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首页> 外文期刊>International Journal of Concrete Structures and Materials >Ductility Design of Reinforced Very-High Strength Concrete Columns (100–150?MPa) Using Curvature and Energy-Based Ductility Indices
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Ductility Design of Reinforced Very-High Strength Concrete Columns (100–150?MPa) Using Curvature and Energy-Based Ductility Indices

机译：使用曲率和基于能量的延性指标设计超高强度钢筋混凝土柱（100-150？MPa）的延性设计

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The paper aims to develop theoretical expressions for the ductility design of very-high strength concrete (VHSC) (>?100?MPa) columns using curvature and a new flexural energy-based ductility approach. Eventually, the study aims to evaluates the feasibility of VHSC columns for different ductility classes, considering the limitation of providing a higher volume of transverse reinforcement due to possible steel congestion in the construction phase. An analytical program based on the experimental stress–strain relationship of confined VHSC, which is validated using experimental programs on VHSC columns, is used to evaluate the ductility of VHSC columns for different parameters such as axial load ratio, confinement pressure, longitudinal steel ratio, yield strength of transverse steel, cover area and compressive strength of concrete. The theoretical curvature ductility and flexural rotation-based energy ductility of 3200 rectangular columns were evaluated using the analytical program. Using curvature ductility and the new flexural rotation-based energy ductility for different parameters, a regression analysis is carried out to develop expressions for the ductility design of VHSC columns up to 150?MPa. Using the new definition of energy-based ductility, a new expression is developed for limited ductility design of VHSC; and it is concluded that the new approach reduces the required amount of steel confinement due to an increase in the energy ductility of VHSC at higher axial load ratios and higher strengths. The studies show that reinforced VHSC can be used for structures with nominal ductility demands.
机译：本文旨在利用曲率和基于挠曲能量的新型延性方法，为超高强度混凝土（VHSC）（>？100？MPa）柱的延性设计开发理论表达式。最终，该研究旨在评估VHSC柱适用于不同延性等级的可行性，考虑到由于施工阶段可能出现的钢拥挤而无法提供更大体积的横向钢筋的局限性。一个基于密闭VHSC的实验应力-应变关系的分析程序，已使用VHSC柱上的实验程序进行了验证，用于评估VHSC柱在不同参数（例如轴向载荷比，围压，纵向钢比，横向钢筋的屈服强度，覆盖面积和混凝土的抗压强度。使用分析程序评估了3200个矩形柱的理论曲率延性和基于弯曲旋转的能量延性。利用曲率延性和新的基于弯曲旋转的能量延展性针对不同的参数，进行了回归分析，以开发高达150？MPa的VHSC柱延性设计的表达式。使用基于能量的延展性的新定义，为VHSC的有限延展性设计开发了新的表达式;得出的结论是，由于在较高的轴向载荷比和较高的强度下VHSC的能量延展性提高，因此新方法减少了所需的钢约束量。研究表明，增强型VHSC可用于具有标称延性要求的结构。

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