中文摘要：

该文通过三点弯曲试验,研究了不同水胶比的高延性纤维增强水泥基复合材料（PVA-ECC）的抗弯性能。实验结果表明,水胶比对PVA-ECC的抗弯性能影响显著。随着水胶比的降低,抗弯强度增大,但梁的延性下降。水胶比由0.35降为0.25时,抗弯强度和延性均有突变。水胶比大于0.35时,水胶比对抗弯强度和延性的影响没有水胶比小于0.35时影响显著。与普通混凝土材料相比,梁的抗弯强度和延性均有明显提高。普通混凝土梁在达到峰值荷载后,承载力迅速下降,而PVA-ECC梁在达到峰值荷载后,有一段平缓的延性段,承载力下降缓慢,延性增加明显。

英文摘要：

The behavior of PVA fiber reinforced engineered cementitious composite（PVA-ECC） under bending load is investigated through experiments.The test results show that the water to cementitious material ratio（W/C） has a significant influence on the bending performance of PVA-ECC.The bending strength increases with the reduction of W/C while the ductility of the beam decreases.As the W/C varies from 0.35 to 0.25,both bending strength and ductility have a sudden change.When W/C is higher than 0.35,the influence of W/C on the bending strength and the ductility is smaller than that when W/C is lower than 0.35.The bending strength and ductility of PVA-ECC are greatly improved compared with the normal concrete.The abrupt drop of the load-displacement curve after ultimate load of concrete in bending is eliminated and replaced by a slowly decreasing stage in PVA-ECC.