本文選題：纖維編制網(wǎng)增強(qiáng)混凝土(TRC) + 修復(fù)加固　； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：纖維編織網(wǎng)增強(qiáng)混凝土(Textile Reinforced Concrete,TRC)具有良好的承載、限裂和耐腐蝕的能力,適合應(yīng)用于嚴(yán)酷環(huán)境下混凝土結(jié)構(gòu)的修復(fù)加固。TRC的這些優(yōu)點(diǎn)使其在建筑結(jié)構(gòu)中具有廣泛的應(yīng)用前景。目前,關(guān)于常規(guī)環(huán)境下TRC加固混凝土結(jié)構(gòu)力學(xué)性能研究較多,但關(guān)于其在腐蝕環(huán)境下的力學(xué)性能和耐久性能的研究還較少,尤其在承載加固條件下的研究也未見公開報(bào)道,這在一定程度上限制了TRC的應(yīng)用。本文主要研究了氯鹽干濕循環(huán)作用下TRC加固未承載鋼筋混凝土(Reinforced Concrete,RC)梁和承載RC梁的受彎性能。未承載加固梁考慮了氯鹽干濕循環(huán)及其與彎曲應(yīng)力耦合作用等因素對(duì)加固梁受彎性能的影響。承載加固梁考慮了加固時(shí)承載應(yīng)力大小、加固方式、纖維編織網(wǎng)種類、短切纖維摻量、鹽水濃度、干濕循環(huán)及其與彎曲應(yīng)力耦合作用等因素對(duì)加固梁受彎性能的影響。最后,基于試驗(yàn)結(jié)果,給出了氯鹽條件下TRC加固RC受彎梁分析理論的計(jì)算公式。對(duì)未承載加固梁的研究結(jié)果表明,隨著干濕循環(huán)次數(shù)的增加,梁的最大裂縫寬度和跨中撓度增加,而開裂荷載、屈服荷載和極限荷載有降低趨勢(shì);隨著腐蝕時(shí)彎曲應(yīng)力的增大,梁的最大裂縫寬度會(huì)增加,屈服荷載和極限荷載會(huì)有所降低。在0.5彎曲應(yīng)力的條件下,梁的裂縫寬度、極限荷載都有較大的下降。受持載腐蝕時(shí)初始撓度的影響,在同級(jí)加荷試驗(yàn)下梁的跨中撓度有所降低。對(duì)承載加固梁的研究結(jié)果表明,在0.2和0.4承載應(yīng)力加固梁時(shí),TRC加固能起到很好的作用,使梁的裂縫寬度和撓度得到改善,增加了梁的承載力,但是在0.6承載應(yīng)力時(shí),TRC加固梁破壞模式的改變?cè)斐闪旱恼w性能有較大程度降低。使用預(yù)制TRC加固梁,在破壞形態(tài)上稍有不同,但在承載力提高和撓度控制上和現(xiàn)澆TRC相差不大,所以預(yù)制TRC加固梁也是可以應(yīng)用到實(shí)際工程中的。使用碳纖維編織網(wǎng)制成的TRC在加固RC梁時(shí)承載力方面優(yōu)于玄武巖纖維編織網(wǎng)制成的TRC,細(xì)�；炷林袚郊佣糖欣w維使得加固效果有所加強(qiáng)。隨著鹽水濃度和干濕循環(huán)次數(shù)的增加,梁的裂縫寬度和撓度有增大趨勢(shì),梁的承載力有所降低;隨著腐蝕時(shí)彎曲應(yīng)力的增大,梁的極限承載力有所下降,裂縫寬度有增大的趨勢(shì),但是鋼筋屈服前梁的裂縫寬度和撓度控制較好�；跇O限分析理論和試驗(yàn)結(jié)果,給出了氯鹽干濕循環(huán)下TRC加固混凝土梁的極限承載力公式,采用公式得到的計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。
[Abstract]:Textile Reinforced Concrete (TRC) has good bearing, crack resistance and corrosion resistance. It is suitable for the application of concrete structures under harsh environment to repair and reinforce.TRC. These advantages make it widely applied in the construction structure. At present, the structure force of TRC reinforced concrete under the conventional environment There are many studies on the performance of the study, but there are few studies on the mechanical and durability of the corrosion environment, especially in the study of the loading and strengthening conditions. This has limited the application of TRC to a certain extent. This paper mainly studies the reinforcement of the unloaded reinforced concrete (Reinforced C) by the dry and wet cycle of chlorine salt. The flexural performance of oncrete, RC) beams and bearing RC beams. The effects of the dry and wet cycle of chlorine salt and the coupling effect of the bending stress on the flexural properties of the reinforced beams are considered. The bearing and reinforcement beams consider the size of the bearing stress, the strengthening method, the type of fiber weave, the amount of short cut fiber, the concentration of brine, the dry and wet cycle. The influence of the coupling effect of the bending stress on the flexural performance of the reinforced beam. Finally, based on the test results, the calculation formula for the analysis theory of the bending beam strengthened with TRC under the chlorine salt condition is given. The results of the study on the unloaded reinforced beams show that the maximum crack width and the mid span deflection of the beam increase with the increase of the number of dry and wet cycles. The cracking load, the yield load and the ultimate load tend to decrease, with the increase of the bending stress, the maximum crack width of the beam will increase, the yield load and the ultimate load will be reduced. Under the condition of 0.5 bending stress, the crack width and ultimate load of the beam are greatly reduced. Under the same grade loading test, the span deflection of the beam is reduced. The results of the study on the reinforced beam show that the TRC reinforcement can play a very good role in the 0.2 and 0.4 stress reinforcement beams. The crack width and deflection of the beam are improved and the bearing capacity of the beam is increased, but the failure mode of the beam strengthened by the TRC reinforcement is caused by the 0.6 loading stress. The overall performance of the beam is greatly reduced. The use of prefabricated TRC beams is slightly different in the form of failure, but there is little difference between the bearing capacity and the deflection control and the cast in place TRC. So the precast TRC reinforced beam can also be applied to the actual project. The bearing capacity of the TRC used in the reinforcement of the RC beam is better than that of the RC beam. With the addition of short cut fiber in the TRC of basalt fiber weave, the reinforcement effect is strengthened. With the increase of brine concentration and the number of dry and wet cycles, the crack width and deflection of the beam are increased, the bearing capacity of the beam is reduced, and the ultimate bearing capacity of the beam decreases with the increase of the bending stress. The width of the seam is increasing, but the crack width and deflection of the beam are well controlled. Based on the limit analysis theory and test results, the formula of the ultimate bearing capacity of the concrete beams strengthened with TRC under the dry and wet cycle of chlorine salt is given. The calculation results obtained by the formula are in good agreement with the test results.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU37

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本文編號(hào)：1929572