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首页> 外文期刊>Mechanics of composite materials >Stability analysis of CFRP-wrapped concrete columns strengthened with external longitudinal CFRP sheets
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Stability analysis of CFRP-wrapped concrete columns strengthened with external longitudinal CFRP sheets

机译：外部纵向CFRP板加固CFRP包裹混凝土柱的稳定性分析

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摘要

The external confinement by CFRP wrappings is a very efficient method to increase the load-carrying capacity of round concrete columns. Nevertheless, the serviceability of such columns under loads exceeding the strength of unconfined concrete is limited by different factors. One of them is the reduced stability of the columns due to the significantly reduced tangent elastic modulus inactive loading. To increase the critical load of buckling instability of concrete columns, an additional longitudinal composite reinforcement can be used. In this paper, the stability and strength of concrete columns confined by circumferential wrappings and strengthened with a longitudinal external CFRP reinforcement are studied. Plain and confined columns of length 300 and 1500 mm were tested. Theoretical predictions show that the additional longitudinal reinforcement is efficient in improving the stability of confined columns in the region of moderate slenderness. The prediction for the ultimate strength and stability of the columns coincides rather well with experimental results.
机译：通过CFRP包裹进行外部约束是增加圆形混凝土柱承载能力的非常有效的方法。然而，这种柱在超过无限制混凝土强度的载荷下的可使用性受到不同因素的限制。其中之一是由于切线弹性模量非活动载荷的显着降低，导致柱的稳定性降低。为了增加混凝土柱屈曲不稳定性的临界载荷，可以使用附加的纵向复合材料钢筋。本文研究了用周向包裹层约束并用纵向外部CFRP加固的混凝土柱的稳定性和强度。测试了长度为300和1500 mm的普通柱和约束柱。理论预测表明，附加的纵向钢筋有效地改善了中等细长区域内承压柱的稳定性。柱的极限强度和稳定性的预测与实验结果非常吻合。

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