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-展示頁(yè)
2025-05-27 08:32本頁(yè)面
【正文】 ion 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 —moment of inertia of the members at the stage of longitudinal steel strands pretension； generated by prestressed CFRP sheets Under CFRP sheets prestress, the moment of inertia of prestressed concrete members should take the converted second moment of area at the strengthening stage. The displacement is calculated according to the following formula: cfecfcrM xMe d sB? ? ? （ 5） In which M cfe ——bending moment caused by CFRP sheets existing pretension at any section x； 3. Analysis of rigidity Rigidity B0 and B cr are decided by 0 I I cr . The paper is to derive the calculation method of prestressed CFRP strengthening concrete box girders’section 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
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