外文翻译---预应力碳纤维布加固钢筋混凝土梁抗弯性能研究(编辑修改稿)

外文翻译---预应力碳纤维布加固钢筋混凝土梁抗弯性能研究(编辑修改稿)内容摘要：

n I0 and I cr under the premise that the depth of the tensile area is covered by the web (as shown in ). According to Reference [5], the members work with cracks. At the tensile area the concrete fails and transforms the tension on it to the longitudinal reinforcement which at this stage does not yield and the pressive stress of the concrete takes the shape of triangle. With the CFRP sheets, the sectional area of the steel bar and CFRP sheets should be converted into the concrete sectional area which is located at the gravity center of the steel bar and the CFRP sheets separately. 5 Calculation of Icr The moment of inertia I cr of the converted section of cracking section for central axis is: . Calculation of 0I 0I i s calculated by the section posed of the cross section area of the concrete and the converted area of plain reinforced bars, prestressed steel strands and prestressed CFRP sheets. In which, X—the depth of pression x can be calculated by the static balancing of the tensile area, the pression area and the neutral axis. b—the width of the web of the ISection hthe depth of the web of the ISection 33 221)2 2 21)( 0 ) ( ( )( ) ( ( ) ( )1139。 ( 39。 )( 39。 ) 39。 39。 3339。 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                    （ ）0 1 h 1 39。 13 2 3 2 3bh bh ) 39。 39。 ) 39。 39。 ( ) )12 2 12 2 122 2 2 2( ) ( 1) ( 0 ) ( 1) 39。 ( ) ( 1) ( )222( 1) 39。 ( 0 39。 ) ( 1) ( )hfI x f hf f hf x f hfhff hf h x s As h x s As x a p Ap h ap xp Ap h ap cf Afe h x                            （ (b b)（ (b b) (bb)（(bb) 7 （ ） 6 39。 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 stre。