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对7根自行研制的碳纤维-棱柱体预应力混凝土复合筋(CFRP-PCPs复合筋)混凝土梁进行了关于挠度的试验研究。对比发现:CFRP-PCPs复合筋混凝土梁在各受力阶段的挠度均较普通预应力CFRP筋混凝土梁小;CFRP-PCPs复合筋混凝土梁的挠度与CFRP的张拉控制应力及复合筋的截面面积有关,随着复合筋预应力和面积的增大,构件的挠度有一定程度的减小。在考虑CFRP-PCPs复合筋等效原理的基础上,对我国现行《混凝土结构设计规范》中适用于预应力钢筋混凝土梁的短期刚度计算公式进行修正,提出了适合新型CFRP-PCPs混凝土梁的挠度建议计算公式,并应用建议公式对其中含CFRP-PCPs复合筋的5根试验梁的挠度进行计算。将计算值与试验值对比,结果吻合良好。
Seven kinds of self-developed carbon fiber-prism prestressed concrete composite bars (CFRP-PCPs composite tendons) were tested on the deflection. It is found that the deflection of CFRP-PCPs composite reinforced concrete beams is smaller than that of ordinary prestressed CFRP reinforced concrete beams. The deflection of CFRP-PCPs composite bars and the tension control stress of CFRP and the cross-sectional area of composite bars With the increase of the prestress and the area of the composite reinforcement, the deflection of the member is reduced to a certain extent. Based on the equivalence principle of CFRP-PCPs composite bars, the short-term stiffness calculation formula applied to prestressed RC beams in China’s current “Code for Design of Concrete Structures” was revised and the deflection suitable for the new CFRP-PCPs concrete beams The calculation formula is suggested and the deflection of five test beams containing CFRP-PCPs composite bars is calculated by the proposed formula. Comparing the calculated value with the experimental value, the result is in good agreement.