中文摘要：

实验研究了纤维对水泥基复合材料抗弯性能的影响。结果表明,聚乙烯醇（PVA）纤维增强挤压脱水成型板材在弯曲荷载作用下呈现多点开裂、应变硬化的特性,具有良好的延性,聚丙烯（PP）纤维增强挤压脱水成型板材呈应变软化的特性,木纤维增强挤压脱水成型板材则呈脆性破坏;与普通混凝土梁相比,冷浇和热浇纤维增强板-混凝土组合梁的抗弯强度和相应挠度均有较大提高,组合梁中复合材料层厚度的增加,组合梁的抗弯强度及相应挠度增大;与PP纤维相比,PVA纤维增强热浇组合梁的强度及对应挠度值都高,且当复合材料层的厚度达50mm时组合梁呈应变硬化特性。

英文摘要：

Different fibers were used to study their influences on the properties of fiber reinforced cementitious composites boards and beams.It was found that polyvinyl alcohol（PVA） fibers reinforced extruded dewatering board presents multiple cracking and strain hardening performance under bending load,and therefore has a good ductility.While,polypropylene（PP） fiber reinforced cement board presents single cracking and strain softening.Wood fibers reinforced cement board presents brittleness failure under bending load.Compared with the normal concrete beam,the fiber reinforced cement-concrete composite beam demonstrates better strength and ductility.The thicker the fiber reinforced cement layer,the better the properties of the beam.Compared with PP fiber,the bending strength and the corresponded deflection of PVA fiber reinforced composite beam are higher,and when the thickness of the fiber reinforced cement layer reaches 50mm,the beam displays strain hardening.