【摘要】：近年來，，由于地震、環(huán)境侵蝕、超載等因素的影響，國內(nèi)外大量的橋梁存在不同程度損傷。對于存在病害的橋梁，采用纖維增強復(fù)合材料對其進行加固是一種經(jīng)濟合理的解決方法。與傳統(tǒng)加固方法相比，粘貼纖維布加固構(gòu)件時截面質(zhì)量增加極少，又因其具有可加工性和易操作性，在結(jié)構(gòu)加固中具有明顯的優(yōu)勢。玄武巖纖維作為一種新型纖維增強復(fù)合材料，與其它纖維相比具有優(yōu)異的性能，在延性、抗腐蝕和耐高溫方面高于碳纖維，生產(chǎn)原料來源廣泛，價格低廉。因此，開展玄武巖纖維布加固鋼筋混凝土構(gòu)件試驗研究具有重要的經(jīng)濟和社會效益。 本文以既有損傷鋼筋混凝土梁為研究對象，開展了玄武巖纖維布粘貼層數(shù)、混凝土表面處理方式及梁端錨固件數(shù)量和類型對加固梁抗彎力學(xué)性能影響試驗研究。本文主要工作內(nèi)容如下： (1)將兩根試驗梁加載至破壞，得到其開裂荷載和極限荷載。然后，對其他試驗梁進行預(yù)加載至開裂。 (2)在加載預(yù)裂試驗梁底粘貼不同層數(shù)（1～5層）玄武巖纖維布進行加固，然后對加固梁進行靜力加載，分析了玄武巖纖維布層數(shù)對加固效果的影響。 (3)首先對混凝土表面進行鑿毛處理，然后在試驗梁底粘貼相同層數(shù)玄武巖纖維布加固，分析了梁底處理方式對加固效果的影響。 (4)改變梁端錨固件數(shù)量和類型，對玄武巖纖維布加固梁進行試驗，分析了梁端錨固方式對加固效果的影響。 本文主要結(jié)論如下： (1)試驗梁極限承載力隨玄武巖纖維布粘貼層數(shù)的增加而不斷增大，但不呈線性關(guān)系，粘貼2～4層玄武巖纖維布時承載力提高最為顯著，超過4層后纖維布發(fā)生剝離破壞。 (2)梁底鑿毛處理可以有效避免粘貼界面處發(fā)生剝離破壞，提高了玄武巖纖維布的粘結(jié)加固效果。 (3)梁端錨固件是影響試驗梁承載力的關(guān)鍵因素之一，錨固件越可靠，加固梁受力狀態(tài)越良好，極限承載力越高，跨中撓度也相應(yīng)減小；錨固件數(shù)量足夠的情況下，繼續(xù)增加錨固件數(shù)量或改變梁端錨固件的類型對加固效果的影響較小。 (4)玄武巖纖維布對試驗梁裂縫的開展具有一定的抑制和延緩作用，同時可提高試驗梁的整體抗彎剛度，使跨中撓度有所降低。 (5)采用玄武巖纖維布加固的混凝土梁跨中截面應(yīng)變近似符合平截面假定。
[Abstract]:In recent years, due to earthquake, environmental erosion, overloading and other factors, a large number of bridges at home and abroad have different degrees of damage. It is an economical and reasonable solution to reinforce bridges with fiber reinforced composites. Compared with the traditional strengthening method, the cross-section mass of the reinforced member with fiber sheet is increased little, and it has obvious advantage in the structural strengthening because of its machinability and easy operation. Basalt fiber, as a new type of fiber reinforced composite, has excellent properties compared with other fibers. It is superior to carbon fiber in ductility, corrosion resistance and high temperature resistance, and has a wide range of raw materials and low price. Therefore, it has important economic and social benefits to carry out experimental research on strengthening reinforced concrete members with basalt fiber sheet. Based on the existing damaged reinforced concrete beams, the influence of the number of basalt fiber adhesive layers, the concrete surface treatment methods and the number and type of anchors at the end of the beam on the bending resistance of the reinforced beams has been studied in this paper. The main contents of this paper are as follows: (1) the cracking load and ultimate load of two test beams are obtained by loading them into failure. Then, other test beams are preloaded until cracking. (2) the basalt fiber sheets with different layers (1 ~ 5 layers) were pasted on the bottom of the pre-crack test beam for strengthening, and then the reinforced beams were subjected to static loading, and the influence of the number of basalt fiber sheets on the strengthening effect was analyzed. (3) at first, the surface of concrete is drilled, then the same number of basalt fiber sheets are pasted on the bottom of the test beam, and the influence of the beam bottom treatment on the reinforcement effect is analyzed. (4) changing the number and type of beam end anchors, the experiment is carried out to strengthen the beam with basalt fiber sheet, and the influence of beam end anchoring mode on the reinforcement effect is analyzed. The main conclusions of this paper are as follows: (1) the ultimate bearing capacity of the test beam increases with the increase of the number of basalt fiber sheets, but there is no linear relationship, and the ultimate bearing capacity of the test beam increases most significantly when the basalt fiber cloth is pasted with 2 ~ 4 layers of basalt fiber. After more than 4 layers, the fiber cloth was stripped and destroyed. (2) the beam bottom drilling treatment can effectively avoid the peeling failure at the pasted interface and improve the bonding and strengthening effect of basalt fiber sheets. (3) the anchors at the end of the beam are one of the key factors affecting the bearing capacity of the test beams. The more reliable the anchors are, the better the load-bearing state of the strengthened beams is, the higher the ultimate bearing capacity is, and the less the mid-span deflection is. If the number of anchors is sufficient, increasing the number of anchors or changing the type of anchors at the end of the beam has little effect on the reinforcement effect. (4) basalt fiber cloth can restrain and delay the crack development of the test beam, at the same time, it can improve the overall flexural stiffness of the test beam and reduce the deflection of the middle span. (5) the strain of mid-span section of concrete beam strengthened by basalt fiber sheet approximately accords with the assumption of plane section.
【學(xué)位授予單位】：天津城建大學(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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