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FRP在结构补强方面已经得到了广泛的应用,有关FRP约束混凝土于圆形柱轴心抗压强度计算模型相对较为成熟。以FRP约束混凝土圆形柱应力模型的基础上,针对方柱、矩形柱截面与圆形截面的不同,对FRP约束矩形截面混凝土柱的轴心受压性能进行过程分析,基于截面面积和惯性矩相等的换算原则,提出了矩形截面转换为圆形柱的等效直径计算公式,引入了截面影响系数对极限强度进行了修正,构建了FRP约束钢筋混凝土矩形柱的极限强度模型,并应用已有的试验数据对模型的有效性和可行性进行检验,结果表明,模型计算结果与试验数据具有较好的吻合度和一致性,能够反映FRP约束混凝土矩形柱的真实特性,研究成果可作为工程实践的参考依据。
FRP has been widely used in structural reinforcement. The calculation model of compressive strength of FRP-confined concrete at the center of circular column is relatively mature. Based on the FRP-constrained concrete circular column stress model, the axial compressive behavior of FRP-confined rectangular cross-section concrete columns is analyzed based on the difference of square columns, rectangular columns and circular sections. Based on the cross-sectional area and moment of inertia Equivalent conversion principle, the equivalent diameter formula of the rectangular column converted to a circular column is proposed, the ultimate strength is modified by introducing the cross-sectional influence coefficient, and the ultimate strength model of FRP-constrained reinforced concrete rectangular column is established. The experimental data verify the validity and feasibility of the model. The results show that the calculated results are in good agreement with the experimental data, which can reflect the real properties of FRP-confined concrete rectangular columns. The research results can be used as engineering practice The reference basis.