本文旨在探討鋼筋混凝土梁在低扭矩作用下受到彎矩(M)、剪力(V)及扭矩(T)組合載重作用下之承力行為，隨著扭矩之增加對試體在整體承力行為之差異性。本研究共規劃10根斷面尺寸為250*350mm，長度分別為1.5 m及2.1m之鋼筋混凝土梁，主要考慮變數為扭矩和彎矩組合載重比例值T/M=0、1/10與1/8及實心斷面與空心斷面試體。

　　主要研究結果如下：(1)實心斷面與空心斷面試體之扭矩開裂強度實測值與Collins的預測式所得到之開裂強度的比值平均數分別為1.27與0.94，此結果表示以Collins預測式來預測實心試體略為保守，但對空心斷面試體而言理論值則較接近實驗值； (2)以Elfgren預測式來預測對實心或空心斷面試體之扭矩及彎矩極限強度皆有不錯的效果，比值平均數約為1.03~1.08；(3) 試體之強度與韌性會隨扭矩的增加而減少，1.5m的梁在T/M比值由0、1/10 及1/8增加時，實心斷面試體之極限撓曲強度約折減10~14%，空心斷面試體折減約為9~15%，撓曲韌性方面，實心與空心斷面試體在T/M比值由1/10增加至1/8時的折減情形分別為36%與52%。 (4) 當試體達極限階段時，頂面混凝土之主張應變會隨T/M比值增加而增加，並根據混凝土受到雙軸向應力的觀念，試體的頂面混凝土之極限主壓應變值會隨 比值的增加而下降。

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