钢纤维高强混凝土力学性能研究与动态抗侵彻性能模拟

发布时间：2018-02-28 03:01

本文关键词： 钢纤维混凝土力学性能影响因素动态模拟抗侵彻性能　出处：《南京理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：本文以高强度混凝土的制备原理为基础,采用具有高强度、高硬度的骨料,混凝土成型过程中采取合理的养护制度,充分发挥出硅灰、超细石英粉等火山灰活性材料在混凝土结构形成过程中的各种物理和化学反应,选用聚羧酸系高效减水剂以来确保钢纤维高强混凝土具备良好的工作性和和易性。同时,为得到最佳钢纤维高强混凝土的增强、增韧与阻裂效应,在基体中掺加不同长径比、体积率的短钢纤维。在不同的成型工艺和养护制度条件下,优选出最佳工艺方法,制备出具有低密度、低成本和高强度、高韧性等特点的钢纤维高强度混凝土材料。本文主要论述了钢纤维高强混凝土的增强原理和制备技术,介绍了超高强混凝土的力学性能特点及研究现状,概述了目前它的主要应用领域。采用XRD、SEM等现代理化分析方法,研究水热合成工艺下的水化产物的类型和水化物的微观形貌以及结构特征的影响,分析微观形貌与宏观力学性能的关系。此外,结合动态载荷作用下钢纤维高强混凝土的损伤与破坏机制理论,确定相关参数,选择合适的钢纤维混凝土的动态本构模型,利用ANSYS/LS-DYNA显式动力学分析软件对其进行动态力学性能分析,对钢纤维混凝土靶板的抗侵彻过程进行相关软件数值模拟,分析结果得到混凝土靶板的破坏形态、侵彻速度的影响等重要的侵彻参数和规律,对实际打靶试验起到指导作用。
[Abstract]:Based on the preparation principle of high strength concrete and adopting the aggregate with high strength and high hardness, a reasonable curing system is adopted in the forming process of the concrete to give full play to the silica fume. Various physical and chemical reactions of pozzolanic active materials such as ultrafine quartz powder in the process of concrete structure formation. Since polycarboxylic acid series superplasticizer is used to ensure that steel fiber high strength concrete has good workability and ease. In order to obtain the best reinforcement, toughening and crack resistance effect of steel fiber high strength concrete, the short steel fiber with different aspect ratio and volume rate was added to the matrix. Under different forming technology and curing system, the best process method was selected. Steel fiber high strength concrete materials with low density, low cost, high strength and high toughness were prepared. This paper mainly discusses the strengthening principle and preparation technology of steel fiber high strength concrete, introduces the characteristics of mechanical properties and research status of super high strength concrete, summarizes its main application fields at present, and adopts modern physicochemical analysis methods such as XRDX SEM. The effects of the types of hydration products and the micromorphology and structural characteristics of hydrates under hydrothermal synthesis were studied, and the relationship between micromorphology and macroscopic mechanical properties was analyzed. Combined with the theory of damage and failure mechanism of steel fiber high strength concrete under dynamic load, the relevant parameters are determined, and the appropriate dynamic constitutive model of steel fiber reinforced concrete is selected. The dynamic mechanical properties of steel fiber reinforced concrete (SFRC) target were analyzed by ANSYS/LS-DYNA explicit dynamic analysis software. The numerical simulation of the anti-penetration process of steel fiber concrete target was carried out. The failure pattern of concrete target was obtained. The influence of penetration velocity and other important penetration parameters and laws play a guiding role in the actual shooting test.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.572

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