researchondeflectionofstrengtheningconcretebeamwithprestressedcfrpsheets-外文文獻(xiàn)-在線瀏覽
2025-07-30 12:38本頁(yè)面
【正文】 paper researched the affection about the deflection and rigidity of concrete structures after strengthening with prestressed CFRP sheets, and derived related theoretic formulas. It is shown that the pr estressed CFRP sheets can not dramatically change the deflection of the structures because the prestressed CFRP sheets are generally thin with small moment of inertia for the structural sections. Keywords: prestressed。 strengthening。 deflection。t fully exert with general strengthening method. Prestressed CFRP sheets (as shown in ) can improve the mechanical behaviors of the members in usage and bear great significance in promoting the researches of this technology and for the engineering practices. Figure1 Carbon fiber reinforced plastic sheets Taking the currently widely used box girder bridges as a model, this paper derives the method of calculating the deflection of bridges strengthened with prestressed CFRP sheets and theoretically analyzes the mechanical behaviors of the structures after the strengthening. 2. Calculation of the deflection . Calculation principle When strengthening concrete beams with prestressed CFRP sheets the ponents are monly under the action of loads。39。)())((3131xhAhxbbxbIsEsfffcr?+???= α 2239。)()()1( xahAaxAppEpSEs??+??+ αα 2239。)()()1( xhAaxAfeEcfppEp?+??+ αα （ 6） Figure 2 The calculation chart of I section at the cracking stage . Calculation of 0I 0I is 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. 339。230))((121)2(121ffhbbxhbhbhI ?+?+= 3239。39。39。39?！猼he effective depth of the pres
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