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钢筋混凝土中空桥墩承受了较大弯矩和剪力,为减轻自重,提高基础的承载力,进行强度-质量比及强度-刚度比的结构优化,进而在高地震作用下以及边界要求抬高基础时,减少柱的自重,降低地震响应。近十年来,对采用纤维增强复合材料加固的实心柱进行了广泛研究,然而缺乏对纤维增强复合材料加固空心柱的研究。基于脆性破坏机制下的强度和延性,所提出的约束模型和计算公式能够预测纤维增强复合材料加固空心柱的基本性能,即混凝土保护层的破裂和钢筋屈曲(空心构件的一般破坏模式)。根据混凝土以及约束外壳的应力-应变关系,可以对各级荷载下多轴应力状态以及混凝土或外裹FRP的破坏形式进行评估。根据曲率和延性,所提模型对构件变形进行了评估。研究表明:理论分析结果与试验结果吻合较好。
In order to reduce the self-weight and improve the bearing capacity of the foundation, the structural optimization of the strength-mass ratio and the strength-stiffness ratio of the reinforced concrete hollow piers is subjected to large bending moment and shearing force, and then the foundation is required to be lifted under the action of high earthquakes and the boundary Reduce the column’s weight and reduce the seismic response. In the past decade, solid columns reinforced with fiber reinforced composites have been studied extensively, however, there is a lack of research on reinforced hollow columns reinforced with fiber reinforced composites. Based on the strength and ductility of the brittle failure mechanism, the proposed constraint model and calculation formula can predict the basic properties of reinforced hollow fiber reinforced plastic composite columns, namely, the cracking of concrete cover and the buckling of reinforced bar (general failure mode of hollow members). According to the stress-strain relationship of concrete and confinement shell, the multi-axial stress state under various loads and the damage form of concrete or wrapped FRP can be evaluated. Based on the curvature and ductility, the proposed model evaluates the component deformation. The results show that the theoretical analysis is in good agreement with the experimental results.