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(東華理工大學(xué)土木與建筑工程學(xué)院， 南昌 330013)
［摘要］為研究濕熱環(huán)境下CFRP布加固工字鋼梁的加固效果，采用有限元軟件ABAQUS進(jìn)行了變溫度場下未加固、一層、三層和五層CFRP布加固工字鋼梁的數(shù)值模擬，得到了工字鋼梁的荷載-溫度曲線和疲勞壽命-溫度曲線，建立了CFRP布加固工字鋼梁的疲勞壽命預(yù)測模型。結(jié)果表明，CFRP布加固工字鋼梁的承載力和疲勞性能受溫度的影響，一層、三層、五層CFRP布加固工字鋼梁的疲勞壽命增強(qiáng)比例最大分別為157%，266%，370%，極限荷載增強(qiáng)比例最大分別為2.31%，5.53%，8.41%。
［關(guān)鍵詞］變溫度場；碳纖維復(fù)合材料；工字鋼梁加固；疲勞壽命
中圖分類號：TU391 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)16-0093-04
Study on fatigue performance of CFRP cloth reinforced I-steel-beam under variable temperature field
YANG Wenrui, FENG Zhongmin, LI Huiying, YUAN Jiao
(School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013， China)
Abstract: In order to study the reinforcement effect of CFRP (carbon fiber reinforced polymer) cloth reinforced I-steel-beam under the humid and hot environment, the finite element software ABAQUS was used to carry out the numerical simulation of the unreinforced, one-layer, three-layer and five-layer CFRP cloth CFRP cloth reinforced I-steel-beam under variable temperature field. The load-temperature curve and fatigue life-temperature curve of the I-steel-beam were obtained, and the fatigue life prediction model of the CFRP cloth reinforced I-steel-beam was established. The results show that the bearing capacity and fatigue performance of CFRP cloth reinforced I-steel-beam are affected by temperature, and the fatigue life enhancement ratios of one-layer, three-layer and five-layer CFRP cloth reinforced I-steel-beam are 157%, 266%, 370% respectively, the ultimate load enhancement ratio is 2.31%, 5.53%,8.41% respectively.
Keywords:variable temperature field； carbon fiber reinforced polymer； I-steel-beam reinforcement； fatigue life
*國家自然科學(xué)基金（51178361），江西省自然科學(xué)基金（20181BAB216027），江西省教育廳科技計(jì)劃項(xiàng)目（GJJ170486），博士啟動(dòng)金（DHBK2017119），江西省交通運(yùn)輸廳科技項(xiàng)目（2015H0039）。
作者簡介：楊文瑞，博士，講師，碩士生導(dǎo)師，Email:wryang99@163.com。
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