發(fā)布時(shí)間：2018-01-15 14:20

  本文關(guān)鍵詞：FRP加固帶裂縫木梁彎曲性能研究　出處：《上海大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 纖維增強(qiáng)復(fù)合材料 矩形截面木梁/木柱 裂縫 加固 彎曲變形

【摘要】：木結(jié)構(gòu)是我國、日本及北美等國家的主要傳統(tǒng)建筑結(jié)構(gòu)形式之一，由于木材本身易開裂，現(xiàn)存木構(gòu)件中有相當(dāng)大的一部分具有裂紋，甚至是貫穿性裂縫，亟需加固維護(hù)。與傳統(tǒng)的木結(jié)構(gòu)加固方法相比，使用纖維增強(qiáng)聚合物復(fù)合材料（FRP）加固木結(jié)構(gòu)具有更多的優(yōu)勢，也具有更廣泛的應(yīng)用前景，值得進(jìn)一步深化研究。本文對(duì)具有縱向貫穿裂縫矩形截面木梁FRP布加固后的彎曲性能進(jìn)行了理論建模、解析求解和參數(shù)研究，得到了一些結(jié)果，主要工作如下： 1.對(duì)具有縱向貫穿裂縫的矩形截面木梁，采用四周粘貼FRP布的方式加固，考慮FRP布加固層拉伸與壓縮時(shí)的不同彈性模量，基于組合梁小撓度變形的假定下，首先建立了四周粘貼FRP布加固帶縱向貫穿裂縫矩形截面木梁彎曲變形的控制方程。指出當(dāng)FRP布剪切模量趨于無窮或零時(shí)，該控制方程分別退化為四周粘貼FRP布加固完整無裂縫木梁和疊木梁彎曲變形的控制方程。在此基礎(chǔ)上，研究了FRP布加固簡支木梁在均布荷載作用下的彎曲行為，給出了問題的解析解，考察了材料、幾何參數(shù)和加固方式等因素對(duì)加固木梁彎曲變形的影響。 2.基于前面FRP布加固帶縱向貫穿裂縫木梁彎曲變形的控制方程，研究了兩集中荷載作用下FRP布加固帶裂縫簡支木梁的彎曲變形，利用分段函數(shù)，，連續(xù)條件和邊界條件，得到加固木梁彎曲撓度的解析解。驗(yàn)證了解析解的可靠性和適用性，進(jìn)行了參數(shù)分析研究。 3.研究了四周粘貼FRP布加固帶縱向貫穿裂縫矩形截面簡支木柱在偏心壓力作用下的壓彎問題，建立了FRP布加固帶縱向貫穿裂縫木柱壓縮與彎曲組合變形的控制方程。研究了FRP加固簡支木柱在一端偏心力作用下的變形，得到了FRP加固木柱軸向位移及彎曲撓度的解析表達(dá)式，并考察了材料、幾何參數(shù)、加固方式和受壓荷載偏心距等對(duì)FRP加固簡支木柱彎曲變形的影響。 4.研究了四周粘貼FRP布加固完整無裂縫簡支木柱的偏心受壓彎曲，得到了問題的解析解，考察了FRP布的彈性模量、加固方式、加固厚度以及木柱長細(xì)比等因素對(duì)FRP布加固完整木柱撓度的影響。
[Abstract]:Wood structure is one of the main traditional building structures in China, Japan and North America. Due to the easy cracking of wood itself, a large part of the existing wood members have cracks, even penetrating cracks. Compared with the traditional method of strengthening wood structure, FRP-based fiber reinforced polymer composite (FRP) has more advantages and has a wider application prospect. It is worth further study. In this paper, the flexural behavior of rectangular beams reinforced by FRP sheets with longitudinal penetrating cracks is modeled, solved analytically and parameters studied, and some results are obtained. The main tasks are as follows: 1. The rectangular cross-section wooden beams with longitudinal cracks are strengthened with FRP sheets, and the different elastic moduli of the layers strengthened with FRP sheets are considered. Based on the assumption of small deflection deformation of composite beam. First, the governing equations of bending deformation of rectangular beams with longitudinal penetrating cracks strengthened with FRP sheets are established, and it is pointed out that when the shear modulus of FRP sheets tends to infinity or 00:00. The governing equations are reduced to the governing equations of bending and deformation of intact cracked wood beams and laminated beams strengthened with FRP sheets respectively. The bending behavior of simply supported timber beams strengthened with FRP sheets under uniform load is studied. The analytical solution is given. The effects of materials, geometric parameters and reinforcement methods on the bending deformation of the strengthened timber beams are investigated. 2. Based on the governing equation of the bending deformation of the longitudinal perforated beams strengthened with FRP sheets in front, the bending deformation of simply supported beams with cracks strengthened by FRP sheets under two concentrated loads is studied, and the piecewise function is used. The analytical solution of the bending deflection of the strengthened wood beam is obtained under the continuous condition and the boundary condition. The reliability and applicability of the analytical solution are verified and the parameter analysis is carried out. 3. The compression and bending of simply supported columns with longitudinal perforated rectangular section strengthened with FRP sheets under eccentric pressure are studied. The governing equations of the compression and bending combined deformation of the longitudinal perforated timber columns strengthened with FRP sheets are established. The deformation of simply supported columns strengthened with FRP under the action of eccentric force at one end is studied. The analytical expressions of axial displacement and bending deflection of FRP strengthened timber columns are obtained. The effects of materials, geometric parameters, reinforcement methods and eccentricity of compression load on the bending deformation of simply supported timber columns strengthened with FRP are investigated. 4. The eccentricity bending of intact simply supported columns without cracks strengthened with FRP sheets is studied, the analytical solution of the problems is obtained, and the elastic modulus and reinforcement mode of FRP sheets are investigated. The effect of strengthening thickness and the ratio of length to slenderness on the deflection of the whole column strengthened with FRP cloth.
【學(xué)位授予單位】：上海大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU366.2

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