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  本文選題：鋼橋面鋪裝　切入點：超高韌性混凝土　出處：《湖南大學(xué)》2014年碩士論文

【摘要】：鋼橋面鋪裝層作為大跨徑橋梁的重要組成部分,越來越受到學(xué)者和工程師的關(guān)注。然而,目前的鋼橋面鋪裝層卻存在許多弊端,很容易出現(xiàn)早期病害,如車轍、鋪裝層開裂、脫層等。為解決鋼橋面鋪裝層易損壞的問題,本文提出將薄層聚合物混凝土TPO鋪筑于超高韌性混凝土STC和鋼橋面板之上,形成超高性能的輕型組合橋面鋪裝體系,簡稱STC+TPO。本文主要開展STC+TPO鋪裝體系基本力學(xué)性能研究,取得了如下研究成果： 概括了鋼橋面鋪裝體系的受力特點和常見病害,總結(jié)出鋼橋面鋪裝易損壞的兩個根本原因：橋面系剛度不足和鋪裝材料在物理力學(xué)性能方面存在缺陷。針對目前鋼橋面鋪裝的不足,提出STC+TPO鋪裝,并將其設(shè)計控制指標確定為鋪裝層拉應(yīng)力指標和層間剪應(yīng)力指標 通過對STC、TPO材料性能及界面強度的研究,得到了兩種材料的力學(xué)參數(shù)和界面的粘結(jié)性能參數(shù)。研究表明STC、TPO材料具有優(yōu)良的性能,足以勝任鋼橋面鋪裝；STC-鋼板、STC-TPO的界面粘結(jié)性能優(yōu)異,能夠保證層間的可靠粘結(jié)。以上材料基本參數(shù)的獲取,也為后面的力學(xué)分析和強度可靠性分析提供了依據(jù)。 本文基于驗證過的北江馬房大橋有限元模型,分析了STC+TPO鋪裝體系的受力和變形特點。計算結(jié)果表明,采用STC+TPO鋪裝體系,能有效降低鋼橋面板和鋪裝層的應(yīng)力應(yīng)變幅值和局部豎向變形。此外,車輛荷載、環(huán)境溫度和鋪裝層厚度等對STC+TPO鋪裝體系的受力狀況有較大影響。通過綜合考慮多參數(shù)的影響,得到STC+TPO的最不利受力狀態(tài),并計算了此狀態(tài)下鋪裝層中的應(yīng)力值。 本文對STC+TPO鋪裝體系的動力特性進行了初步分析,并將動力解與靜力解進行了對比。計算結(jié)果表明：鋪裝層最大豎向位移的動力解與靜力解基本相同；鋪裝層最大拉應(yīng)力的動力解與靜力解則相差較大,其沖擊系數(shù)受車輛參數(shù)和鋪裝層結(jié)構(gòu)參數(shù)的共同影響,但沖擊系數(shù)的值均小于0.2,這也說明靜力分析中取0.3的沖擊系數(shù)是安全可靠的。 結(jié)合動力、靜力分析的結(jié)果和材料性能參數(shù),本文對STC+TPO鋪裝體系的強度可靠性進行了分析。結(jié)果表明：STC和TPO的抗拉強度及界面抗剪強度均滿足重載和高溫環(huán)境下的使用要求。從以上結(jié)果可知：STC+TPO是一種性能優(yōu)異的鋪裝,能夠解決鋼橋面鋪裝層易損壞的難題。
[Abstract]:As an important part of long-span bridge, steel deck pavement is paid more and more attention by scholars and engineers.However, the present steel bridge deck pavement has many disadvantages, such as rutting, pavement cracking, delamination and so on.In order to solve the problem that steel bridge deck pavement is easy to be damaged, this paper puts forward that the thin-layer polymer concrete (TPO) is constructed on the top of ultra-high toughness concrete (STC) and steel bridge face slab to form ultra-high performance lightweight composite deck pavement system (STC TPO).In this paper, the basic mechanical properties of STC TPO pavement system are studied, and the results are as follows:This paper summarizes the mechanical characteristics and common diseases of steel bridge deck pavement system, and summarizes two fundamental reasons for the easy damage of steel bridge deck pavement: insufficient stiffness of deck system and defects in physical and mechanical properties of pavement materials.In view of the deficiency of steel bridge deck pavement at present, STC TPO pavement is put forward, and its design control index is determined as tensile stress index and interlayer shear stress index.By studying the properties and interfacial strength of STC TPO materials, the mechanical parameters and bond properties of the two materials were obtained.The results show that the STC- TPO material has excellent properties, which is sufficient for the interfacial bonding of STC-TPO in steel bridge deck pavement, and can guarantee the reliable bond between the layers.The acquisition of the basic parameters of the above materials also provides the basis for the mechanical analysis and strength reliability analysis.Based on the verified finite element model of Bei Jiang Mafang Bridge, this paper analyzes the stress and deformation characteristics of STC TPO pavement system.The calculation results show that the stress and strain amplitude and local vertical deformation of steel bridge slab and pavement can be effectively reduced by using STC TPO paving system.In addition, vehicle load, ambient temperature and pavement thickness have great influence on the stress of STC TPO pavement system.By considering the influence of multiple parameters, the most unfavorable stress state of STC TPO is obtained, and the stress values in the pavement under this condition are calculated.In this paper, the dynamic characteristics of STC TPO pavement system are preliminarily analyzed, and the dynamic and static solutions are compared.The results show that the dynamic solution of the maximum vertical displacement of the pavement is basically the same as the static solution, and the dynamic and static solutions of the maximum tensile stress of the pavement are quite different, and its impact coefficient is affected by the vehicle parameters and the structural parameters of the pavement.However, the impact coefficient is less than 0.2, which also shows that the impact coefficient of 0.3 is safe and reliable in static analysis.Combined with the results of dynamic, static analysis and material performance parameters, the strength reliability of STC TPO pavement system is analyzed in this paper.The results show that the tensile strength and the interfacial shear strength of TPO and w STC meet the requirements of heavy load and high temperature environment.From the above results, it can be seen that TPO is a kind of pavement with excellent performance, which can solve the problem that steel bridge deck pavement is easy to be damaged.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.33

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本文編號：1713902