持续荷载对FRP内加固混凝土梁受弯裂缝宽度的影响

SP-264: Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement Pub Date : 2009-10-01 DOI:10.14359/51663258

S. Gross, J. Yost, D. J. Stefanski

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引用次数: 3

摘要

本文将讨论一项实验研究，该研究是为了评估纤维增强聚合物(FRP)增强混凝土由于持续加载而随时间增加的裂缝宽度。12根梁(8根GFRP, 2根CFRP和2根钢增强)在恒定的持续服务荷载下保持了近3年。在试验期间，对每根梁上的三个弯曲裂缝进行了监测。在研究中观察到的抗弯裂缝宽度的增加在frp增强的试件中比在钢增强的试件中更大。平均而言，frp钢筋混凝土试件的弯曲裂缝宽度在持续加载一年内增加一倍。基于对现有ACI 440(2006)裂缝控制程序的修改，提出了一种简单的设计方法来解释观察到的裂缝宽度随时间的增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effect of Sustained Loads on Flexural Crack Width in Concrete Beams Reinforced with Internal FRP Reinforcement

This paper will discuss an experimental study that was conducted to evaluate the increase in crack width occurring over time in fiber reinforced polymer (FRP) reinforced concrete as a result of sustained loading. Twelve beams (eight GFRP, two CFRP, and two steel-reinforced) were maintained under a constant sustained service load for nearly three years. Three flexural cracks were monitored on each beam over the duration of the test. The observed increase in flexural crack widths over the study was greater in the FRP-reinforced specimens than in the steel-reinforced specimens. On average, flexural crack widths in FRP-reinforced concrete specimens were observed to double over one year of sustained loading. A simple design approach, based on modification to the existing ACI 440 (2006) crack control procedure, is proposed to account for this observed increase in crack widths with time.

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SP-264: Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement

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