本文選題：玄武巖纖維布 + 加固�。� 參考：《石河子大學(xué)》2017年碩士論文

【摘要】：目前,我國(guó)存在大量的混凝土結(jié)構(gòu)由于材料老化、荷載變化等迫切需要進(jìn)行一定程度的加固及修復(fù)處理。纖維增強(qiáng)復(fù)合材料以其突出的力學(xué)性能、良好的耐久性以及便捷的施工優(yōu)勢(shì),近年來(lái)在結(jié)構(gòu)加固改造中得到了廣泛應(yīng)用。本文通過(guò)對(duì)玄武纖維布加固鋼筋混凝土梁的抗彎性能進(jìn)行研究,分析了不同纖維布加固量、不同U型箍錨固方式及不同鋼板加固量對(duì)加固效果的影響,得到以下結(jié)論:(1)粘貼玄武巖纖維布后,加固梁的開(kāi)裂荷載、屈服荷載、極限荷載都有不同程度的提高,尤其是極限荷載提高幅度最大,極限荷載分別提高8%(1層)、23%(2層)、29%(3層),加固效果明顯。(2)對(duì)比不同粘貼層數(shù)的加固梁承載力發(fā)現(xiàn),隨著纖維布層數(shù)的增加,加固梁抗彎承載力也在不斷提高,但其提高程度并不與纖維布粘貼層數(shù)成正比。設(shè)置U型箍可以有效防止纖維布發(fā)生剝離破壞,但對(duì)加固梁承載力的提高作用并不明顯。(3)使用玄武巖纖維布加固可以有效抑制試驗(yàn)梁裂縫的發(fā)展,與基準(zhǔn)梁相比,加固梁裂縫數(shù)量多,平均間距小,裂縫分布較均勻,裂縫發(fā)展速度慢。(4)通過(guò)對(duì)加固梁荷載-撓度曲線分析可知,使用玄武巖纖維布加固的鋼筋混凝土梁的剛度與基準(zhǔn)梁相比有一定程度的提高,且隨著加固層數(shù)的增加,剛度提高更明顯。設(shè)置U型箍對(duì)加固梁剛度影響不大,但可以有效抑制玄武巖纖維布的早期剝離,使加固梁后期撓度不斷增加,延性系數(shù)提高,梁的延性得到改善。(5)鋼板與纖維布聯(lián)合加固,能夠彌補(bǔ)單一材料加固法的不足,在有效提高受損混凝土梁剛度和承載力的同時(shí)還能夠更好的改善混凝土結(jié)構(gòu)的延性,加固效果更好。(6)推導(dǎo)了不同破壞形式下玄武巖纖維布加固鋼筋混凝土梁的正截面承載力計(jì)算公式,并用試驗(yàn)結(jié)果進(jìn)行驗(yàn)證,結(jié)果表明極限承載力的計(jì)算值與實(shí)測(cè)值符合良好,且計(jì)算結(jié)果偏于安全。
[Abstract]:At present, a large number of concrete structures in our country need to be strengthened and repaired to a certain extent because of the aging of materials and the change of load. Fiber reinforced composites have been widely used in structural strengthening and reconstruction in recent years because of their outstanding mechanical properties, good durability and convenient construction advantages. In this paper, the flexural behavior of reinforced concrete beams strengthened with Black Tortoise fiber sheets is studied, and the effects of different fiber sheets, different U-hoop anchoring methods and different steel plate reinforcement on the strengthening effect are analyzed. The following conclusion is drawn: (1) when the basalt fiber cloth is bonded, the cracking load, yield load and ultimate load of the strengthened beam are increased in varying degrees, especially the ultimate load. The ultimate load is increased by 8 / 10 / 1 / 2 / 2 / 2 / 2 / 2 / 2 / 3 / 3, respectively, and the effect of strengthening is obvious. (2) compared with the bearing capacity of beams with different adhesive layers, it is found that the flexural bearing capacity of the strengthened beams increases with the increase of the number of fiber layers, and the flexural bearing capacity of the strengthened beams is also increasing with the increase of the number of fiber layers. However, the degree of improvement is not proportional to the number of layers attached to the fabric. U type hoop can effectively prevent fiber cloth from peeling, but the effect of strengthening beam bearing capacity is not obvious.) using basalt fiber cloth can effectively restrain the development of test beam crack, compared with reference beam. Through the analysis of load-deflection curves of strengthened beams, the number of cracks is large, the average spacing is small, the distribution of cracks is more uniform, and the crack development speed is slow. The stiffness of reinforced concrete beams strengthened with basalt fiber sheets is higher than that of reference beams to a certain extent, and the stiffness increases more obviously with the increase of the number of strengthened layers. The installation of U-type hoop has little effect on the stiffness of the strengthened beam, but it can effectively restrain the early exfoliation of the basalt fiber cloth, so that the deflection of the strengthened beam in the later stage increases continuously, the ductility coefficient increases, the ductility of the beam is improved, and the ductility of the beam is improved by the combination of steel plate and fiber cloth. It can make up for the deficiency of single material strengthening method and can improve the ductility of concrete structure while improving the stiffness and bearing capacity of damaged concrete beam. The calculation formula of normal section bearing capacity of reinforced concrete beams strengthened by basalt fiber sheets under different failure forms is derived. The results are verified by the experimental results. The results show that the calculated values of ultimate bearing capacity are in good agreement with the measured values. The calculated results are more secure.
【學(xué)位授予單位】：石河子大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.1

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