钢筋增强PVA纤维水泥基复合材料梁弯曲性能试验研究-结构工程专业论文.docxVIP

内蒙古工业大学硕士学位论文 内蒙古工业大学硕士学位论文 万方数据 万方数据 摘 要 在我国工程界，ECC 俗称可弯曲的混凝土。这种由改性有机纤维代替常规混凝 土里的粗骨料的全新理念，使得脆性混凝土可转变为具有超强韧性的材料——纤维 水泥基复合材料。具有不可估量的应用前景。 本文以 PVA 纤维水泥基复合材料为研究对象，以常用构件梁为研究载体，结合 国内外已有研究成果，主要完成了三部分内容： 其一，在同一配合比的基础上，制作不同纤维体积掺量、不同配筋率的 PVA 纤 维水泥基复合材料梁试件进行四点弯曲试验，得出荷载变形曲线，详细分析了试件 受力过程及影响因素分析；得出纤维水泥基复合材料与钢筋协调变形，试件底面开 裂对钢筋与纤维水泥基复合材料的粘结影响甚微。 其二，鉴于纤维对裂缝条数和宽度的贡献，详细阐述裂缝发展规律，得出裂缝 分布特点，对比 PVA 纤维水泥基复合材料与普通混凝土的裂缝形态，详细解释纤维 的阻裂作用。 其三，分析梁受弯破坏形态，根据现有理论研究考虑纤维的作用得出承载力计 算公式，平衡配筋率，最小配筋率的计算方法。 关键词：PVA 纤维，弯曲性能，裂缝形态，承载力计算，平衡配筋率 I  Abstract Civil engineering in our country, ECC is commonly known as bendable concrete. This is a new concept that use the modified organic fibers instead of coarse aggregate of conventional concrete, which makes the brittle concrete can be transformed into a super toughness materials - fiber cement-based composite materials. It has immeasurable prospect. In this paper, PVA fiber cement-based composite materials as the research object, the beam with commonly used components, combine with the existed research results at home and abroad. Mainly to complete the three parts: First, on the basis of the same mixture ratio, made different fiber volume content and reinforcement ratio of polyvinyl alcohol fiber cement-based composite materials long beam specimen to carry on the four-point bending test, it is concluded that the load deformation curve of specimen and stress process are analyzed in detail, meanwhile influence factors are analyzed. Drawn the conclusion that fiber cement base composite material and reinforced are deformed compatibility, The bottom of specimen’s cracking of reinforced with fiber cement-based composite materials have little effect in bonding Second, in view of the contribution of fiber on the number and width of cracks, cracks developed elaborate rules are in detail, it is concluded that crack distribution characteristics, fracture form are compared between polyvinyl alcohol fiber cement matrix composites and concrete, the role of fiber crack resistan