自充填混凝土由於具有良好之流動性，在國內外的研發與應用實例普受重視，本論文旨在探討自充填混凝土梁在配置高撓曲鋼筋量及承受低扭矩作用下，受到彎矩(M)、剪力(V)與扭矩(T)組合載重之承力行為，經由試驗方法，探討梁在T/M＝1/10及1/8條件下扭矩對撓曲強度及韌性之折減效應，實心斷面試體與空心斷面試體之差異性，與試體表面主應變之變化。

　　本研究共規劃10根斷面尺寸為250×350mm之自充填混凝土梁矩形斷面試體，主要變數為扭矩和彎矩比例值(T/M)及實心與空心斷面等。

　　主要研究結果如下：(1)實心試體之實測開裂強度與Collins的預測值之比值約為1.28~1.29倍，而空心試體則約為0.8～0.9倍，(2)實心試體之實測極限強度與Elfgren的預測值的比值約1.09～1.13倍，而空心試體則約為1.07~1.08倍，(3)試體達極限階段時，頂面混凝土之主張應變會隨著T/M比例值的增加而增大，而隨著主張應變的增加，頂面混凝土之極限主壓應變值將因此而下降。(4)依據試驗結果，在相同縱向鋼筋量下，實心試體與空心試體之撓曲強度會隨著T/M比值的增加而遞減，實心試體約有10~13％之遞減，而空心試體約有5～10％之遞減，(5)以Collons之理論預測開裂強度時，實心試體SCC梁與NC梁試驗值與理論值之比值為1.28與1.27倍，空心試體SCC梁與NC梁之比值為0.80與0.94倍；與Elfgren之極限強度理論值比較，SCC梁與NC梁之比較結果約略相同，但均高於理論值，因此SCC梁可達到試驗設計之強度要求。

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