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(同濟(jì)大學(xué)建筑工程系  上海 200092)

［提要］  與預(yù)應(yīng)力鋼筋相比，F(xiàn)RP筋的彈性模量較低、粘結(jié)性能稍差，因此有粘結(jié)預(yù)應(yīng)力FRP筋混凝土梁的撓度比相應(yīng)的預(yù)應(yīng)力鋼筋混凝土梁的大。在考慮預(yù)應(yīng)力FRP筋等效的基礎(chǔ)上，對我國現(xiàn)行《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》中適用于普通預(yù)應(yīng)力鋼筋混凝土梁短期剛度的計(jì)算公式進(jìn)行了修正。應(yīng)用該修正公式和ACI 4404R—04規(guī)范中的計(jì)算公式對國內(nèi)外31根有粘結(jié)預(yù)應(yīng)力FRP筋混凝土梁試件與6根參數(shù)分析試件的撓度進(jìn)行了計(jì)算。對比表明，按修正公式計(jì)算的撓度值與試驗(yàn)結(jié)果和參數(shù)分析結(jié)果吻合更好。

［關(guān)鍵詞］  有粘結(jié)預(yù)應(yīng)力FRP筋  混凝土梁  撓度  計(jì)算方法

Calculation Methods for Deflections of Concrete Beams Prestressed with Bonded FRP Tendons/Authors:Wang Xiaohui, Xue Weichen, Tan Yuan(Tongji University, Shanghai 200092, China)

Abstract:Compared with the prestressing steel bars, FRP tendons exhibit the lower elastic modulus and worse bond behaviors between concrete. So the deflections of concrete beams prestressed with bonded FRP tendons are expected to be larger than those of the steel bars cases. The calculation methods of short-term stiffness of flexural concrete members reinforced with steel bars in current Chinese design code for concrete structures are modified taking account of the equivalent of FRP tendons. The deflections of existing thirty-one specimens and six parametric specimens are calculated based on the modified formulas and the correlative provisions proposed in ACI 440.4R.04 codes. Comparisons show that the calculated values given by the modified formulas agree well with the experimental results.

Keywords:bonded FRP tendon; concrete beam; deflection; calculation method

交通部西部交通建設(shè)科技項(xiàng)目（200631882244）；國家“十一五”863計(jì)劃課題（2006AA11Z103）資助。