發(fā)布時(shí)間：2018-01-19 23:14

  本文關(guān)鍵詞： FRP 混凝土 可靠度 加固梁　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：纖維增強(qiáng)復(fù)合材料(FRP)是一種具有很高使用價(jià)值的新型材料,種類繁多,價(jià)格經(jīng)濟(jì),與其他材料相比,它具有抗拉性好,質(zhì)量較輕,耐腐蝕,使用方便等顯著優(yōu)點(diǎn),因此在土木工程中得到了廣泛的運(yùn)用,由于我國建筑業(yè)面臨著大量建筑需要修復(fù)與加固的問題,使用FRP對(duì)建筑進(jìn)行加固的技術(shù)也越來越完善和成熟了,對(duì)于使用FRP加固的受彎破壞與承受力分析,國內(nèi)外學(xué)者都進(jìn)行過相關(guān)研究,并且提出了許多具有實(shí)際應(yīng)用價(jià)值的模型,國家在這方面也較為重視,頒布了相關(guān)的設(shè)計(jì)規(guī)范。本文對(duì)FRP抗彎加固混凝土鋼筋梁的四種具有代表性的破壞模式進(jìn)行了分析,主要通過蒙特卡洛模擬的方法進(jìn)行了相關(guān)的可靠度分析,除此之外,還對(duì)中美設(shè)計(jì)規(guī)范的差異進(jìn)行了比較,本文工作及主要?jiǎng)?chuàng)新之處在于:(1)從國內(nèi)外相關(guān)文獻(xiàn)中收集關(guān)于FRP抗彎加固鋼筋混凝土梁的有關(guān)試驗(yàn)數(shù)據(jù),并且以此為基礎(chǔ)建立一個(gè)龐大的數(shù)據(jù)庫,并且,在此基礎(chǔ)上,使用統(tǒng)計(jì)軟件SPSS進(jìn)行各個(gè)因素的方差分析,最終研究得出各個(gè)基本變量對(duì)于FRP共享比例。最終得出結(jié)論:混凝土軸心抗壓強(qiáng)度,鋼筋縱向配筋率,FRP截面配布率對(duì)FRP貢獻(xiàn)比例有顯著影響。(2)收集和整理現(xiàn)有文獻(xiàn)對(duì)于FRP抗彎加固梁可靠度計(jì)算所涉及的各隨機(jī)變量的統(tǒng)計(jì)特征的取值。另外,考慮到混凝土和FRP兩種材料的強(qiáng)度對(duì)承載力較敏感,對(duì)600個(gè)混凝土試塊進(jìn)行立方體抗壓以及50個(gè)FRP試件進(jìn)行單軸拉伸試驗(yàn),旨在得到這兩種材料的力學(xué)性能的統(tǒng)計(jì)特征。分析試驗(yàn)結(jié)果結(jié)合現(xiàn)有文獻(xiàn),本文對(duì)于混凝土軸心抗壓強(qiáng)度的均值與名義值之比取1.25,變異系數(shù)取0.15;FRP極限抗拉強(qiáng)度分別取1.15和0.1;FRP的彈性模量分別取1.0和0.04。(3)用中美規(guī)范的模型建立極限承載力的狀態(tài)方程,然后通過計(jì)算,得出中國與美國的設(shè)計(jì)規(guī)范在可靠度方面的差異,還有變量對(duì)可靠度的影響情況。(4)根據(jù)Monte Carlo-JC法和Monte Carlo法分別編制了基于Matalb的計(jì)算程序,計(jì)算了海洋環(huán)境下混凝土梁加固前后的時(shí)變可靠度。同時(shí)通過對(duì)比兩種可靠度計(jì)算方法,證明Monte Carlo-JC法是一種高效率的可靠度計(jì)算。
[Abstract]:Fiber reinforced composite (FRP) is a new material with high use value. It has many kinds of materials and is economical in price. Compared with other materials, FRP has good tensile resistance, light quality and corrosion resistance. Because of its obvious advantages, such as ease of use, it has been widely used in civil engineering, because the construction industry in our country is faced with a large number of problems of repair and reinforcement. The technology of using FRP to reinforce the building has become more and more perfect and mature. The domestic and foreign scholars have carried on the related research to the bending failure and the endurance analysis of using the FRP reinforcement. And put forward a lot of practical application value of the model, in this respect, the country also pay more attention to. In this paper, four representative failure modes of reinforced concrete beams strengthened with FRP bending are analyzed. In addition to the reliability analysis by Monte Carlo simulation, the differences between Chinese and American design specifications are compared. The main innovation of this paper lies in the collection of relevant experimental data on reinforced concrete beams strengthened with FRP flexural strength from domestic and foreign literature, and the establishment of a large database based on this data. And on this basis, using the statistical software SPSS to carry out the analysis of variance of each factor, the final study of the basic variables for the FRP share ratio. Finally, the conclusion: concrete axial compressive strength. Longitudinal reinforcement ratio. The distribution ratio of FRP section has a significant effect on the contribution ratio of FRP. (2) collecting and arranging the statistical characteristics of each random variable involved in the reliability calculation of FRP flexural strengthening beam. In addition. Considering that the strength of concrete and FRP is sensitive to the bearing capacity, 600 concrete specimens are tested under cube compression and 50 FRP specimens are subjected to uniaxial tensile test. The purpose of this paper is to obtain the statistical characteristics of the mechanical properties of the two kinds of materials. The experimental results are combined with the existing literature, and the ratio of the mean to nominal value of the axial compressive strength of concrete is 1.25 in this paper. The coefficient of variation was 0.15; The ultimate tensile strength of FRP is 1.15 and 0.1 respectively. The elastic modulus of FRP is taken as 1.0 and 0.04. 3 respectively) the state equation of ultimate bearing capacity is established by using the model of Chinese and American codes, and then calculated. The differences in reliability between Chinese and American design codes are obtained. And the influence of variables on reliability. 4) according to the Monte Carlo-JC method and Monte Carlo method, the calculation programs based on Matalb are developed respectively. The time-varying reliability of concrete beams before and after reinforcement in marine environment is calculated, and the Monte Carlo-JC method is proved to be a high efficiency reliability calculation by comparing two reliability calculation methods.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 高仲學(xué);楊威;;CFRP布加固鋼筋混凝土梁可靠性分析[J];土木建筑與環(huán)境工程;2011年06期

2 杜斌;趙人達(dá);;外貼碳纖維布加固既有橋梁的可靠度指標(biāo)計(jì)算分析[J];四川建筑科學(xué)研究;2010年02期

3 楊勇新;;碳纖維布加固混凝土梁的可靠度分析[J];建筑結(jié)構(gòu)學(xué)報(bào);2008年S1期

4 何政;李光;;基于可靠度的FRP筋材料分項(xiàng)系數(shù)的確定[J];工程力學(xué);2008年09期

5 阮金奎;;常見建筑結(jié)構(gòu)加固方法選擇與優(yōu)缺點(diǎn)[J];山西建筑;2008年10期

6 何政;黃永春;;應(yīng)用Monte Carlo-JC法評(píng)估FRP加固RC梁受彎承載力可靠度[J];復(fù)合材料學(xué)報(bào);2007年01期

7 孫曉燕,黃承逵,孫保沭;既有橋梁外貼纖維布加固后可靠度分析[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年03期

8 王文煒,趙國藩,黃承逵,任海東;碳纖維布加固已承受荷載的鋼筋混凝土梁抗彎性能試驗(yàn)研究及抗彎承載力計(jì)算[J];工程力學(xué);2004年04期

9 李榮,滕錦光,岳清瑞;FRP材料加固混凝土結(jié)構(gòu)應(yīng)用的新領(lǐng)域——嵌入式(NSM)加固法[J];工業(yè)建筑;2004年04期

10 ;建設(shè)部關(guān)于發(fā)布國家標(biāo)準(zhǔn)《普通混凝土力學(xué)性能試驗(yàn)方法標(biāo)準(zhǔn)》的公告[J];工程建設(shè)標(biāo)準(zhǔn)化;2003年01期

相關(guān)博士學(xué)位論文 前1條

1 徐福泉;碳纖維布加固鋼筋混凝土梁靜載性能研究[D];中國建筑科學(xué)研究院;2001年

，

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