Effect of Slenderness Ratio on Fatigue Life of CFRP Strengthened Steel I-Beam

International Journal of Electrical Engineering and Applied Sciences Pub Date : 2020-10-02 DOI:10.24107/ijeas.772707

M. Islam, Md. Abdul Hasib

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Abstract

Carbon fiber reinforced polymers (CFRP) to repair and strengthen the steel I-beam has been increasingly used since last decade. CFRP composites bonded to steel members offer many advantages over steel plate bonding including excellent corrosion resistance, high stiffness and high strength to weight ratios etc. This study numerically investigates the fatigue performance of CFRP strengthened steel I-beam. One non-strengthened control beam and several strengthened beams using steel plates and CFRP strips were investigated primarily. The effect of slenderness ratios of web on fatigue behavior of CFRP strengthened steel I-beam is investigated. The beams were simulated in full three-dimension and fatigue life was investigated by using general-purpose ﬁnite element program, ANSYS. Simply supported beam subjected to two loads on compression flange is analyzed to show the effect of CFRP and slenderness ratios on fatigue behavior of steel I beam. The results show, that the life cycle of a CFRP strengthened beam before failure is higher than that of bare beam. It is also observed that beams with higher slenderness ratios (fixed thickness of the web) give better fatigue performance.

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长细比对CFRP加固工字钢疲劳寿命的影响

近十年来，碳纤维增强聚合物(CFRP)用于工字钢的修复和加固得到了越来越多的应用。CFRP复合材料粘接钢构件具有许多优于钢板粘接的优点，包括优异的耐腐蚀性，高刚度和高强度重量比等。本文对CFRP加固工字钢的疲劳性能进行了数值研究。对一根未加固的控制梁和几根采用钢板加碳纤维布加固的梁进行了初步研究。研究了腹板长细比对CFRP加固工字钢疲劳性能的影响。采用通用有限元软件ANSYS对梁进行了全三维模拟，并对其疲劳寿命进行了研究。分析了简支梁在压缩翼缘的双重荷载作用下，碳纤维布和长细比对工字钢梁疲劳性能的影响。结果表明:CFRP加固梁破坏前的寿命周期高于裸梁;高长细比(腹板固定厚度)的梁具有较好的疲劳性能。

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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International Journal of Electrical Engineering and Applied Sciences

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12 weeks