【摘要】：基于波形齒夾具錨的多點錨固預(yù)應(yīng)力CFRP加固技術(shù)是一項體外無粘結(jié)快速加固技術(shù)，該技術(shù)能夠可靠地實現(xiàn)CFRP材料的錨固與張拉，且施工方便快捷。經(jīng)過前期大量的靜載試驗和理論研究，證明了此加固技術(shù)的加固效果明顯、性能可靠。但是，關(guān)于多點錨固預(yù)應(yīng)力CFRP加固梁疲勞性能的研究才剛剛開始，在實驗受到周期長、成本高等因素制約的情況下，大量進(jìn)行疲勞實驗受到限制，模擬分析成為一種重要的研究手段。 以2根加固梁的疲勞實驗為基礎(chǔ)，對多點錨固預(yù)應(yīng)力CFRP加固鋼筋混凝土梁的疲勞性能進(jìn)行有限元模擬，，主要研究內(nèi)容及成果如下： ①采用與實驗梁實際材料相對應(yīng)的多種單元類型、材料本構(gòu)關(guān)系，建立多點錨固預(yù)應(yīng)力CFRP加固鋼筋混凝土梁的ANSYS有限元模型，分析了靜力荷載作用下構(gòu)件的開裂荷載、跨中撓度、中和軸高度變化、鋼筋應(yīng)力、CFRP應(yīng)力、混凝土應(yīng)變等性能，并通過計算結(jié)果與實驗結(jié)果的比較分析，驗證了有限元模型靜力分析方法的可靠性。 ②在靜力分析的基礎(chǔ)上，引入名義應(yīng)力法，采用ANSYS軟件估算多點錨固預(yù)應(yīng)力CFRP加固鋼筋混凝土梁的疲勞壽命，所得計算結(jié)果與實驗實測結(jié)果誤差較小，驗證了多點錨固預(yù)應(yīng)力CFRP加固鋼筋混凝土梁疲勞性能模擬分析方法的可靠性。 ③運用經(jīng)過驗證的模擬分析方法，考慮不同CFRP加固量、錨固點數(shù)量及間距和CFRP預(yù)應(yīng)力大小等因素的影響，開展多點錨固預(yù)應(yīng)力CFRP加固鋼筋混凝土梁的系列模擬分析，得到主要結(jié)論如下：1）增大加固量能夠大幅度地提高加固梁的極限承載力和疲勞壽命；2）錨固點位置及間距影響疲勞荷載作用下主筋危險破壞點位置；3）在本文研究范圍內(nèi)，預(yù)應(yīng)力能有效提高構(gòu)件極限承載力。三點錨固加固梁的疲勞壽命，在本文研究范圍內(nèi)隨預(yù)應(yīng)力的增大而延長，且幅度較大。四點錨固加固梁的疲勞壽命，在本文研究范圍內(nèi)隨中段CFRP預(yù)應(yīng)力的增大而縮短，隨邊段CFRP預(yù)應(yīng)力的增大而延長，延長或縮短的幅度均較小。
[Abstract]:Multi-point anchoring prestressed CFRP reinforcement based on corrugated tooth fixture anchors is a fast and unbonded external reinforcement technique. This technique can reliably realize the anchoring and tensioning of CFRP materials, and the construction is convenient and fast. After a large number of static load tests and theoretical studies, it is proved that the reinforcement effect of this reinforcement technology is obvious and the performance is reliable. However, the study on fatigue behavior of multi-point anchoring prestressed CFRP beams is just beginning, and a large number of fatigue experiments are limited under the constraints of long period and high cost. Simulation analysis has become an important research method. Based on the fatigue experiments of two strengthened beams, the fatigue behavior of reinforced concrete beams strengthened by multi-point anchoring prestressed CFRP is simulated by finite element method. The main research contents and results are as follows: 1 the ANSYS finite element model of reinforced concrete beams strengthened by multi-point anchoring prestressed CFRP is established by adopting various element types and constitutive relations corresponding to the actual materials of experimental beams. The cracking load, mid-span deflection, height change of the neutral axis, stress of steel bar CFRP, strain of concrete and so on are analyzed under static load, and the results are compared with the experimental results. The reliability of the static analysis method of finite element model is verified. 2 on the basis of static analysis, the fatigue life of reinforced concrete beams strengthened by multi-point anchoring prestressed CFRP is estimated by introducing the nominal stress method and using ANSYS software. The error between the calculated results and the experimental results is small, which verifies the reliability of the simulation analysis method for the fatigue behavior of reinforced concrete beams strengthened with multi-point anchoring prestressed CFRP. Considering the influence of different CFRP reinforcement amount, the number and spacing of anchoring points and the size of CFRP prestress, a series of simulation analysis of reinforced concrete beams strengthened with multi-point anchoring prestressed CFRP is carried out. The main conclusions are as follows: (1) the ultimate bearing capacity and fatigue life of the strengthened beam can be greatly improved by increasing the reinforcement amount. 2) the location of the dangerous failure point of the main reinforcement affected by the location and spacing of anchoring points under fatigue load is 3) within the scope of this paper. Prestress can effectively improve the ultimate bearing capacity of members. The fatigue life of three-point Anchorage strengthened beam is prolonged with the increase of prestress in this paper. The fatigue life of four-point Anchorage strengthened beam is shortened with the increase of CFRP prestress in the middle section and the increase of CFRP prestress in the side segment in this paper. The extension or shortening range of the fatigue life of four-point Anchorage beam is smaller.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU37

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 飛渭,江世永,彭飛飛,陳正平,李慶楓,陳龍;預(yù)應(yīng)力碳纖維布加固混凝土受彎構(gòu)件試驗研究[J];四川建筑科學(xué)研究;2003年02期

2 何初生;王文煒;楊威;葉見曙;;預(yù)應(yīng)力CFRP布加固鋼筋混凝土梁疲勞性能試驗研究[J];東南大學(xué)學(xué)報(自然科學(xué)版);2011年04期

3 尚守平;彭暉;曾令宏;;預(yù)應(yīng)力碳纖維布材加固混凝土梁受彎性能非線性分析[J];工程力學(xué);2006年11期

4 張鑫;李安起;趙考重;;建筑結(jié)構(gòu)鑒定與加固改造技術(shù)的進(jìn)展[J];工程力學(xué);2011年01期

5 趙啟林,王景全,金廣謙,孫寶俊;碳纖維加固的“反拱預(yù)應(yīng)力技術(shù)”及其提高鋼結(jié)構(gòu)承載能力的分析[J];鋼結(jié)構(gòu);2002年03期

6 曾紅權(quán);;碳纖維布加固鋼筋混凝土梁疲勞試驗荷載計算[J];甘肅科技;2010年24期

7 陳志立,肖燕;預(yù)應(yīng)力碳纖維布加固混凝土受彎構(gòu)件分析[J];國外建材科技;2004年03期

8 葉列平,莊江波,曾攀,周小蓉,沙吾列提·拜開依,楊勇新;預(yù)應(yīng)力碳纖維布加固鋼筋混凝土T形梁的試驗研究[J];工業(yè)建筑;2005年08期

9 梅力彪;張俊平;;預(yù)應(yīng)力碳纖維板加固混凝土梁的粘結(jié)錨固性能試驗研究[J];工業(yè)建筑;2006年04期

10 張軻;葉列平;岳清瑞;;預(yù)應(yīng)力碳纖維布加固混凝土梁疲勞壽命分析[J];工業(yè)建筑;2008年07期

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