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
2023-05-19 08:32:02 本頁面
【正文】 l impact on the rigidity. 7 References [1] Chinese National Standards, “Concrete Structure Design SpecificationGB503672020,” Beijing： China Architecture amp。( ) )12 2 12 2 122 2 2 2( ) ( 1) ( 0 ) ( 1) 39。 13 2 3 2 3bh bh ) 39。 39。 the reinforced bar have already been under some tensile strain and the concrete in the tensile area may have already had cracks. The deflection of the structures in usage should be calculated separately. Taking Btype prestressed concrete member as a reference, according to Reference [3], 3 the bending rigidity is calculated segment by segment according to the moment of the bination for shortterm action effects under the action of cracking moment cr M ： B0= I0 （ ?） under the action of moment MsMcr: Bcr=EcIcr （ 2） The impacts of prestressed CFRP sheets on deflection mainly lie in altering the rigidity of the section and causing displacement in the members. The deflection of prestressed concrete ponents is posed of two parts： the displacement generated by eccentric pretension and deflection generated by external load（ permanent load and live load） .For prestressed concrete members of prestressed CFRP sheets, the displacement generated by CFRP sheets prestress should be considered. The deflection of prestressed CFRP sheets mainly includes the following four parts: 1) Deflection under the action of permanent load 2) Displacement generated by prestressed steel bars 3) Deflection under the action of live load 4) Displacement generated by prestressed CFRP sheets Deflection under the permanent and live load cr sMcr()MMW M dsBo Bcr??? （ 3） In which: M p —bending moment caused by the action of permanent load and live load at any section x； M x —bending moment at any section at virtual state x； I0 —converted second moment of cross section after the strengthening of CFRP sheets； I cr — converted second moment of cracking section after the strengthening of CFRP sheets； . Displacement generated by the prestressed steel 4 Under the prestress of steel strands, the moment of inertia of prestressed concrete members should adopt that of the pretension stage. The displacement is calculated according to the following formula: XpeM M pe dsEI? ?? （ 4） In which， M pe — bending moment caused by existing pretension of steel strands at any section x； I n —mo
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