發(fā)布時間：2018-08-16 10:49

【摘要】：巨型柱鋼管混凝土結構因鋼管混凝土特有的緊箍效應優(yōu)勢在超高層建筑工程中得到越來越廣泛應用,隨著應用的深入,鋼管與混凝土接觸界面的粘結情況引起工程界的極大關注,并成為工程應用領域研究的難題之一。本文依托于天津117大廈地庫結構工程,對巨型鋼管混凝土結構進行了理論分析及有限元模擬研究,探討了結構內(nèi)部鋼管與混凝土接觸面的粘結滑移情況。 首先,進行了鋼管混凝土粘結強度的理論分析。分別說明了極限粘結強度、平均粘結強度和名義平均滑移的基本概念及相應的計算公式；研究了鋼管混凝土界面粘結力的組成,它與鋼筋與混凝土之間的抗滑移粘結力一樣,主要包括化學膠結力、機械咬合力和摩阻力三部分,并分析了鋼管混凝土推出試驗的P-S關系發(fā)展過程中三者對抗剪的貢獻；總結了鋼管混凝土界面粘結強度的主要影響因素及粘結強度隨這些因素的變化規(guī)律。 其次,對鋼管混凝土結構的材料及界面粘結滑移本構關系進行了研究。通過分析比較國內(nèi)外對鋼管混凝土結構中鋼材和核心混凝土本構關系的研究成果,得到了鋼材及核心混凝土的本構關系,同時從理論上分析了鋼管應力、鋼管與混凝土的粘結應力及相對滑移的相互關系,通過數(shù)學分析,推導了鋼管應力、鋼管與混凝土的粘結應力及相對滑移的解析表達式,及粘結滑移的本構關系。 第三,采用大型通用有限元軟件對天津117大廈地庫結構項目巨型柱鋼筋混凝土結構混凝土澆筑過程進行了有限元數(shù)值模擬,得到了鋼管及核心混凝土的位移、應力及界面的粘結力,并分析了粘結力的分布及粘結滑移情況。 最后,介紹了天津117大廈地庫項目針對巨型柱鋼管混凝土結構所做的木實驗與鋼實驗,并對鋼實驗的溫度場進行了數(shù)值模擬分析。實驗結果及研究結果施工技術的合理可靠性,并為施工優(yōu)化提供了重要依據(jù)。 綜上所述,本文的研究成果為天津117大廈地庫結構項目巨型柱鋼管混凝土結構的實施提供了理論參考與施工建議。
[Abstract]:Concrete filled steel tube (CFST) structure with giant columns has been used more and more widely in super high-rise building engineering because of its unique advantages of the compaction effect of CFST, and with the development of application, The bond between steel tube and concrete has attracted great attention in engineering field and has become one of the problems in engineering application field. Based on the basement structure engineering of Tianjin 117 Building, this paper makes theoretical analysis and finite element simulation study on the giant concrete-filled steel tube structure, and probes into the bond-slip situation of the interface between steel tube and concrete inside the structure. Firstly, the bond strength of concrete-filled steel tube (CFST) is analyzed theoretically. The basic concepts of ultimate bond strength, average bond strength and nominal average slip are explained respectively, and the corresponding calculation formulas are given, and the composition of the interface bond force of concrete filled steel tube is studied, which is the same as the anti-slip bond force between steel bar and concrete. The paper mainly includes three parts: chemical bonding force, mechanical bite force and friction resistance, and analyzes the contribution of them to shear resistance in the development of P-S relation of concrete filled steel tube (CFST) roll-out test. The main factors affecting the bond strength of concrete-filled steel tubular (CFST) interface and the variation of bond strength with these factors are summarized. Secondly, the material and interface bond-slip constitutive relation of concrete-filled steel tubular structure are studied. Through the analysis and comparison of the constitutive relations between steel and core concrete in concrete filled steel tube structures at home and abroad, the constitutive relation of steel and core concrete is obtained, and the stress of steel tube is analyzed theoretically. The relationship between bond stress and relative slip of steel tube and concrete is studied. Through mathematical analysis, the analytical expressions of the stress of steel tube, the bond stress and relative slip of steel tube and concrete, and the constitutive relation of bond slip are derived. Thirdly, the finite element method is used to simulate the concrete pouring process of the giant column reinforced concrete structure project of Tianjin 117 Building, and the displacement of the steel tube and the core concrete is obtained. The stress and bonding force of the interface are analyzed, and the distribution of the bond force and the bond slip are analyzed. At last, the paper introduces the wood experiment and steel experiment for the concrete filled steel tube structure of Tianjin 117 Building, and the numerical simulation of the temperature field of the steel experiment is carried out. The reasonable reliability of the experimental results and the research results provides an important basis for the construction optimization. To sum up, the research results of this paper provide theoretical reference and construction suggestions for the implementation of giant concrete-filled steel tubular structure project of the basement structure of Tianjin 117 Building.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU398.9

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本文編號：2185759