【摘要】：FRP材料由于具有質(zhì)量輕、加固強度高、加固效率好等優(yōu)點被廣泛的應用到結(jié)構(gòu)加固中去,國內(nèi)外許多學者對FRP加固進行了研究,從FRP加固構(gòu)件的受力機理、錨固措施到影響因素等等,包括的范圍很廣,但是對FRP加固箱梁后的剛度變化情況很少有學者進行研究。箱梁截面的抗彎剛度在控制大跨徑橋梁的撓度中占有越來越重的作用,對FRP加固箱梁的剛度在正常使用階段是否能夠正常使用,對箱梁能否正常運營起著決定性的因素。本文對國內(nèi)外FRP加固鋼筋混凝土剛度的基礎上,結(jié)合國家“973計劃”項目《應用FRP實現(xiàn)重大工程結(jié)構(gòu)高性能與長壽命的基礎研究》(2012CB026205),對8根碳纖維布加固箱梁進行數(shù)值模擬分析,并且在研究的基礎之上對FRP加固箱梁在正常使用階段的剛度公式進行推導和驗證。本文研究的主要內(nèi)容如下： 1)國內(nèi)外關(guān)于FRP加固鋼筋混凝土梁的理論和試驗研究方面進行了總結(jié),同時對FRP加固鋼筋混凝土梁的剛度公式進行概括分析,根據(jù)他們公式的推導邊界條件、假設、簡化,進而分析FRP加固鋼筋混凝土梁的剛度公式的優(yōu)點和不足。 2)采用ANSYS有限元軟件對FRP加固箱梁進行數(shù)值模擬分析,根據(jù)數(shù)值模擬分析的結(jié)果對FRP加固箱梁的受力特點進行分析；同時分析FRP加固箱梁后,箱梁的剛度變化情況,并且通過和試驗箱梁的結(jié)果對比,得出本文采用的數(shù)值模擬有一定的精度。 3)對FRP加固箱梁剛度的影響因素進行分析,通過比較分析確定影響FRP加固箱梁剛度的主要影響因素,為推導FRP加固箱梁的剛度公式做準備；本文給出了FRP加固箱梁在不同情況下的剛度公式,并采用搜集到的試驗數(shù)據(jù)對推導剛度公式進行驗證,得出了本文的剛度公式具有一定的精度能夠為工程加固提供指導。
[Abstract]:FRP materials have been widely used in structural strengthening because of their advantages of light weight, high strength and good efficiency. Many scholars at home and abroad have studied the strengthening of FRP, which is based on the mechanical mechanism of FRP strengthened members. The anchoring measures include a wide range of factors, but few scholars have studied the stiffness change of box girder strengthened by FRP. The flexural stiffness of box girder section plays a more and more important role in controlling the deflection of long-span bridge. It plays a decisive role in whether the stiffness of box girder strengthened by FRP can be used normally in the normal service stage and whether the box girder can operate normally. On the basis of strengthening reinforced concrete stiffness of FRP at home and abroad and combining with the national "973 Program" project "basic Research on the Application of FRP to realize High performance and long Life of Major Engineering structures" (2012CB026205), the numerical simulation and analysis of 8 CFRP strengthened box girders are carried out in this paper. On the basis of the research, the stiffness formula of FRP strengthened box girder in normal service stage is deduced and verified. The main contents of this paper are as follows: 1) the theoretical and experimental research on reinforced concrete beams strengthened by FRP is summarized, and the stiffness formula of reinforced concrete beams strengthened by FRP is analyzed. According to the derivation of boundary conditions, supposition and simplification of their formulas, the advantages and disadvantages of the stiffness formula of reinforced concrete beams strengthened by FRP are analyzed. 2) numerical simulation of box girder strengthened by FRP is carried out by using ANSYS finite element software. According to the results of numerical simulation analysis, the mechanical characteristics of box girder strengthened by FRP are analyzed, and the stiffness of box girder strengthened by FRP is analyzed, and the results are compared with those of experimental box girder. It is concluded that the numerical simulation adopted in this paper has a certain accuracy. 3) the factors affecting the stiffness of FRP strengthened box girder are analyzed, and the main factors affecting the stiffness of FRP strengthened box girder are determined through comparative analysis. In order to deduce the stiffness formula of FRP strengthened box girder, this paper gives the stiffness formula of FRP strengthened box girder under different conditions, and verifies the derived stiffness formula by the collected experimental data. It is concluded that the stiffness formula of this paper has certain precision and can provide guidance for engineering reinforcement.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U445.72

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