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外文翻譯---預(yù)應(yīng)力碳纖維布加固鋼筋混凝土梁抗彎性能研究-wenkub.com

2025-05-07 08:32 本頁面
   

【正文】 [5]葉建樹,《結(jié)構(gòu)設(shè)計原理》,北京:中國交通出版社, 2020,5。 參考資料 [1]《中華人民共和國國家標準 ―混凝土結(jié)構(gòu)設(shè)計規(guī)范 GB50367 – 2020》,北京:中國建筑工業(yè)出版社, 2020。 4 結(jié)論 上述分析表明:預(yù)應(yīng)力碳纖維布對結(jié)構(gòu)變形的影響主要表現(xiàn)在于它能夠改變截面的剛度和引起構(gòu)件的位移。f—―I”字形截 面受壓翼緣板的有效寬度; f—― ”字形截面受壓翼緣板的有效高度; b f——― ”字形截面受拉翼緣板的有效寬度; h f——―I”字形截面受拉翼緣板的有效高度; s??—普通鋼筋彈性模量與混凝土彈性模量的比值; p—預(yù)應(yīng)力鋼絞線彈性模量與混凝土彈性模量的比值; cf—碳纖維布的彈性模量與混凝土彈性模量的比值。( ) ( 1) ( )222( 1) 39。 39。 6f f s sp p cff s sp p p p feIcr b x b b x h A h x A x aA h a x A x a A h x??? ? ?? ? ?? ? ? ?? ? ?? ? ? ? ? ? ?? ? ? ? ? ( ) 11 fh39。) 39。 Icr 的計算 裂縫截面對中心軸的折算偏心距由以下公式來進行計算。位移按照下列公式計算: ( 5) 其中:cefM—在任意截面 x由于現(xiàn)存的碳纖維布預(yù)應(yīng)力所產(chǎn)生的彎矩 3 剛度的分析 剛度0B和cr由0I和cr所決定。 0I—用碳纖維布加固混凝土后橫截面的二次轉(zhuǎn)換彎矩; cr—用碳纖維布加固混凝土后開裂截面的二次轉(zhuǎn)換彎矩。 B0= I0 ( ?) 在極限和開裂彎矩的作用下有以下公式: Bcr=EcIcr ( 2) 預(yù)應(yīng)力碳纖維布 對撓度的 的影響主要在于它能改變截面的剛性和引起構(gòu)件產(chǎn)生位移。 本文以當前廣泛使用的箱形梁橋為模型,推導(dǎo)了使用碳纖維加固后橋梁撓度的計算方法和并且對結(jié)構(gòu)加固后的力學(xué)性能做了理論上的分析 。 本文主要研究了采用預(yù)應(yīng)力碳纖維布加固對原混凝土結(jié) 構(gòu)的撓度和剛度的影響,并且推導(dǎo)了相關(guān)的理論公式。fb—the effective width of the pressed flange of the ISection ——the effective depth of the pressed flange of the ISection b f ——the effective width of the tensile flange of the ISection h f——the effective depth of the tensile flange of the ISection s??——the ratio of the elastic modulus of the steel bar to that of the concrete p——the ratio of the elastic modulus of the prestressed steel strands to that of the concrete cf? the ratio of the elastic modulus of the CFRP sheets to that of the concrete According to equations ( 6 ) and ( 7 ) , the reinforcement of CFRP sheets changes the rigidity of the section in a very limited way. Though CFRP sheets are of high strength, they are quite thin and of small area and a small section moment inertia. Therefore they generally have a small impact on the rigidity. This is why the strengthening of CFRP sheets does little in changing the rigidity of the structure in long span bridges. 4. Conclusions The analysis above shows that: The influences of prestressed CFRP sheets on deflection mainly lie in altering the rigidity of the section and causing displacement in the members. For long span bridges, altering the thickness of CFRP sheets can not dramatically ameliorate the deflection of midspan in bridges. This can be proved by the way of FEM: though CFRP sheets are of high strength, they are quite thin and of small area and a small section moment of inertia. Therefore they generally have a smal
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