纤维混凝土板抗弯性能的试验研究毕设论文.doc

大学本科毕业设计（论文） 纤维混凝土板抗弯性能的试验研究 Investigation on the Flexural Performance of Fiber Reinforced Concrete Plates 大连理工大学毕业设计（论文）格式规范 纤维混凝土板抗弯性能的试验研究 -  PAGE II - -  PAGE I - 摘 要 混凝土具有抗压强度高、原材料容易获得、成本相对低廉、易成型、施工相对简便、经久耐用等优点，但普通混凝土抗拉强度低，且随着强度的增大，脆性也明显增大，在受荷时往往呈现出无明显征兆的脆性破坏，极大地影响了混凝土的实际工程应用，将纤维掺入到混凝土中能够明显提高混凝土的抗拉强度，通过阻碍混凝土内部微裂缝的产生和发展增强混凝土的韧性。 韧性是衡量纤维混凝土开裂后承载性能的重要指标, 也是纤维混凝土较之素混凝土的优点体现之一。韧性可定义为材料或结构从开始出现裂缝到失效为止吸收能量的能力。纤维混凝土的韧性包括压缩韧性、弯曲韧性、剪切韧性等，目前广泛采用弯曲韧性作为衡量纤维混凝土韧性的主要指标，其破坏过程更能综合反映出纤维的增韧效果。 目前对纤维混凝土（FRC）弯曲韧性的研究主要以纤维混凝土梁（150 mm×150 mm×550mm）为研究对象，但是梁式模板的内部空间狭小，影响了纤维在混凝土基体中的方向及自由分布，从而导致纤维混凝土试验梁与实际工程中纤维方向和分布存在一定程度的差异。本试验参照梁式构件的RILEM弯曲韧性试验方法，通过不同纤维类型、不同纤维掺量的纤维混凝土板（600 mm×600 mm×100mm）的弯曲韧性试验，总结出了纤维对混凝土基体增强增韧作用的部分规律。 关键词：纤维；纤维混凝土板；弯曲韧性 纤维混凝土板抗弯性能的试验研究 -  PAGE 86 - Investigation on the Flexural Performance of Fiber Reinforced Concrete Plates Abstract Concrete has many outstanding adva1ntages, such as high compressive strength, easy available raw materials, low energy consumption, relatively cheap and easy to shape, relatively simple for construction, high durability and so on. However, the tensile strength of concrete is really very low, and as the strength increased, the brittleness of concrete increased significantly. So when loaded, the concrete often shows brittle fracture with no obvious signs. That influenced the practical engineering application of concrete greatly. The fibers blended into concrete can significantly improve the tensile strength of concrete. Through resisting the emergence and development of the internal micro-cracks in concrete, fibers can improve the crack resistance and the toughness of concrete. The toughness is an important indicator for the workability of fiber reinforced concrete, and it is one of advantages of fiber reinforced concrete over plain concrete. Toughness can be defined as the capacity of energy absorption of material or structure from loading to failure. The toughness of fiber reinforced concrete includes compression tough