【摘要】：鋼結(jié)構(gòu)在長(zhǎng)期使用階段因銹蝕、疲勞或超載等原因會(huì)引起損傷累積而影響結(jié)構(gòu)的安全。如何加固修復(fù)損傷鋼結(jié)構(gòu)、提升既有結(jié)構(gòu)性能一直是土木工程領(lǐng)域研究的一項(xiàng)重要課題。碳纖維復(fù)合材料(CFRP)加固鋼結(jié)構(gòu)技術(shù)作為一種具有獨(dú)特優(yōu)勢(shì)的加固方法,近年來(lái)成為國(guó)內(nèi)外學(xué)者研究的熱點(diǎn)。目前,雖然國(guó)內(nèi)外學(xué)者對(duì)CFRP加固軸心受壓鋼柱承載力有一定的研究,但對(duì)考慮偏心受壓的壓彎構(gòu)件穩(wěn)定性研究較少。針對(duì)己有研究存在的不足,對(duì)加固偏心受壓鋼柱的平面內(nèi)穩(wěn)定性研究是非常有必要的。本文所做的研究工作及其成果如下:(1)開(kāi)展了CFRP加固偏壓方鋼管、圓鋼管試驗(yàn),研究考慮偏心距、CFRP層數(shù)和鋼管截面形式對(duì)加固鋼管柱整體穩(wěn)定性能的影響。試驗(yàn)結(jié)果表明中長(zhǎng)長(zhǎng)細(xì)比鋼管構(gòu)件破壞模式為構(gòu)件柱中央截面受壓側(cè)首先出現(xiàn)屈服導(dǎo)致的彎矩作用平面內(nèi)整體失穩(wěn)破壞;隨著粘貼CFRP層數(shù)的增加,加固試件的穩(wěn)定承載力會(huì)有很一定程度的提高。粘貼相同層數(shù)CFRP的鋼管柱隨著偏心距的增加,極限承載力減小;相同構(gòu)造條件下,粘貼CFRP加固圓鋼管效果比方鋼管相對(duì)好一些。(2)采用ANSYS軟件建立了“殼-彈簧-殼”的有限元計(jì)算模型,將試驗(yàn)結(jié)果和計(jì)算模擬結(jié)果進(jìn)行對(duì)比,驗(yàn)證了所建有限元模型的有效性。(3)對(duì)CFRP加固偏心受壓方鋼管柱和圓鋼管柱的穩(wěn)定性進(jìn)行數(shù)值模擬分析,對(duì)比分析了CFRP層數(shù)、構(gòu)件長(zhǎng)細(xì)比、加載偏心距等參數(shù)對(duì)CFRP加固偏心受壓鋼管柱穩(wěn)定性的影響程度。(4)對(duì)考慮在不同初始應(yīng)力下CFRP加固偏心受壓鋼管柱進(jìn)行了參數(shù)分析,研究初始應(yīng)力對(duì)加固偏壓鋼管柱穩(wěn)定性能的影響。本課題為新編國(guó)家標(biāo)準(zhǔn)《鋼結(jié)構(gòu)加固設(shè)計(jì)規(guī)范》資助課題,本文的研究成果可為標(biāo)準(zhǔn)編制和工程應(yīng)用提供理論與試驗(yàn)依據(jù)。
[Abstract]:Corrosion, fatigue or overloading will cause damage accumulation in steel structures during long-term service, which will affect the safety of steel structures. How to strengthen and repair damaged steel structures and improve the performance of existing structures has always been an important topic in the field of civil engineering. As a unique method of strengthening steel structure reinforced with carbon fiber reinforced polymer (CFRP), in recent years, it has become a hot research topic both at home and abroad. At present, although scholars at home and abroad have a certain amount of research on bearing capacity of axial compression steel columns strengthened by CFRP, there is little research on the stability of compression and bending members considering eccentric compression. It is necessary to study the in-plane stability of eccentrically compressed steel columns. The research work and achievements of this paper are as follows: (1) CFRP strengthened square steel pipe and circular steel pipe test are carried out. The effects of eccentricity, CFRP layer number and steel pipe section form on the overall stability of reinforced steel pipe columns are studied. The experimental results show that the failure mode of steel tube members with medium to long slenderness ratio is that the buckling failure occurs first on the compression side of the central section of the member column, which is caused by the bending moment in the plane. With the increase of the number of CFRP layers, the stability bearing capacity of the reinforced specimens will be improved to a certain extent. With the increase of eccentricity, the ultimate bearing capacity of steel string pasted with the same number of CFRP decreases with the increase of eccentricity. Under the same construction conditions, the effect of strengthening circular steel pipe with CFRP is better than that of steel pipe. (2) the finite element model of "shell-spring-shell" is established by using ANSYS software, and the experimental results are compared with the results of calculation simulation. The validity of the finite element model is verified. (3) the stability of eccentrically compressed square steel tube column and circular steel tube column strengthened by CFRP is numerically simulated and analyzed, and the number of CFRP layers and the slenderness ratio of members are compared and analyzed. The influence of loading eccentricity and other parameters on the stability of eccentrically compressed steel tube columns strengthened by CFRP is studied. (4) the parameters of eccentrically compressed steel tube columns strengthened by CFRP under different initial stresses are analyzed. The effect of initial stress on the stability of steel tube columns strengthened by bias is studied. The research results of this paper can provide the theoretical and experimental basis for the compilation and engineering application of the new national standard code for steel structure reinforcement design. The research results of this paper can provide theoretical and experimental basis for the compilation of the standard and the engineering application.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU392.3

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