本文旨在探討普通和自充填鋼筋混凝土梁受到彎矩(M)、剪力(V)和扭力(T)之組合載重作用下的行為差異，本研究規劃了10根斷面尺寸為250×350mm，長度分別為1.5及2.1米的鋼筋混凝土梁，混凝土抗壓強度約35MPa，主要探討的變數為三種扭矩和彎矩的比例(T/M=0、1/10、1/8)、兩種扭矩和剪力的比例(1.5米，2.1米試體)，及兩種斷面(空心、實心)，另外取用前年學長所作的同強度普通鋼筋混凝土梁試體之結果進行變形以及韌性方面的比較。
主要的研究結果如下：
1. 對於空心的梁加載之T/M為1/10時，空心斷面梁的撓曲韌性在T/M＝1/10時，明顯的比T/M＝0之情況有明顯少，在SCC系列為61.1％，NC系列為53.4%。對於實心的梁，SCC系列的韌性減為66.3％，亦即少許的扭力會大量影響構件的撓曲韌性，一般規範常忽略此影響，有待進一步探討。
2. SCC梁的韌性表現比NC梁較佳，惟當加載T/M比增加之後，SCC與NC梁的韌性差異會接近。在相同T/M比例下，剪力小的試體，SCC梁的韌性比NC梁試體來的好。
3. 在混凝土抗壓強度相同之狀況下，無論是實心試體或空心試體，SCC試體極限強度與NC試體相近，SCC試體的開裂強度稍高於NC試體。
4. 比較不同試體的四面主張應變，發現承受扭力的試體之主張應變會比較大，導致試體之混凝土軟化快，此為承受扭力之試體，韌性差的主因。

This research is to compare the behaviored of ordinary and self- compacting reinforced concrete beams subjected to the combined loading of bending, shear and torsion.
In the experimental work, we tested ten reinforced concrete beams with the identical section size of 250×350mm, the concrete compressive strength is 35MPa. Two types of beam length, 1.5 and 2.1m was used. The main variables include the ratio of torsion to bending, torsion to shear, and the solid and hallow sections. The results of previous study were used for comparisons.
The main results of our research are as follows:
(1)For hollow section beams, lesser flexural ductility was found in those with T/M=1/10.For those made of SCC concrete, the reduction is about 61.1%, Where those made of NC concrete is about 53.4% . For solid section the reduction of flexural ductility in SCC specimens is about 66.3%.(2)SCC specimens had better ductility than NC specimens the ratio of torsion to bending increases.The difference in here pronounced as ratio of torsion to bending increase.(3) For specimens having the same concrete compressive strength , no matter solid or hollow section, the ultimate strength of SCC specimens were very close to NC specimens. (4)Comparing the principal tensile strain in four sides of a cross section, specimens subjected to torsion had higher principal tensile strain, which had to the series softening in concrete. This verifies the fact that specimens subject to torsion had lesser flexural ductility.

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