A new lateral confining method is proposed for reinforced concrete columns in this study. The new scheme incorporates additional lateral confinements that are placed outside conventional lateral reinforcements within cross section of a column. Stainless steel wires or glass fiber reinforced plastic (GFRP) rings have been employed as the additional confinement. A total of seven reinforced concrete column specimens have been tested to validate the proposed new scheme. Primary parameters in the test are vertical spacing and volumetric ratio of the additional confinements amongst others. Lateral hysteretic response shows that specimens with the newly proposed scheme exhibit no strength degradation up to 6% of drift ratio, the specimen without such scheme displays somewhat sudden degradation at 5% of drift ratio. Experimental results also indicate that displacement ductility and energy dissipation of specimens confined by the additional confinements are greater than those of specimen without such confinements. Margin of safety with reference to the code‐specified ductility is 1.6, 2.2, and 2.1 for specimen with no confinements, stainless steel wires, and GFRP rings, respectively. In addition, energy dissipation ability reveals that specimens with the confinements show up to 50% higher than the specimen without confinements. In all, experimental observation confirms that the present approach is promising to provide an additional confinement and ductility. It is thus expected that the suggested scheme can be applied to reinforced concrete columns and be particularly effective for those members with relatively large vertical spacing of conventional lateral reinforcements.

中文翻译：

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使用不锈钢或玻璃纤维增​​强塑料的钢筋混凝土柱的新约束方案

提出了一种新的钢筋混凝土柱侧向约束方法。新方案结合了额外的侧向约束，这些侧向约束被放置在柱子横截面内的常规侧向钢筋之外。不锈钢线或玻璃纤维增​​强塑料（GFRP）环已被用作额外的限制。总共测试了七个钢筋混凝土柱标本，以验证所提出的新方案。测试中的主要参数是其他隔离物的垂直间距和体积比。横向滞后响应表明，采用新提出的方案的试样在漂移比高达6％时不会出现强度退化，而没有这种方案的试样在漂移率为5％时会表现出某种程度的突然退化。实验结果还表明，受附加约束条件约束的试样的位移延展性和能量耗散要大于没有约束条件的试样的位移延展性和能量耗散。参照规范规定的延展性，无限制的试样，不锈钢丝和GFRP环的安全极限分别为1.6、2.2和2.1。另外，能量消散能力表明具有约束的样本比没有约束的样本高出50％。总之，实验观察证实，本方法有望提供额外的限制和延展性。