摘   要：采用国产纤维制成的高性能水泥基复合材料（ECC）替代部分混凝土，形成受拉区部分为ECC的RC/ECC组合梁（RE梁），并与普通钢筋混凝土梁（RC梁）进行抗弯性能对比试验研究。结果表明，RE梁的破坏模式为受剪破坏，极限抗弯承载能力约为RC梁的1.35倍，平均最大跨中挠度约为RC梁的1.5倍；在加载过程中，RE梁的裂缝宽度随荷载的增长速率远远低于RC梁，裂缝数目多、间距小、宽度小。采用ECC替代20%梁高的受拉区混凝土可使梁获得较为优越的抗弯性能。

Abstract: In order to effectively improve the flexural capacity of reinforced concrete beams, an engineered cementitious composite (ECC) is introduced to partially substitute concrete in the tension zone of a reinforced concrete beam (RC beam) to form a reinforced/ECC concrete composite beam (RE beam). Experimental studies on flexural behaviors of RC beams and RE beams are carried out. The results show that the flexural capacity and the mid-span deflection are about 1.35 times and 1.5 times that of RC beams, respectively. In the process of loading，the crack width of RE beams with load growth rate is far lower than that of RC beam. Compared to RC beams，RE beams are demonstrated that superior performances in the number, the space, and the width of cracks. A depth ratio of 20% would be a proper parameter for designing ECC thickness of RE beams.