本文選題：受損構(gòu)件 + 碳纖維板　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：橋梁作為地區(qū)經(jīng)濟(jì)發(fā)展的紐帶，在公路交通中起著舉足輕重的作用。然而，由于長期累積損傷，或者因偶然荷載，如地震、超載等原因造成部分橋梁受損嚴(yán)重，那么緊急、快速、有效的橋梁加固技術(shù)就顯得非常重要。預(yù)應(yīng)力碳纖維板快速加固技術(shù)是一種主動加固技術(shù)，它集成了粘貼碳纖維加固技術(shù)和預(yù)應(yīng)力加固技術(shù)的優(yōu)點(diǎn)，能夠?qū)崿F(xiàn)對橋梁結(jié)構(gòu)的快速、有效的加固處治，是目前國內(nèi)外研究的熱點(diǎn)和前沿，，也是應(yīng)用前景非常廣闊的一種加固技術(shù)。在以往進(jìn)行的預(yù)應(yīng)力碳纖維板加固試驗(yàn)研究中，大部分都是針對結(jié)構(gòu)狀態(tài)相對比較好的構(gòu)件進(jìn)行加固，對受損嚴(yán)重的構(gòu)件的加固試驗(yàn)還未見公開的文獻(xiàn)報(bào)道，所以本文試驗(yàn)研究了1片嚴(yán)重受損（裂縫寬度達(dá)到1.5mm）的混凝土T梁構(gòu)件，經(jīng)預(yù)應(yīng)力碳纖維板加固后，其承載能力、變形性能的發(fā)生顯著改善，經(jīng)試驗(yàn)研究，得到如下重要成果： ①雖然嚴(yán)重受損構(gòu)件的初始裂縫寬度較大，但經(jīng)預(yù)應(yīng)力碳纖維板加固后，裂縫寬度顯著減小，且對碳纖維板預(yù)應(yīng)力的放張損失及長期損失進(jìn)行觀測表明預(yù)應(yīng)力長期損失非常小，不足三次張拉應(yīng)力的1%。 ②在整個(gè)試驗(yàn)加載過程中，且直到上緣混凝土最終壓潰，碳纖維板都沒有發(fā)生錨固失效，且碳纖維板與構(gòu)件也未發(fā)生剝離，碳纖維板保持完好，碳纖維板與T梁構(gòu)件共同工作性能較好，加固效果接近正常一般微損傷構(gòu)件的加固，說明預(yù)應(yīng)力碳纖維板快速加固能較好恢復(fù)和提高原結(jié)構(gòu)的承載力和受力性能。 ③理論分析表明，采用平截面假定及內(nèi)力平衡為基礎(chǔ)的計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好，說明以傳統(tǒng)的平截面假定為基礎(chǔ)的力學(xué)模型可以較好的預(yù)測經(jīng)過預(yù)應(yīng)力碳纖維板加固的受彎構(gòu)件的工作性能。 以上對受損嚴(yán)重構(gòu)件的快速加固研究，對橋梁搶險(xiǎn)、抗震救災(zāi)等緊急情況下橋梁的快速承載能力恢復(fù)具有很強(qiáng)的工程應(yīng)用價(jià)值。
[Abstract]:As the link of regional economic development, bridge plays an important role in highway traffic. However, due to long-term cumulative damage, or due to accidental loads, such as earthquake, overload and other reasons causing serious damage to some bridges, then urgent, rapid, effective bridge reinforcement technology is very important. The fast strengthening technology of prestressed carbon fiber slab is a kind of active reinforcement technology. It integrates the advantages of bonded carbon fiber reinforcement technology and prestressed reinforcement technology, and can realize the fast and effective reinforcement of bridge structure. It is the hot spot and frontier of domestic and international research at present, and it is also a kind of reinforcement technology with very broad application prospect. In the previous experimental study of prestressed carbon fiber slab reinforcement, most of them are aimed at the relatively good structural members. The experimental results of the severely damaged members have not been reported in the public literature. Therefore, this paper tests and studies a seriously damaged concrete T-beam member (crack width up to 1.5mm). After strengthening with prestressed carbon fiber slab, the bearing capacity and deformation performance of the member are improved significantly. The experimental results are as follows: (1) although the initial crack width of severely damaged members is large, the crack width decreases significantly after strengthening with prestressed carbon fiber slab, and the long term loss of prestressing force is very small. Less than one part of three tensile stresses. 2 during the whole test loading process, and until the upper edge concrete finally collapses, there is no Anchorage failure of the carbon fiber plate, and the carbon fiber plate and the member are not stripped, the carbon fiber plate remains intact, The performance of CFRP and T-beam members is good, and the strengthening effect is close to that of normal micro-damage members, which indicates that the rapid strengthening of prestressed CFRP plate can recover and improve the bearing capacity and mechanical performance of the original structure. (3) theoretical analysis shows that the calculated results based on plane section assumption and internal force balance are in good agreement with the experimental results. It shows that the mechanical model based on the traditional plane section assumption can predict the working performance of flexural members strengthened with prestressed carbon fiber sheet. The above research on the rapid reinforcement of severely damaged components has a strong engineering application value to bridge emergency rescue, earthquake relief and other emergency situations, such as rapid recovery of the bearing capacity of bridges.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72

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本文編號：1935600