發(fā)布時間：2018-03-17 22:21

  本文選題：RC圓柱　切入點(diǎn)：承載能力　出處：《華南理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：因地震等自然災(zāi)害、年久失修及人為因素等影響，現(xiàn)有橋墩出現(xiàn)了諸如承載力不足、延性較差等不同程度的問題，亟需對其進(jìn)行加固補(bǔ)強(qiáng)。纖維增強(qiáng)復(fù)合材料（FRP）片材因其高強(qiáng)高效、輕質(zhì)、適應(yīng)性強(qiáng)等特點(diǎn)使其在土木工程中的應(yīng)用越來越廣泛。使用FRP材料包裹鋼筋混凝土（RC）柱能夠有效地提高RC柱的受剪承載力，改善RC柱的延性。為此，本文采用本課題組發(fā)明的新型FRP片材——碳纖維薄板（CFL）和芳綸纖維薄板（AFL）加固RC圓柱，并對纖維薄板加固RC柱的承載能力進(jìn)行探討，主要研究內(nèi)容和研究結(jié)果如下： 1）本文首先以RC柱“強(qiáng)剪弱彎”的設(shè)計理念為出發(fā)點(diǎn)，研究FRP加固RC圓柱抗剪承載力的計算方法。對《碳纖維片材加固修復(fù)混凝土結(jié)構(gòu)技術(shù)規(guī)范》、葉列平建議公式、ISIS規(guī)范、CEB規(guī)范等文獻(xiàn)中記載的關(guān)于FRP加固RC圓柱抗剪承載力的計算方法進(jìn)行對比分析，并對收集到的25根加固柱的實(shí)驗(yàn)結(jié)果進(jìn)行驗(yàn)算，探討了各公式計算結(jié)果的可靠性和FRP的抗剪貢獻(xiàn)值，提出了實(shí)用建議公式。 2）采用本課題組研發(fā)的纖維薄板加固RC圓柱，并對其進(jìn)行擬靜力實(shí)驗(yàn)研究。RC圓柱的加固方式分AFL螺旋纏繞和CFL豎向粘貼加固。根據(jù)實(shí)驗(yàn)測量數(shù)據(jù)，對圓柱加固前后的破壞形態(tài)、承載能力、位移延性系數(shù)、滯回曲線、骨架曲線、荷載退化、剛度退化及纖維應(yīng)變分布等進(jìn)行了分析。研究結(jié)果表明，加固柱的承載力和延性均得到了顯著的提高，荷載退化和剛度退化均小于未加固柱，且在側(cè)向位移較大時其水平承載力表現(xiàn)得較為穩(wěn)定；沿柱高方向從上到下纖維應(yīng)變呈遞增分布，柱底部纖維發(fā)揮更為充分。 3）采用有限元分析軟件ANSYS對纖維薄板加固RC柱的承載能力進(jìn)行有限元計算，并與實(shí)驗(yàn)結(jié)果進(jìn)行對比分析。研究結(jié)果表明，有限元計算結(jié)果與實(shí)驗(yàn)結(jié)果吻合得較好。利用上述有限元分析模型，探討了纖維用量、纖維纏繞高度、軸壓比、是否受載加固等因素對AFL加固RC柱極限承載力和延性的影響。有限元分析結(jié)果表明，，AFL加固RC圓柱的增強(qiáng)作用并不隨AFL纏繞厚度的增加呈線性增長；在柱塑性鉸區(qū)纏繞AFL就能夠達(dá)到良好的加固效果；隨著軸壓比的增大，RC柱水平承載力有所提高，但延性會降低；受載加固柱的延性相對于非受載加固柱有所降低。
[Abstract]:Due to natural disasters such as earthquakes, years of disrepair and human factors, the existing piers have had problems of varying degrees, such as insufficient bearing capacity and poor ductility. It is urgent to reinforce and strengthen it. Fiber reinforced composite material (FRP) sheet is of high strength, high efficiency and light weight. The application of RC columns in civil engineering is more and more extensive due to its strong adaptability. The use of reinforced concrete columns wrapped with FRP materials can effectively increase the shear capacity of RC columns and improve the ductility of RC columns. In this paper, a new type of FRP sheet, carbon fiber sheet (CFL) and aramid fiber sheet (AFL), are used to reinforce RC columns, and the load-bearing capacity of RC columns strengthened by fiber sheet is discussed. The main research contents and results are as follows:. 1) in this paper, the design concept of "strong shear and weak bending" for RC columns is first taken as the starting point. This paper studies the calculation method of shear bearing capacity of RC columns strengthened with FRP. For the Technical Code for strengthening and repairing concrete structures with CFRP sheet, the suggested formula of Ye Leping and the Code of FRP for RC columns are recorded in the literature on shear resistance of RC columns strengthened by FRP. The calculation method of bearing capacity is compared and analyzed. The experimental results of 25 reinforced columns collected are checked, the reliability of the calculation results and the shear contribution of FRP are discussed, and the practical formulas are put forward. 2) the fiber thin plate developed by our research group is used to reinforce RC cylinder, and its quasi-static experimental study is carried out. The reinforcement method of RC cylinder is divided into AFL spiral winding and CFL vertical bonding reinforcement. According to the experimental data, the failure form of the column before and after strengthening is studied. The load-bearing capacity, displacement ductility coefficient, hysteretic curve, skeleton curve, load degradation, stiffness degradation and fiber strain distribution are analyzed. Load degradation and stiffness degradation are smaller than those of unreinforced columns, and the horizontal bearing capacity is stable when the lateral displacement is large, and the fiber strain increases gradually from top to bottom along the direction of column height, and the fiber at the bottom of the column plays more fully. 3) the finite element analysis software ANSYS is used to calculate the bearing capacity of RC columns strengthened by fiber thin plates, and the results are compared with the experimental results. The results of finite element calculation are in good agreement with the experimental results. Using the above finite element analysis model, the fiber dosage, filament winding height and axial compression ratio are discussed. The finite element analysis results show that the reinforcement of RC columns strengthened by AFL does not increase linearly with the increase of AFL winding thickness. With the increase of axial compression ratio, the horizontal bearing capacity of RC columns increases, but the ductility decreases. The ductility of loaded columns is lower than that of unloaded columns.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375.3;U445.72

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