深层CFFT梁抗剪强度预测

I. Ahmad, Zhenyu Zhu, A. Mirmiran, A. Fam
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引用次数: 11

摘要

摘要:尽管在使用纤维增强聚合物混凝土(FRP)管(CFFT)方面取得了重大的理论进展,但对其剪切性能的研究很少而且有限。目前的CFFT梁剪切分析方法依赖于伯努利梁理论,该理论利用了跨深度线性应变分布的基本假设。最近,有人建议使用修正压缩场理论来改进CFFT梁的剪切分析。然而,该方法不适用于波束的扰动区或d区,例如深CFFT波束。因此,本研究采用拉杆模型对深层CFFT梁的抗剪强度进行预测。对剪切-展深比为1的CFFT梁的试验结果进行了验证。然后进行了参数化研究,以评估CFFT梁的剪切临界。研究表明,只有当梁的抗剪跨度小于梁的深度时,梁的抗剪破坏才会发生。高强混凝土也能提高CFFT梁的承载力。然而,明智地选择混凝土强度和纤维结构与不同比例的抗剪和抗弯能力的管可以帮助优化材料的使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shear Strength Prediction of Deep CFFT Beams
Synopsis: Despite significant theoretical advances in the use of concrete-filled fiber reinforced polymer (FRP) tubes (CFFT), research on their shear behavior has been few and limited. Current method of shear analysis of CFFT beams relies on Bernoulli beam theory, which utilizes the basic assumption of linear strain distribution across the depth. Most recently, the use of modified compression field theory was suggested to improve the shear analysis of CFFT beams. The approach, however, is not applicable to the disturbed or D-regions of a beam, such as those in a deep CFFT beam. Therefore, this study adopted the strut-and-tie model to predict the shear strength of deep CFFT beams. The model is validated against test results for a CFFT beam with a shear-spanto-depth ratio of 1. A parametric study is then carried out to assess the shear criticality of CFFT beams. The study showed that shear failure would only be critical for beams with shear span less than their depth. High strength concrete was also found to improve capacity of CFFT beams. However, a judicious selection of concrete strength and fiber architecture with different proportions of shear and flexural capacities of the tube could help optimize the use of materials.
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