Recent studies have investigated the impact of minimum longitudinal reinforcement limits on the ductility of the plastic hinge region of reinforced concrete (RC) walls, resulting in revised minimum reinforcement limits in design standards. The objective of this research was to investigate the influence of the longitudinal reinforcement distribution or termination rules for the additional reinforcement at the end regions of the wall up the wall height on the response of taller lightly RC walls. A model utilizing a displacement-based fiber element was developed and validated against tested walls with a range of longitudinal reinforcement contents. Pushover analyses were then conducted on a 20-story wall prototype to investigate the sensitivity of key design parameters, including axial load pattern, curtailment heights of the longitudinal reinforcement in the plastic hinge region, reinforcement content at wall base, reinforcement strain-hardening ratio, and the length over which the reinforcement curtailment occurred. The results indicate that the current minimum reinforcement provisions in ACI 318–19 are insufficient to prevent reinforcement yielding outside the plastic hinge region at the wall base.

中文翻译：

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高层轻筋结构混凝土墙体钢筋削减研究

最近的研究调查了最小纵向钢筋限制对钢筋混凝土（RC）墙塑性铰链区域延展性的影响，从而修订了设计标准中的最小钢筋限制。本研究的目的是调查纵向钢筋分布或墙端区域的附加钢筋终止规则（沿墙高）对较高的轻型 RC 墙响应的影响。开发了一种利用基于位移的纤维元件的模型，并针对具有一系列纵向钢筋含量的测试墙进行了验证。然后对 20 层墙体原型进行 Pushover 分析，以研究关键设计参数的敏感性，包括轴向荷载模式、塑性铰区纵向钢筋的削减高度、墙基钢筋含量、钢筋应变硬化比、以及发生钢筋削减的长度。结果表明，ACI 318-19 中当前的最小配筋规定不足以防止墙基塑料铰链区域之外的配筋屈服。