本文選題：鋼筋混凝土 + 梁��； 參考：《華僑大學(xué)》2013年碩士論文

【摘要】：碳纖維增強(qiáng)復(fù)合材料(Carbon Fiber Reinforced Polymer，簡(jiǎn)稱CFRP)在火災(zāi)后混凝土結(jié)構(gòu)的加固修復(fù)中得到一定應(yīng)用。然而，目前有關(guān)火災(zāi)后混凝土梁抗剪加固方面的研究工作未見文獻(xiàn)報(bào)道。為此，本文從試驗(yàn)、數(shù)值計(jì)算兩方面研究了CFRP加固火災(zāi)后混凝土梁的抗剪性能及其設(shè)計(jì)方法。另外，，本文還比較了未受火時(shí)不同規(guī)范的混凝土梁抗剪加固式中CFRP抗剪貢獻(xiàn)的計(jì)算方法。本文的主要工作和結(jié)論如下： 1.收集了國(guó)內(nèi)外22根側(cè)面粘貼、26根U形粘貼、28根全包裹粘貼CFRP加固混凝土梁的CFRP抗剪貢獻(xiàn)值的試驗(yàn)結(jié)果。針對(duì)不同的粘貼方式，分別進(jìn)行了美國(guó)規(guī)范、歐洲規(guī)范和中國(guó)規(guī)范共三種規(guī)范的計(jì)算值與試驗(yàn)值的對(duì)比分析，并對(duì)我國(guó)規(guī)范的不足提出了部分修正和建議。結(jié)果表明：歐洲規(guī)范的設(shè)計(jì)計(jì)算公式對(duì)側(cè)面粘貼情況的預(yù)測(cè)結(jié)果較好；對(duì)U形粘貼情況，中國(guó)規(guī)范的設(shè)計(jì)計(jì)算公式的預(yù)測(cè)結(jié)果較不可靠；對(duì)封閉包裹情況，三種加固規(guī)范的計(jì)算結(jié)果均與實(shí)驗(yàn)值吻合較好，其中中國(guó)規(guī)范的精度最高。 2.開展了2根未受火梁、2根火災(zāi)后混凝土梁、4根CFRP加固火災(zāi)后混凝土梁的四點(diǎn)加載試驗(yàn)，主要研究參數(shù)為剪跨比、CFRP加固量和樓板翼緣。試驗(yàn)結(jié)果表明：(1)混凝土梁遭受火災(zāi)高溫后，其極限承載力顯著降低。寬200mm、高300mm的梁受火1h后試件的抗剪承載力降低9.5%。(2) CFRP加固能將火災(zāi)后混凝土梁的抗剪承載力提升至未受火試件的105.3%~134.3%，且考慮樓板翼緣的影響，采用“U形包裹+壓條”方式加固混凝土梁可取得較好的加固效果。(3)CFRP加固火災(zāi)后混凝土梁，可顯著提高其極限變形能力，且提高程度隨CFRP加固量的增加而增強(qiáng)。(4)梁的剪跨比對(duì)CFRP布的加固效果影響較大，剪跨比越大，加固效果越好。 3.利用程序RCSSCF計(jì)算了等截面修復(fù)后梁截面的混凝土抗拉強(qiáng)度平均折減系數(shù)，建議了CFRP加固火災(zāi)后混凝土梁抗剪承載力的實(shí)用計(jì)算公式。
[Abstract]:Carbon fiber reinforced composite (Carbon Fiber Reinforced Polymer, abbreviated as CFRP) has been applied to the reinforcement and repair of concrete structures after fire. However, there is no literature on the study of the shear reinforcement of concrete beams after the fire. For this reason, this paper has studied two aspects of the experiment and numerical calculation of the concrete beams after the fire. In addition, the calculation method of CFRP shear contribution in shear reinforcement of concrete beams with different specifications is also compared. The main work and conclusion of this paper are as follows:
1. the experimental results of the CFRP shear contribution values of 22 side paste, 26 U shaped paste and 28 full wrapped CFRP reinforced concrete beams were collected. The comparison and analysis of the calculated values and the experimental values of three specifications in the United States, Europe and China were carried out respectively. Some amendments and suggestions are put forward. The results show that the prediction results of the design calculation formula of the European standard are better for the side paste situation; for the U shape paste, the prediction results of the Chinese standard design calculation formula are not reliable. The results of the three kinds of reinforcement codes are in good agreement with the experimental values, among them, the results of the calculation are in good agreement with the experimental values. The national standard has the highest precision.
2. to carry out 2 unfired beams, 2 post fire concrete beams and 4 CFRP reinforced concrete beams after the four point loading test. The main parameters are the shear span ratio, the CFRP reinforcement and the floor flange. The test results show that (1) the ultimate load bearing capacity of concrete beams is significantly reduced after the fire is subjected to high temperature. The width of 200mm and the high 300mm beam are subjected to the 1H post test. 9.5%. (2) CFRP reinforcement can improve the shear bearing capacity of concrete beams after fire to the 105.3%~134.3% of unfired specimens after the fire, and the reinforcement of concrete beams with "U parcel + bar" can achieve better reinforcement effect. (3) CFRP reinforced concrete beams can be significantly improved by CFRP. The ultimate deformation capacity and the degree of improvement are enhanced with the increase of CFRP reinforcement. (4) the shear span ratio of the beams has a greater effect on the reinforcement effect of the CFRP cloth, and the greater the shear span ratio, the better the reinforcement effect.
3. using the program RCSSCF to calculate the average reduction coefficient of the concrete tensile strength of the cross section of the rear beam, and suggests a practical formula for the CFRP reinforcement of the shear bearing capacity of the concrete beams after the fire.

【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375.1

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