【摘要】：近年來,鋼結(jié)構(gòu)以其優(yōu)越的力學(xué)性能越來越多的被使用在實際工程中,但隨著鋼結(jié)構(gòu)服役時間的增加,某些鋼構(gòu)件的承載力會出現(xiàn)不同程度的下降,因此對鋼結(jié)構(gòu)構(gòu)件的加固補強是非常重要的。本文采用試驗研究、理論分析以及有限元模擬相結(jié)合的方法,系統(tǒng)研究了外包鋼筋混凝土加固軸心受壓鋼柱的力學(xué)性能。最后,基于已有試驗數(shù)據(jù)和理論,通過理論分析和有限元模擬探討了外包碳纖維混凝土加固軸心受壓鋼柱的力學(xué)性能和承載力計算公式。主要內(nèi)容有:通過對未負載下加固鋼柱以及負載下加固鋼柱的軸心受壓試驗,研究外包鋼筋混凝土加固軸心受壓鋼柱的力學(xué)性能,型鋼、混凝土和鋼筋的應(yīng)力發(fā)展情況,以及初始負載大小、混凝土強度和型鋼強度對加固構(gòu)件受力性能的影響。試驗結(jié)果表明:外包鋼筋混凝土的加固方法可以顯著提高原鋼構(gòu)件的承載能力和剛度;加固后構(gòu)件的承載力與混凝土強度和型鋼強度成正比,與型鋼的初始負載大小成反比,并通過截面強度換算法推導(dǎo)出了外包鋼筋混凝土加固軸心受壓鋼柱正截面承載力計算公式�；谠囼灁�(shù)據(jù),建立ABAQUS有限元計算模型研究型鋼初始負載、外包混凝土強度、核心型鋼強度、截面尺寸等不同參數(shù)對于外包混凝土加固軸心受壓鋼柱正截面承載力的影響。基于已有的試驗數(shù)據(jù)和相關(guān)結(jié)論建立ABAQUS有限元計算模型來探討外包碳纖維混凝土加固軸心受壓鋼柱的力學(xué)性能、加固后構(gòu)件的承載力,并對型鋼初始負載、核心型鋼強度、截面尺寸等不同參數(shù)對于外包混凝土加固軸心受壓鋼柱正截面承載力的影響進行分析對比,得出加固后構(gòu)件的承載力與型鋼強度和截面尺寸的大小成正比,與型鋼的初始負載大小成反比。在碳纖維體積率合適的情況下采用碳纖維混凝土加固軸心受壓鋼柱比采用普通混凝土加固軸心受壓鋼柱的承載力有一定程度的提高,但提高幅度不是很大。
[Abstract]:In recent years, more and more steel structures have been used in practical projects for their superior mechanical properties. However, with the increase of service time of steel structures, the bearing capacity of some steel members will decrease in varying degrees. Therefore, it is very important to strengthen the steel structure. In this paper, the mechanical properties of axially compressed steel columns strengthened with reinforced concrete are systematically studied by means of experimental study, theoretical analysis and finite element simulation. Finally, based on the existing experimental data and theory, the formulas of mechanical properties and bearing capacity of steel columns strengthened with CFRP are discussed by theoretical analysis and finite element simulation. The main contents are as follows: the mechanical properties, stress development of section steel, concrete and steel bar are studied through axial compression tests of steel columns strengthened with unloaded steel columns and steel columns strengthened with steel columns under load. The effects of initial load, concrete strength and steel strength on the mechanical behavior of reinforced members are also discussed. The experimental results show that the reinforced concrete reinforcement method can significantly improve the bearing capacity and stiffness of the original steel members, and the bearing capacity of the strengthened members is in direct proportion to the strength of concrete and the strength of the section steel, and inversely proportional to the initial load of the section steel. The formula for calculating the normal section bearing capacity of steel columns strengthened with reinforced concrete is derived by the method of section strength conversion. Based on the experimental data, a ABAQUS finite element model was established to study the effect of different parameters such as initial load, strength of concrete, strength of core steel and size of section on the bearing capacity of steel columns under axial compression. Based on the existing experimental data and related conclusions, a ABAQUS finite element model is established to study the mechanical properties of steel columns strengthened with CFRP, the bearing capacity of strengthened members, and the initial load and strength of core steel. The effect of different parameters such as section size on the bearing capacity of axial compression steel columns strengthened with concrete is analyzed and compared. The results show that the bearing capacity of strengthened members is proportional to the strength and size of section steel. It is inversely proportional to the initial load of the section steel. When the volume ratio of carbon fiber is suitable, the bearing capacity of steel columns strengthened with carbon fiber reinforced concrete is improved to some extent than that of steel columns strengthened by ordinary concrete, but the extent of improvement is not very large.
【學(xué)位授予單位】：沈陽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391

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