The objective of this paper was to evaluate the strength and ductility of laterally confined concrete. To reach the purpose, the effects of the investigated parameters including concrete strength, the volumetric ratio, tensile strength, configurations of transverse reinforcements, as well as the longitudinal reinforcements ratio on the strength and the ductility of laterally confined concrete were analyzed. A three-dimension effective confinement coefficient of confined circular and rectangular columns was proposed to evaluate the effective confinement area of core concrete in both plane and elevation, and the strength and ductility enhancement factor prediction models of confined concrete were developed to evaluate the strength and ductility of confined concrete. The results showed that concrete strength, the volumetric ratio and configurations of transverse reinforcements, and the distribution of longitudinal reinforcements had obvious influence on the strength and ductility of confined concrete and only when lateral stress exceeded the yield strength of transverse reinforcements, transverse reinforcements had significant effects on the strength and ductility of confined concrete. Furthermore, the proposed strength enhancement factor and ductility enhancement factor models of confined concrete can be utilized to evaluate the strength and ductility of laterally confined concrete.

中文翻译：

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侧向约束混凝土的强度和延展性

本文的目的是评估侧向约束混凝土的强度和延展性。为达到此目的，分析了混凝土强度、体积比、抗拉强度、横向配筋配置以及纵向配筋率等参数对侧向约束混凝土强度和延性的影响。提出了约束圆柱和矩形柱三维有效约束系数来评价核心混凝土在平面和立面上的有效约束面积，并建立了约束混凝土的强度和延性增强因子预测模型来评价核心混凝土的强度和延性。的密闭混凝土。结果表明，混凝土强度、横向配筋的体积比、配筋、纵筋的分布对约束混凝土的强度和延性有明显的影响，只有当侧应力超过横向钢筋的屈服强度时，横向配筋才对混凝土的强度和延性产生显着影响。约束混凝土。此外，所提出的约束混凝土强度增强因子和延性增强因子模型可用于评估侧向约束混凝土的强度和延性。横向钢筋对约束混凝土的强度和延性有显着影响。此外，所提出的约束混凝土强度增强因子和延性增强因子模型可用于评估侧向约束混凝土的强度和延性。横向钢筋对约束混凝土的强度和延性有显着影响。此外，所提出的约束混凝土强度增强因子和延性增强因子模型可用于评估侧向约束混凝土的强度和延性。