われている状況にある.%The objective of this study is to examine the relationship between battened built-up columns and frames about buckling. The buckling strengths, buckling modes and bending moment of one bay n stories frame with rigid beams are calculated by the energy method. The results are compared with those of obtained by the Bleich's formula and correct solutions. Although the buckling strengths by Bleich agree fairly well with the correct values, it is shown that the strengths by Bleich are neither the upper bound nor the lower bound. Moreover, Bleich's moment distributions correspond to those of obtained by the energy method.