钢丝网约束混凝土轴压性能试验研究-防灾减灾工程及防护工程专业论文.docxVIP

混凝土是一种脆性材料，随着强度的提高，脆性表现的更为明显。国内外 学者对如何改善混凝土的脆性做了大量的研究工作，其中约束混凝土是减小脆 性的一种有效的方法。 由于钢丝网混凝土具有良好的配筋分散性，通过钢丝与混凝土之间的粘结 作用，在钢丝网作用范围内的混凝土均匀受力，因此钢丝网混凝土具有良好的 阻裂作用和韧性，其增强的混凝土是一种高延性和韧性的高性能材料。目前在 工程中主要应用于加固和一些薄壁结构。目前对于钢丝网约束混凝土受压状态 下的研究并不充分，因此提出了应用钢丝网约束混凝土的试验研究。 本文主要研究内容： 1．根据3组不同钢丝网搭接长度的钢丝网约束混凝土圆柱体试件的轴压试 验，根据试验结果获得合适的钢丝网搭接长度。 2．根据8组基体强度为C40和C60的试件在不同保护层厚度时的轴压性能 试验，研究保护层厚度对轴压性能的影响???得到合适的钢丝网保护层厚度。 3．根据6组基体强度为C40和C60的试件在不同长径比时的轴压力学性能 试验，研究长径比对钢丝网约束混凝土力学性能的影响。 4．通过14组钢丝网约束混凝土轴压性能试验，研究不同强度、截面形状、 钢丝网孔径及基体强度对混凝土力学性能的影响，并分析钢丝网约束混凝土的 受力状况和破坏形态。 5．在试验的基础上计算钢丝网约束混凝土的韧性，并尝试给出钢丝网约束 混凝土的应力．应变曲线方程。 关键词：钢丝网；约束混凝土；轴压性能；韧性；应力．应变曲线  ABSTRACT ABSTRACT Concrete is a brittle material，and with the strength improved，the brittleness of concrete performance more obviously．Domestic and forei印scholars on how to improve the brittleness of concrete have done a lot of research work，which reduces the brittleness of confined concrete are efficient way． As the steel wire reinforced concrete has good dispersion,by wire bonding between concrete role in the steel mesh within the concrete role of unifotin strength, the steel mesh concrete has good crack resistance effect and the toughness，the enhanced Concrete is a hilgh ductility and toughness of high-performance materials．Currently steel wire is mainly used in concrete reinforcement in engineering and some thin-walled structures．The state of confined concrete compression behavior by steel wire is not sufficiently,therefore，a study of steel wire confined concrete to improve the compressive behavior has been done． The main results in this dissertation are as follows： ^’ (1)Based on the testing results of 3 groups cylindrical specimen of steel wire confined concrete，which have different lap length of steel wire，suitable lap length was proposed． (2)Based on the testing results of 8 groups cylindrical specimen of marix strength C40 and C60，which have different protective thickness，the suitable thickness ofprotected was proposed． (3)Based on the testing results of 6 g