發(fā)布時(shí)間：2018-07-04 08:47

  本文選題：碳纖維布 + 鋼板�。� 參考：《煙臺(tái)大學(xué)》2017年碩士論文

【摘要】：對(duì)房屋進(jìn)行管道安裝改造時(shí),為了不影響層高需要在梁的腹板上開較大的洞口,以滿足多管或大口徑管道穿過的需求,具有良好的綜合經(jīng)濟(jì)效益。然而在腹板上開洞會(huì)嚴(yán)重削弱梁的抗剪承載力,因此必須對(duì)開洞梁采取一定的加固措施來提高梁的整體受力性能。展開對(duì)開大洞口鋼筋混凝土梁的加固研究,找到合理高效的開洞加固形式,為工程的實(shí)際應(yīng)用提供可靠的理論基礎(chǔ),具有非常重要的意義。本文通過對(duì)3組試件進(jìn)行彎曲試驗(yàn),探討了在不同孔洞參數(shù)和加固形式下RC開洞梁的裂縫開展破壞情況,并進(jìn)行了受力性能的對(duì)比分析。試驗(yàn)分析結(jié)果表明:分別粘貼碳纖維布和鋼板對(duì)開洞梁加固,都有效地約束了裂縫的開展,使開洞梁的抗剪承載力得到顯著提高。二者對(duì)承載能力的提高幅度相差不大,采用碳纖維布加固相對(duì)偏高。就施工工藝而言,采用碳纖維布加固更為簡(jiǎn)便經(jīng)濟(jì),但鋼板加固對(duì)梁剛度增強(qiáng)較為顯著。洞口大小的變化對(duì)開洞梁的加固效果具有較大的影響,會(huì)使加固梁最終發(fā)生不同的破壞形態(tài)。此外,加固材料與混凝土之間的粘結(jié)作用也是影響開洞梁加固的效果一個(gè)重要因素。在試驗(yàn)的基礎(chǔ)上,采用TNO DIANA軟件建立有限元模型對(duì)腹板開洞鋼筋混凝土梁進(jìn)行研究,利用試驗(yàn)結(jié)果對(duì)有限元模型進(jìn)行了有效性檢驗(yàn)和參數(shù)校正。通過分別對(duì)碳纖維布和鋼板加固的開洞梁孔洞參數(shù)(包括開洞高度、開洞長(zhǎng)度等)的設(shè)置分析,探討了孔洞參數(shù)的改變對(duì)開洞加固梁受力性能的影響。結(jié)果表明:碳纖維布和鋼板對(duì)開洞RC梁的加固效果都非常明顯,但開洞不易過大,過長(zhǎng)或過高都會(huì)對(duì)加固效果產(chǎn)生很大的影響,開洞高度相比開洞長(zhǎng)度對(duì)加固梁的抗剪承載能力和剪切剛度的影響更大。本文基于試驗(yàn)結(jié)果與有限元參數(shù)分析,對(duì)分別采用碳纖維布和鋼板加固的較大洞口的開洞梁的抗剪性能進(jìn)行了深入研究,探索了不同開洞參數(shù)對(duì)加固效果的影響,為腹板開洞RC梁加固的實(shí)際工程應(yīng)用提供了可靠的理論基礎(chǔ)。
[Abstract]:In order to avoid the influence of floor height on the installation and reconstruction of the building, a large opening should be opened on the web of the beam to meet the needs of multi-pipe or large-caliber pipeline, which has good comprehensive economic benefits. However, opening a hole in the web will seriously weaken the shear capacity of the beam, so it is necessary to take some reinforcement measures to improve the overall mechanical performance of the beam. It is of great significance to study the reinforcement of reinforced concrete beams with large openings and find a reasonable and efficient reinforcement form for the practical application of the project. Based on the bending tests of three groups of specimens, the fracture failure of RC beams with open holes under different hole parameters and reinforcement forms is discussed, and the mechanical properties of RC beams are compared and analyzed. The experimental results show that the crack development is restrained effectively and the shear bearing capacity of the open beam is improved significantly by bonding carbon fiber sheet and steel plate respectively to strengthen the open hole beam. The increase of bearing capacity is not different between them, and the reinforcement of CFRP is relatively high. In terms of construction technology, it is more convenient and economical to reinforce with carbon fiber sheet, but the rigidity of beam strengthened by steel plate is obvious. The change of the hole size has a great influence on the reinforcement effect of the beam, which will lead to different failure patterns of the strengthened beam. In addition, the bond between reinforcement material and concrete is also an important factor affecting the reinforcement effect of open beam. On the basis of the experiment, the finite element model of the web opening reinforced concrete beam is established by TNO Diana software. The validity of the finite element model and the parameter correction are verified by the test results. Through setting and analyzing the hole parameters (including the height and length of the hole) of the beam strengthened with carbon fiber sheet and steel plate respectively, the influence of the change of the hole parameters on the mechanical performance of the beam strengthened with the hole is discussed. The results show that the reinforcement effect of carbon fiber sheet and steel plate is very obvious, but the hole opening is not easy to be too large, too long or too high will have a great effect on the reinforcement effect. The height of the hole has more influence on the shear bearing capacity and shear stiffness of the strengthened beam than the length of the hole. Based on the experimental results and finite element parameter analysis, the shear behavior of large hole beam strengthened with carbon fiber sheet and steel plate is studied in this paper, and the influence of different hole opening parameters on the reinforcement effect is explored. It provides a reliable theoretical basis for the practical engineering application of RC beams strengthened with web openings.
【學(xué)位授予單位】：煙臺(tái)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

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本文編號(hào)：2095507