researchondeflectionofstrengtheningconcretebeamwithprestressedcfrpsheets-外文文獻(xiàn)-wenkub.com
2025-05-06 12:38 本頁(yè)面
【正文】 ——the effective depth of the pressed flange of the ISection fb ——the effective width of the tensile flange of the ISection fh ——the effective depth of the tensile flange of the ISection Esα ——the ratio of the elastic modulus of the steel bar to that of the concrete Epα ——the ratio of the elastic modulus of the prestressed steel strands to that of the concrete Ecfα ——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 she ets 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 small impact on the rigidity. References [1] Chinese National Standards, “Concrete Structure Design SpecificationGB503672020,” Beijing：China Architecture amp。39。230))((121)2(121ffhbbxhbhbhI ?+?+= 3239。)()()1( xahAaxAppEpSEs??+??+ αα 2239。39。 deflection。Research on Defle ction of Strengthening Concrete B eam with Prestressed CFRP Sheets WANG Xiang yang, JI
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