【摘要】：隨著海洋開發(fā)以及海洋權(quán)益的爭奪，包括軍事防護工程在內(nèi)的海洋工程建設(shè)日益增多，對于遠離大陸的島礁工程來說，所需的各項材料均從遙遠的大陸運輸，其運輸成本非常昂貴。鋼管珊瑚混凝土構(gòu)件因珊瑚混凝土原材料易獲得，，早期強度高，施工方便等優(yōu)點成為海洋開發(fā)項目的首選。但由于珊瑚的生活環(huán)境和結(jié)構(gòu)特性決定其表面有大量氯離子附著，氯離子腐蝕成為制約其應(yīng)用的首要問題，本文在理論分析的基礎(chǔ)上，證明了珊瑚混凝土在鋼管混凝土中應(yīng)用的可行性。為方便工程實際應(yīng)用，本文通過實驗、理論和有限元相結(jié)合的方法，重點研究鋼管珊瑚混凝土柱的承載力性能及延性性能，通過大量的數(shù)值分析，給出了鋼管珊瑚混凝土柱軸壓承載力計算公式，并計算了壓彎構(gòu)件的位移延性系數(shù)。 具體包括以下研究工作： 依據(jù)混凝土中鋼材的腐蝕機理，通過理論分析得出腐蝕反應(yīng)速率由氧氣含量控制，通過極限分析方法計算不同截面形式的鋼管珊瑚混凝土在不同腐蝕類型下的極限腐蝕厚度，并將計算結(jié)果與已有的實驗結(jié)果進行對比。 以C30混凝土為基準混凝土，用珊瑚礁、砂全部替代混凝土中的粗、細骨料，分別對3組9個鋼管珊瑚混凝土短柱進行了材性實驗和軸壓短柱實驗，并對實驗現(xiàn)象和結(jié)果進行分析。 用有限元軟件ABAQUS對鋼管珊瑚混凝土軸壓過程進行模擬，并用實驗結(jié)果進行驗證；依據(jù)普通鋼管混凝土統(tǒng)一理論，結(jié)合鋼管珊瑚混凝土軸壓短柱承載力試驗和有限元數(shù)值分析，最終給出基于普通鋼管混凝土統(tǒng)一理論設(shè)計法的鋼管珊瑚混凝土柱承載力計算公式。 根據(jù)瑞利-里茲法和極限平衡理論進行了鋼管珊瑚混凝土構(gòu)件滯回性能的分析，修正了鋼管素混凝土壓彎構(gòu)件荷載-位移曲線的骨架曲線模型，計算了壓彎構(gòu)件的位移延性系數(shù)，對比分析了鋼管珊瑚混凝土與鋼管普通混凝土延性差異的原因。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU398.9;TU312.1

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