【摘要】：纖維增強(qiáng)復(fù)合材料(FRP, Fiber Reinforced Polymer)具有輕質(zhì)高強(qiáng)、耐腐蝕、耐疲勞等特點(diǎn),能夠改善和解決傳統(tǒng)材料所引起的耐久性難題,被認(rèn)為是實(shí)現(xiàn)高性能、長(zhǎng)壽命的理想材料。但因其彈性模量低而導(dǎo)致結(jié)構(gòu)變形大等原因在一些橋面板結(jié)構(gòu)應(yīng)用中受到限制,將FRP型材與混凝土兩者組合使用可以彌補(bǔ)這一缺陷,既能發(fā)揮FRP耐腐蝕高抗拉強(qiáng)度的優(yōu)勢(shì),又能發(fā)揮混凝土抗壓性能的特點(diǎn)。但既有的FRP型材-混凝土組合橋面板結(jié)構(gòu)存在型材用量多、截面利用率、組合連接件性能不足等問(wèn)題�；谶@一問(wèn)題,為研發(fā)出抗變形能力高和組合性能優(yōu)越的FRP-混凝土組合橋面板體系,本文將從以下幾個(gè)方面開(kāi)展了理論分析和試驗(yàn)研究工作：1、BFRP模殼-混凝土組合橋面板的模殼設(shè)計(jì)。對(duì)模殼的幾何截面形式進(jìn)行較為系統(tǒng)的研究分析,基于截面剛度最大化理論,借助有限元數(shù)值分析,確定了一定跨徑下模殼截面最優(yōu)幾何形態(tài);結(jié)合模殼截面形式、組合方式以及生產(chǎn)工藝對(duì)模殼組合連接件進(jìn)行了深入的優(yōu)化研究；在此基礎(chǔ)上提出采用同源FRP材料提升模殼抗變形能力理念,并對(duì)自平衡預(yù)應(yīng)力FRP模殼設(shè)計(jì)原理、制備方法以及步驟進(jìn)行了系統(tǒng)的研究和闡述。2、BFRP模殼混凝土澆筑施工過(guò)程模擬試驗(yàn)。參考相關(guān)規(guī)范對(duì)上述優(yōu)化設(shè)計(jì)的BFRP模殼和自平衡預(yù)應(yīng)力模殼進(jìn)行混凝土澆筑模擬試驗(yàn),對(duì)模殼在施工狀態(tài)下剛度和應(yīng)力變化進(jìn)行了監(jiān)測(cè)和分析,驗(yàn)證了BFRP模殼在施工階段作為模板使用的可行性,對(duì)比分析了預(yù)應(yīng)力自平衡模殼相對(duì)于無(wú)預(yù)應(yīng)力模殼剛度的提升情況。3、開(kāi)展了7塊不同參數(shù)的組合橋面板靜力性能試驗(yàn),對(duì)其破壞形態(tài)、極限承載力、荷載位移曲線、模殼應(yīng)力應(yīng)變、預(yù)應(yīng)力板條應(yīng)力應(yīng)變等方面進(jìn)行了較為系統(tǒng)的研究,對(duì)比分析了腹板有無(wú)波紋齒作為連接件、腹板波紋齒和粘砂混合連接與否、增強(qiáng)鋼筋和抗剪鋼筋的設(shè)置、模殼的性能(白平衡預(yù)應(yīng)力模殼、無(wú)預(yù)應(yīng)力模殼)對(duì)組合橋面板在正常使用階段和承載能力極限狀態(tài)下受力性能的影響。4、在分析國(guó)內(nèi)外已有FRP-混凝土組合橋面板試驗(yàn)研究成果的基礎(chǔ)上,參考鋼-混組合結(jié)構(gòu)推導(dǎo)建立了BFRP模殼-混凝土組合橋面板抗彎承載力、抗剪承載力及撓度、應(yīng)力理論設(shè)計(jì)公式,建議公式計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好。
[Abstract]:Fiber reinforced composite (FRP, Fiber Reinforced Polymer) has the characteristics of light and high strength, corrosion resistance and fatigue resistance, which can improve and solve the durability problem caused by traditional materials. It is considered to be an ideal material for achieving high performance and long life. However, due to the low elastic modulus, the large deformation of the structure is limited in some bridge deck structures. The combination of FRP profile and concrete can make up for this defect, which can bring into play the advantages of high tensile strength and corrosion resistance of FRP. It can also give play to the characteristics of concrete compressive performance. But there are many problems in the existing FRP profiled concrete composite deck slab structure, such as the large amount of the profile, the utilization ratio of the section, the performance of the composite joint, and so on. Based on this problem, in order to develop FRP- concrete composite deck system with high deformation resistance and superior composite performance, In this paper, theoretical analysis and experimental research are carried out in the following aspects: (1) the design of the shell of BFRP / concrete composite bridge deck slab. Based on the theory of maximum section stiffness and finite element numerical analysis, the optimum geometric shape of die shell section is determined under certain span. The combination mode and production process are used to optimize the die shell composite joint, and on the basis of this, the concept of improving the deformation resistance of die shell with homologous FRP material is put forward, and the design principle of self-balanced prestressed FRP die shell is discussed. The preparation method and steps are systematically studied and expounded. 2. Simulation test of concrete pouring process of BFRP mold shell. With reference to the relevant codes, the concrete pouring simulation tests of the BFRP shell and the self-balanced prestressed shell are carried out, and the stiffness and stress changes of the shell under construction condition are monitored and analyzed. The feasibility of using the BFRP shell as a formwork in the construction phase is verified. The stiffness of the prestressed self-balanced shell is compared with that of the unprestressed shell. 3. Seven static performance tests of composite deck slab with different parameters are carried out. The failure mode, ultimate bearing capacity, load-displacement curve, stress and strain of die shell, stress and strain of prestressed slab are studied systematically, and the corrugated teeth of web plate are compared and analyzed. Web corrugated teeth and sand mixed connection, reinforced steel bar and shear reinforcement, mold shell performance (White balance prestressed mold shell, The influence of unprestressed shell on the mechanical behavior of composite deck slabs under normal service stage and ultimate loading capacity. 4. Based on the analysis of the experimental results of FRP- concrete composite deck slabs at home and abroad, According to the derivation of steel-concrete composite structure, the formulas for the design of flexural bearing capacity, shear bearing capacity, deflection and stress of BFRP modular shell concrete composite deck slab are established. The calculated results of the proposed formula are in good agreement with the experimental results.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.31

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