(东华理工大学土木与建筑工程学院， 南昌 330013)

［摘要］为研究湿热环境下CFRP布加固工字钢梁的加固效果，采用有限元软件ABAQUS进行了变温度场下未加固、一层、三层和五层CFRP布加固工字钢梁的数值模拟，得到了工字钢梁的荷载-温度曲线和疲劳寿命-温度曲线，建立了CFRP布加固工字钢梁的疲劳寿命预测模型。结果表明，CFRP布加固工字钢梁的承载力和疲劳性能受温度的影响，一层、三层、五层CFRP布加固工字钢梁的疲劳寿命增强比例最大分别为157%，266%，370%，极限荷载增强比例最大分别为2.31%，5.53%，8.41%。 

［关键词］变温度场；碳纤维复合材料；工字钢梁加固；疲劳寿命 

中图分类号：TU391 文献标识码：A文章编号：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

*国家自然科学基金（51178361），江西省自然科学基金（20181BAB216027），江西省教育厅科技计划项目（GJJ170486），博士启动金（DHBK2017119），江西省交通运输厅科技项目（2015H0039）。

 作者简介：杨文瑞，博士，讲师，硕士生导师，Email:wryang99@163.com。