不锈钢管海砂混凝土轴压力学性能研究

发布时间：2018-08-18 19:11

【摘要】：不锈钢具有耐久性好,抗腐蚀性强,塑性和韧性好,抗火性能优良,外表美观及维修费用低等特点,因此可作为高性能钢材用于工程结构中。用海砂代替河砂制备混凝土,可达到节省自然河砂资源并保护河床及两岸生态环境的效果,但不锈钢造价高昂,而海砂中高含量的氯离子易致钢材腐蚀、破坏混凝土结构,限制其推广应用。在不锈钢管中浇筑海砂混凝土可形成不锈钢管海砂混凝土,可大大减少不锈钢用量来降低工程造价,且核心海砂混凝土的支撑作用可改善薄壁不锈钢管的稳定性,另一方面核心海砂混凝土在不锈钢管的约束和保护下,可有效限制海砂对构件的腐蚀,从而使海砂不经处理的应用于土木工程中。本文采用试验研究和有限元模拟相结合的方法研究不锈钢管海砂混凝土轴压,具体进行了以下几个方面的工作:(1)综述了国内外与本文相关课题的研究现状,包括海砂混凝土性能、不锈钢材料性能、钢管混凝土轴压性能和不锈钢普通河砂混凝土轴压的力学性能等,说明本文采用的研究方法和研究内容。(2)进行了 48个轴压不锈钢管海砂混凝土试件试验研究,以含钢率、截面形式、混凝土强度、界面尺寸、核心混凝土类型为主要参数,考察其对不锈钢管海砂混凝土轴压力学性能的影响规律。(3)分别用四种不同规范上的设计计算公式计算不锈钢管海砂混凝土轴心受压承载力,再与试验所得实测数值比较分析,讨论在不同规范里普通钢管混凝土轴心受压承载力设计计算公式对于不锈钢管海砂混凝土的适用性。(4)通过合理的选择不锈钢材料以及核心混凝土材料的本构关系基础上,用有限元软件对部分不锈钢管海砂混凝土轴压构件的破坏形态、变形、荷载—位移曲线等进行全过程模拟。
[Abstract]:Stainless steel has the characteristics of good durability, strong corrosion resistance, good plasticity and toughness, excellent fire resistance, beautiful appearance and low maintenance cost, so it can be used as high performance steel in engineering structures. Using sea sand instead of river sand to prepare concrete can save natural river sand resources and protect ecological environment of riverbed and banks. However, the cost of stainless steel is high, and the high content of chloride ion in sea sand can easily lead to steel corrosion and destroy concrete structure. Limit its popularization and application. Pouring sea sand concrete into stainless steel tube can form sea sand concrete of stainless steel tube, which can greatly reduce the amount of stainless steel to reduce the project cost, and the supporting function of core sea sand concrete can improve the stability of thin-walled stainless steel pipe. On the other hand, under the restraint and protection of stainless steel pipe, the core sea sand concrete can effectively limit the corrosion of sea sand to the components, thus making the sea sand untreated in civil engineering. In this paper, the method of combining experimental research with finite element simulation is used to study the axial compression of stainless steel tube sea sand concrete. The following works are carried out: (1) the current research situation of the related topics at home and abroad is summarized. Including the properties of sea sand concrete, stainless steel material, concrete filled steel tube under axial compression, and the mechanical properties of stainless steel plain river sand concrete, The research methods and contents used in this paper are explained. (2) 48 specimens of stainless steel tube sea sand concrete under axial compression are studied. The main parameters are steel content, section form, concrete strength, interface size and core concrete type. The influence of this method on the axial compression mechanical properties of stainless steel tube sea sand concrete was investigated. (3) the axial compressive capacity of stainless steel tube sea sand concrete was calculated by four different design formulas, and the results were compared with the measured values. This paper discusses the applicability of the design formula of the axial compressive bearing capacity of ordinary concrete-filled steel tubular (CFST) under different specifications to stainless steel tube sea sand concrete. (4) on the basis of reasonable selection of the constitutive relation of stainless steel material and core concrete material, The failure mode, deformation and load-displacement curve of the partially stainless steel tubular sea sand concrete axial compression members were simulated by finite element software.
【学位授予单位】：福建农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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