钢管珊瑚混凝土柱承载力试验和理论研究
发布时间：2019-04-26 01:46
【摘要】：随着海洋开发以及海洋权益的争夺，包括军事防护工程在内的海洋工程建设日益增多，对于远离大陆的岛礁工程来说，所需的各项材料均从遥远的大陆运输，其运输成本非常昂贵。钢管珊瑚混凝土构件因珊瑚混凝土原材料易获得，，早期强度高，施工方便等优点成为海洋开发项目的首选。但由于珊瑚的生活环境和结构特性决定其表面有大量氯离子附着，氯离子腐蚀成为制约其应用的首要问题，本文在理论分析的基础上，证明了珊瑚混凝土在钢管混凝土中应用的可行性。为方便工程实际应用，本文通过实验、理论和有限元相结合的方法，重点研究钢管珊瑚混凝土柱的承载力性能及延性性能，通过大量的数值分析，给出了钢管珊瑚混凝土柱轴压承载力计算公式，并计算了压弯构件的位移延性系数。 具体包括以下研究工作： 依据混凝土中钢材的腐蚀机理，通过理论分析得出腐蚀反应速率由氧气含量控制，通过极限分析方法计算不同截面形式的钢管珊瑚混凝土在不同腐蚀类型下的极限腐蚀厚度，并将计算结果与已有的实验结果进行对比。 以C30混凝土为基准混凝土，用珊瑚礁、砂全部替代混凝土中的粗、细骨料，分别对3组9个钢管珊瑚混凝土短柱进行了材性实验和轴压短柱实验，并对实验现象和结果进行分析。 用有限元软件ABAQUS对钢管珊瑚混凝土轴压过程进行模拟，并用实验结果进行验证；依据普通钢管混凝土统一理论，结合钢管珊瑚混凝土轴压短柱承载力试验和有限元数值分析，最终给出基于普通钢管混凝土统一理论设计法的钢管珊瑚混凝土柱承载力计算公式。 根据瑞利-里兹法和极限平衡理论进行了钢管珊瑚混凝土构件滞回性能的分析，修正了钢管素混凝土压弯构件荷载-位移曲线的骨架曲线模型，计算了压弯构件的位移延性系数，对比分析了钢管珊瑚混凝土与钢管普通混凝土延性差异的原因。
[Abstract]:With the development of the sea and the competition for the rights and interests of the sea, the construction of marine engineering, including the military protection project, is increasing day by day. For the islands and reefs far away from the mainland, all the materials required are transported from the distant continent. Its transportation costs are very expensive. Coral-filled steel tube (CFST) has become the first choice for marine development projects because of its advantages such as easy access to raw materials, high early strength and convenient construction. However, due to the living environment and structural characteristics of coral, there is a large amount of chloride ion adhesion on its surface, and chloride ion corrosion has become the primary problem to restrict its application. In this paper, on the basis of theoretical analysis, The feasibility of application of coral concrete in concrete filled steel tube is proved. In order to facilitate the practical application of the project, through the combination of experiment, theory and finite element method, this paper focuses on the bearing capacity and ductility of coral filled steel tube concrete columns, and through a lot of numerical analysis, The formula for calculating the bearing capacity of coral-filled steel tubular columns under axial compression is given, and the displacement ductility coefficient of the compression-bending members is calculated. The main contents are as follows: according to the corrosion mechanism of steel in concrete, the corrosion reaction rate is controlled by oxygen content through theoretical analysis. The ultimate corrosion thickness of coral-filled steel tube concrete (CFST) with different types of corrosion is calculated by the method of limit analysis, and the calculated results are compared with the existing experimental results. Taking C30 concrete as reference concrete, using coral reef and sand instead of coarse and fine aggregate in concrete, three groups of 9 concrete filled steel tube concrete stub columns were tested by material property test and axial compression stub column test, respectively. The experimental phenomena and results are analyzed. The axial compression process of concrete filled steel tube (CFST) was simulated by finite element software ABAQUS and verified by the experimental results. According to the unified theory of concrete filled steel tube (CFST), combined with the bearing capacity test and finite element numerical analysis of concrete filled steel tubular columns under axial compression, Finally, a formula for calculating the bearing capacity of coral-filled steel tube columns based on the unified theory design method of concrete-filled steel tubes is given. Based on Rayleigh-Ritz method and limit equilibrium theory, the hysteretic behavior of coral-filled steel tube concrete members is analyzed, and the skeleton curve model of load-displacement curves of steel tube concrete compression-bending members is modified. The displacement ductility coefficient of compression-bending members is calculated, and the reasons for the difference of ductility between coral-filled steel tube concrete and ordinary concrete-filled steel tube are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9;TU312.1
本文编号：2465646
[Abstract]:With the development of the sea and the competition for the rights and interests of the sea, the construction of marine engineering, including the military protection project, is increasing day by day. For the islands and reefs far away from the mainland, all the materials required are transported from the distant continent. Its transportation costs are very expensive. Coral-filled steel tube (CFST) has become the first choice for marine development projects because of its advantages such as easy access to raw materials, high early strength and convenient construction. However, due to the living environment and structural characteristics of coral, there is a large amount of chloride ion adhesion on its surface, and chloride ion corrosion has become the primary problem to restrict its application. In this paper, on the basis of theoretical analysis, The feasibility of application of coral concrete in concrete filled steel tube is proved. In order to facilitate the practical application of the project, through the combination of experiment, theory and finite element method, this paper focuses on the bearing capacity and ductility of coral filled steel tube concrete columns, and through a lot of numerical analysis, The formula for calculating the bearing capacity of coral-filled steel tubular columns under axial compression is given, and the displacement ductility coefficient of the compression-bending members is calculated. The main contents are as follows: according to the corrosion mechanism of steel in concrete, the corrosion reaction rate is controlled by oxygen content through theoretical analysis. The ultimate corrosion thickness of coral-filled steel tube concrete (CFST) with different types of corrosion is calculated by the method of limit analysis, and the calculated results are compared with the existing experimental results. Taking C30 concrete as reference concrete, using coral reef and sand instead of coarse and fine aggregate in concrete, three groups of 9 concrete filled steel tube concrete stub columns were tested by material property test and axial compression stub column test, respectively. The experimental phenomena and results are analyzed. The axial compression process of concrete filled steel tube (CFST) was simulated by finite element software ABAQUS and verified by the experimental results. According to the unified theory of concrete filled steel tube (CFST), combined with the bearing capacity test and finite element numerical analysis of concrete filled steel tubular columns under axial compression, Finally, a formula for calculating the bearing capacity of coral-filled steel tube columns based on the unified theory design method of concrete-filled steel tubes is given. Based on Rayleigh-Ritz method and limit equilibrium theory, the hysteretic behavior of coral-filled steel tube concrete members is analyzed, and the skeleton curve model of load-displacement curves of steel tube concrete compression-bending members is modified. The displacement ductility coefficient of compression-bending members is calculated, and the reasons for the difference of ductility between coral-filled steel tube concrete and ordinary concrete-filled steel tube are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9;TU312.1
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