本文選題：鋼筋混凝土梁 + FRP板�。� 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：Fiber Reinforced Plastic,簡稱FRP;我國稱為纖維增強(qiáng)復(fù)合材料,因?yàn)閮?yōu)點(diǎn)比較多:密度小、強(qiáng)度大、耐疲勞性好、并且具有強(qiáng)耐腐蝕及不易損壞性、方便實(shí)際施工以及對(duì)原構(gòu)件截面尺寸影響極小等特點(diǎn),從FRP出現(xiàn)到現(xiàn)在為止,世界上很多的專家、學(xué)者和工程師對(duì)FRP加固鋼筋混凝土結(jié)構(gòu)抗彎性能、抗剪性能和抗震性能等做了很大量的試驗(yàn)和研究,并且取得多項(xiàng)研究成果,也已有較多的實(shí)際應(yīng)用,在我國的房建工程中已被逐步運(yùn)用。但是因?yàn)榭辜艏庸袒炷两Y(jié)構(gòu)具有很多的影響因素,到現(xiàn)在為止對(duì)于抗剪加固鋼筋混凝土梁的有關(guān)文獻(xiàn)相對(duì)不多。并且現(xiàn)有的對(duì)于FRP加固混凝土梁的試驗(yàn)研究大多數(shù)針對(duì)側(cè)面粘貼、U型粘貼和全封閉粘貼,對(duì)于FRP板部分粘貼或傾斜粘貼的研究較少;并且,我國出的碳纖維片材加固技術(shù)規(guī)程中的公式也沒有區(qū)分條形粘貼和全貼、剝離和拉斷等因素,關(guān)于碳纖維抗剪加固混凝土結(jié)構(gòu)最終承載力的問題,只是把條行粘貼的碳纖維提供的抗剪承載力加上原梁的抗剪承載力,但是碳纖維和原來的鋼筋混凝土結(jié)構(gòu)并不是簡單的同時(shí)達(dá)到最大承載力,所以,研究碳纖維抗剪加固混凝土結(jié)構(gòu)承載力的主要問題是研究碳纖維的抗剪貢獻(xiàn)。還有,我國的技術(shù)規(guī)程只是籠統(tǒng)的給出了碳纖維板材的公式,沒有區(qū)分板和布的區(qū)別,對(duì)于抗剪加固混凝土結(jié)構(gòu)只是考慮了纖維方向與構(gòu)件縱向垂直,這造成抗剪計(jì)算的最終結(jié)果有些偏差,甚至有時(shí)候是不安全的。本文利用ABAQUS有限元軟件模擬加固了40根鋼筋混凝土梁并進(jìn)行靜力分析,研究分析幾種因素對(duì)承載力的影響。本文共有七種不同的粘貼方式,五組不同的原梁構(gòu)造,分別分析了混凝土強(qiáng)度、箍筋間距、剪跨比、FRP粘貼形式這四種情況對(duì)FRP抗剪加固鋼筋混凝土梁承載力的影響。本文主要的內(nèi)容和研究結(jié)果如下:1.根據(jù)參考文獻(xiàn),采用正確的混凝土、鋼筋和FRP的本構(gòu)關(guān)系,利用ABAQUS軟件建立FRP抗剪加固鋼筋混凝土梁的有限元模型,完成靜力加載分析,并與原文進(jìn)行比較,提出正確的有限元建模方法。2.改變模擬構(gòu)件的部分參數(shù),如混凝土強(qiáng)度、箍筋間距、剪跨比、FRP粘貼形式來研究分析各個(gè)因素對(duì)FRP抗剪加固鋼筋混凝土梁最終承載力的大小影響,以此驗(yàn)證各個(gè)參數(shù)對(duì)鋼筋混凝土梁開裂荷載、極限荷載、跨中位移和箍筋應(yīng)變的影響規(guī)律。3.基于所獲得的荷載-位移曲線,箍筋荷載-應(yīng)變曲線等數(shù)據(jù),通過分析得到影響FRP抗剪加固鋼筋混凝土梁的參數(shù),然后進(jìn)行對(duì)比分析,得到這幾種參數(shù)對(duì)抗剪加固的影響,在帶入我國碳纖維片材加固技術(shù)規(guī)程中的公式,與模擬數(shù)據(jù)對(duì)比驗(yàn)證,驗(yàn)證傾斜粘貼的優(yōu)勢(shì),并提出相應(yīng)系數(shù)。
[Abstract]:Fiber Reinforced Plastic, is called fiber reinforced composite in our country because of its many advantages: low density, high strength, good fatigue resistance, strong corrosion resistance and not easy to damage. From the appearance of FRP up to now, many experts, scholars and engineers in the world have studied the flexural behavior of reinforced concrete structures strengthened with FRP. A lot of experiments and researches have been done on the shear and seismic properties, and many research results have been obtained, which have been applied in many practical projects and have been used step by step in the housing construction projects in our country. However, due to the influence of many factors on shear strengthening of concrete structures, there are relatively few literatures on shear strengthening of reinforced concrete beams up to now. And most of the existing experimental studies on FRP strengthened concrete beams are aimed at side bonding and full closed bonding, but there are few researches on partial or oblique bonding of FRP plates. The formulas in the technical specification for CFRP reinforcement in our country also do not distinguish the factors such as strip paste and full sticking, stripping and breaking, etc., concerning the ultimate bearing capacity of concrete structures strengthened by CFRP shear. The shear capacity provided by the bonded carbon fiber is only added to the shear capacity of the original beam, but the carbon fiber and the original reinforced concrete structure do not reach the maximum bearing capacity at the same time, so, The main problem of studying the bearing capacity of CFRP reinforced concrete structure is to study the shear contribution of CFRP. In addition, the technical code of our country only gives the formula of carbon fiber sheet in general terms. There is no difference between sheet and cloth. For shear reinforced concrete structures, the direction of fiber is only considered to be perpendicular to the longitudinal direction of members. This results in some deviations and sometimes unsafe results in shear calculations. In this paper, ABAQUS finite element software is used to simulate the reinforcement of 40 reinforced concrete beams and static analysis is carried out to study the influence of several factors on the bearing capacity. In this paper, there are seven different bonding methods and five groups of different original beam structures. The effects of concrete strength, stirrups spacing and shear span ratio on the bearing capacity of reinforced concrete beams strengthened by FRP are analyzed. The main contents and results of this paper are as follows: 1. According to the reference, using the correct constitutive relation of concrete, steel bar and FRP, the finite element model of reinforced concrete beam strengthened by FRP shear is established by using ABAQUS software, and the static loading analysis is completed and compared with the original text. The correct finite element modeling method. By changing some parameters of simulated members, such as concrete strength, stirrups spacing, shear span ratio and FRP-bonded form, the influence of various factors on ultimate bearing capacity of reinforced concrete beams strengthened with FRP is studied. The effects of various parameters on cracking load, ultimate load, mid-span displacement and stirrups strain of reinforced concrete beams are verified. Based on the data of load-displacement curve and stirrups load-strain curve, the parameters of reinforced concrete beams strengthened with FRP shear are obtained through analysis, and then the effects of these parameters on shear strengthening are obtained. The formulas introduced into the technical specification of CFRP reinforcement in China are compared with the simulated data to verify the advantages of inclined paste and the corresponding coefficients are put forward.
【學(xué)位授予單位】：東北石油大學(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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