本文選題：無(wú)粘結(jié)預(yù)應(yīng)力RPC梁 + 開(kāi)裂荷載�。� 參考：《湖南科技大學(xué)》2017年碩士論文

【摘要】：活性粉末混凝土(Reactive Powder Concrete,以下簡(jiǎn)稱(chēng)RPC)以其具有的優(yōu)異性能逐漸受到研究人員的青睞。國(guó)內(nèi)外學(xué)者對(duì)其材料的配合比構(gòu)件的靜力性能耐腐蝕性能等進(jìn)行了研究,但對(duì)其構(gòu)件疲勞性能的研究還是很少涉及。而實(shí)際生活中構(gòu)件在大多數(shù)情況下都可能承受疲勞荷載。同時(shí)由于活性粉末混凝土構(gòu)件的截面應(yīng)力分布及破壞形式不同于普通混凝土。出于以上因素的考慮,為了能充分利用RPC的高強(qiáng)性能,并使其能在工程中得到廣泛運(yùn)用。本文對(duì)施加了無(wú)粘結(jié)預(yù)應(yīng)力的RPC梁開(kāi)展了靜力及疲勞性能方面的試驗(yàn)研究及理論分析。并對(duì)比以往研究的普通鋼筋RPC梁試驗(yàn)結(jié)果,突出無(wú)粘結(jié)預(yù)應(yīng)力RPC梁的受拉性能。具體完成的內(nèi)容如下:(1)綜合的闡述了目前對(duì)于RPC的研究現(xiàn)狀,總結(jié)歸納了已經(jīng)得出的一些結(jié)論。并針對(duì)研究中相對(duì)較少涉及使用過(guò)程中又不可避免的問(wèn)題提出本文研究?jī)?nèi)容。(2)通過(guò)材料力學(xué)性能試驗(yàn),得到了RPC抗拉強(qiáng)度抗壓強(qiáng)度及彈性模量,為理論分析提供基礎(chǔ)數(shù)據(jù)。并詳細(xì)描述了無(wú)粘結(jié)預(yù)應(yīng)力RPC梁及普通鋼筋RPC梁的靜載及疲勞試驗(yàn)過(guò)程。對(duì)比了兩種試驗(yàn)梁的靜力性能,分析了普通鋼筋RPC梁及無(wú)粘結(jié)預(yù)應(yīng)力RPC梁在疲勞荷載作用下裂縫寬度撓度受壓區(qū)邊緣應(yīng)變隨加載次數(shù)的變化規(guī)律。(3)由于無(wú)粘結(jié)預(yù)應(yīng)力RPC梁受力性能較為復(fù)雜,所以重點(diǎn)對(duì)無(wú)粘結(jié)預(yù)應(yīng)力RPC受力特點(diǎn)進(jìn)行分析。根據(jù)RPC材料抗拉強(qiáng)度高的特點(diǎn),推導(dǎo)出了無(wú)粘結(jié)預(yù)應(yīng)力RPC梁考慮受拉區(qū)抗拉作用的開(kāi)裂彎矩正截面承載能力及跨中截面撓度的計(jì)算公式,并利用無(wú)粘結(jié)預(yù)應(yīng)力筋應(yīng)力增量與撓度的關(guān)系來(lái)建立預(yù)應(yīng)力增量的計(jì)算公式。利用推導(dǎo)的公式計(jì)算出的值與試驗(yàn)實(shí)測(cè)值進(jìn)行對(duì)比,結(jié)果較為接近。(4)結(jié)合無(wú)粘結(jié)預(yù)應(yīng)力RPC梁的疲勞試驗(yàn)結(jié)果,通過(guò)非線性擬合得到了損傷變量的表達(dá)式。同時(shí)得到了隨疲勞荷載循環(huán)次數(shù)的增加總應(yīng)變及殘余應(yīng)變發(fā)展模型,利用殘余應(yīng)變模型推導(dǎo)出了RPC彈性模量退化模型。從損傷變量的定義出發(fā)推導(dǎo)了通過(guò)彈性模量的退化所表示的鋼筋疲勞損傷模型。(5)以普通混凝土疲勞分析過(guò)程中所采用的基本假定為基礎(chǔ),結(jié)合無(wú)粘結(jié)預(yù)應(yīng)力RPC梁具體的受力特點(diǎn)提出了疲勞分析所使用的基本假定。將疲勞非線性分析過(guò)程利用分段線性進(jìn)行代替,推導(dǎo)出了無(wú)粘結(jié)預(yù)應(yīng)力RPC梁疲勞全過(guò)程分析的簡(jiǎn)化方法,并與試驗(yàn)結(jié)果對(duì)比較為接近。
[Abstract]:Reactive Powder concrete (RPCs) has been favored by researchers for its excellent properties. What is the proportion of domestic and foreign scholars to their materials? Static performance of components? Corrosion resistance has been studied, but the fatigue properties of the components are seldom studied. In real life, members may bear fatigue load in most cases. At the same time, the stress distribution and failure form of reactive powder concrete members are different from those of ordinary concrete. Considering the above factors, in order to make full use of the high strength performance of RPC and make it widely used in engineering. In this paper, the static and fatigue behavior of RPC beams with unbonded prestressing is studied and analyzed theoretically. Compared with the test results of ordinary reinforced RPC beams, the tensile properties of unbonded prestressed RPC beams are highlighted. The detailed contents are as follows: 1) the current research status of RPC is expounded synthetically, and some conclusions are summarized and summarized. And in view of the relatively few problems that are unavoidable in the process of use in the research, this paper puts forward the research content. 2) through the test of mechanical properties of materials, the tensile strength of RPC is obtained. Compressive strength and elastic modulus provide basic data for theoretical analysis. The static load and fatigue tests of unbonded prestressed RPC beams and ordinary reinforced RPC beams are described in detail. In this paper, the static behavior of two kinds of test beams is compared, and the crack width of ordinary reinforced RPC beams and unbonded prestressed RPC beams under fatigue load is analyzed. Deflection? The stress characteristics of unbonded prestressed RPC beams are mainly analyzed because of the complexity of the mechanical behavior of unbonded prestressed RPC beams. According to the characteristics of high tensile strength of RPC material, the cracking moment of unbonded prestressed RPC beam considering tensile effect in tensile zone is deduced. The formulas for calculating the bearing capacity of the normal section and the deflection of the mid-span section are presented. The formula for calculating the prestress increment is established by using the relationship between the stress increment and the deflection of the unbonded prestressed tendons. By comparing the calculated values with the measured values, the results are close to the fatigue test results of unbonded prestressed RPC beams, and the expression of damage variables is obtained by nonlinear fitting. At the same time, the development model of total strain and residual strain with the increase of fatigue load cycle number is obtained, and the elastic modulus degradation model of RPC is derived by using the residual strain model. Based on the definition of damage variable, the fatigue damage model of steel bar expressed by the degradation of elastic modulus is based on the basic assumptions used in the fatigue analysis of ordinary concrete. Combined with the concrete stress characteristics of unbonded prestressed RPC beams, the basic assumptions used in fatigue analysis are put forward. By replacing the nonlinear fatigue analysis process with piecewise linear method, a simplified method for fatigue analysis of unbonded prestressed RPC beams is derived, which is close to the experimental results.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU37

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