鉄筋コンクリートアーチの耐力特性に関する解析的分析コンクリートの引張強度と形状初期不整が耐力に与える影響

摘要

Ultimate strength of wide roof-type shallow arches of reinforced concrete is discussed for pin support at both ends under vertical loads. The method considers the effects of not only initial geometric imperfections but also the tensile strength of concrete. The effect of sectional shape is included; a flat plate section and a curved section like a spherical surface. The results reveal that the ultimate strength of curved section is larger Irian that of flat section, the ultimate strength under uniform load is not reduced so much only if there are no geometric imperfection, however, the ultimate strength is largely reduced due to geometric imperfections and anti-symmetric vertical loads, and this tendency is much amplified in case of no concrete tensile strength, and followed by a suggestion that strength against earthquake forces should be studied for shallow arches to be built in area with high seismicity.%スパンLx＝35．5m，アーチ厚岸25cmの中規模で偏平な屋根型RCrnアーチに関して，断面形状，形状初期不整，コンクリートの引張強rn度，逆対称荷重不整をパラメータとして，耐力と形状初期不整敏感rn性を検討した。限定した構造モデルに関する結果ではあるが，以卜rnに得られた知見をまとめる。