全轻混凝土与HRB500钢筋粘结锚固性能试验研究

发布时间：2018-02-02 22:15

本文关键词： 全轻混凝土粘结性能锚固长度 HRB500　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：全轻混凝土是把普通混凝土中的石、砂用轻质的粗、细骨料代替,再加入胶凝材料、水混制而成且使其表观密度控制在1950 kg/m3以下的轻骨料混凝土。全轻混凝土具有轻质高强、保温隔音、工作性能较好、抗震性能优越等特点,特别适用地基承载力不足和抗震设防较高的地区,而且配制全轻混凝土可以利用页岩、粉煤灰、自然煤矸石、浮石等废料,有利于减少天然砂、石的使用和保护环境,其应用前景广泛。为促进全轻混凝土在土木工程中的应用,本文主要对全轻混凝土部分基本力学性能和其与HRB500钢筋的粘结锚固性能进行了研究,主要完成了以下工作:(1)在优化全轻混凝土配合比设计的基础上,探讨了水灰比、砂率、轻骨料强度及轻骨料是否预湿对立方体抗压强度的影响,并根据数理统计分析了全轻混凝土7d、28d的抗压强度间的比值以及其抗压强度分别与轴心抗压强度、劈裂抗拉强度的比值。(2)通过对试验结果的分析,系统总结了强度、保护层厚度、锚固长度、钢筋直径及配箍率等因素对钢筋全轻混凝土粘结锚固性能的影响规律,通过试验数据回归统计得到了钢筋全轻混凝土极限粘结强度关系式,并与试验锚固条件相同下的普通钢筋混凝土作了比较;利用钢筋内贴应变片法,探讨了钢筋与全轻混凝土间的粘结应力沿钢筋锚固长度的变化规律。(3)在构件可靠性分析的基础上,给出了不同强度等级下钢筋全轻混凝土粘结锚固长度的合理取值,并与规范设计值作了对比。结果表明按《轻骨料混凝土结构技术规程》JGJ 12-2006中规范值设计是偏于安全的。
[Abstract]:The whole light concrete is the stone in the ordinary concrete, the sand uses the light weight coarse, the fine aggregate to replace, then adds the cementing material. Lightweight aggregate concrete, which is made of water mixing and its apparent density is controlled below 1950 kg/m3, has the characteristics of light weight and high strength, insulation and sound insulation, good working performance and excellent seismic performance. It is especially suitable for areas where the bearing capacity of foundation is insufficient and anti-seismic fortification is relatively high, and the preparation of all-light concrete can make use of shale, fly ash, natural coal gangue, pumice and other wastes, which is helpful to reduce natural sand. The use of stone and the protection of environment, its application prospect is extensive. In order to promote the application of all-light concrete in civil engineering. In this paper, the basic mechanical properties of whole light concrete and its bond and anchoring behavior with HRB500 steel bar are studied. On the basis of optimizing the mix design of total lightweight concrete, the effects of water-cement ratio, sand ratio, lightweight aggregate strength and weight aggregate prewetting on cube compressive strength are discussed. According to the mathematical statistics, the ratio between the compressive strength and the axial compressive strength of the full light concrete for 7 days to 28 days is analyzed respectively. Through the analysis of the test results, the strength, the thickness of the protective layer and the Anchorage length are systematically summarized. The influence of the diameter of steel bar and the ratio of hoop on the bond anchoring performance of reinforced full light concrete is studied. The relationship between ultimate bond strength of reinforced full light concrete is obtained by regression statistics of test data. And compared with the common reinforced concrete under the same anchoring condition. Based on the reliability analysis of members, the variation of bond stress between steel bar and light concrete along the length of reinforcement Anchorage is discussed by means of strain gauge method. The reasonable Anchorage length of all light reinforced concrete under different strength grades is given. The results show that it is safe to design according to the specification value of JGJ 12-2006 according to the Technical Specification for lightweight aggregate concrete structures.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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