土木工程外文文献翻译--决定用frp筋制作的预应力混凝土构件的长期行为的方法-建筑结构.doc

附录A科技文献翻译原文ConstructionandBuildingMaterialsVolume21,Issue5,May2007,Pages1052-1060Anapproachtodeterminelong--termprestresslossandthelong-termchangeinconcretestressesincontinuousprestressedconcretememberswitheithercarbonfiberreinforcedpolymer(CFRP)oraramidfiberreinforcedpolymer(AFRP),-parablegirdersprestressedwithsteeltendons,dependingonthetypeofFRPtendonsandtheinitialstressprofileofthecross-:Creep;FRP;Long-term;Prestressloss;Prestressedconcrete;Relaxation;ShrinkageNomenclatureAareaofcrosssectiondverticaldistancemeasuredfromtopfiberofcrosssectionEmodulusofelasticityage-adjustedelasticitymodulusofconcretefpuultimatestrengthofprestressingtendonhtotalthicknessofconcretecrosssectionIsecondmomentofareaOcentroidofage-adjustedtransformedsectiontfinaltime(endofservicelifeofconcretemember)t0concreteageatprestressingycoordinateofanyfibermeasureddownwardfromOχagingcoefficientχrreducedrelaxationcoefficientαratioofmodulusofelasticityofFRPorsteeltothatofconcreteΔεc(t,t0)changeinconcretestrainbetweentimet0andtΔεOchangeinaxialstrainatthecentroidofage-adjustedtransformedsectionOΔσc(t,t0)stressappliedgraduallyfromtimet0toitsfullamountattimetΔσprintrinsicrelaxationreducedrelaxationΔσptotallong-termprestresslossΔψchangeincurvatureεcsshrinkagestrainofconcretebetweent0andtεc(t0)instantaneousstrainattimet0(t, t0)creepcoefficientbetweent0andtσc(t0)