极地低温下CFRP筋与混凝土黏结性能数值分析  

Numerical analysis on bonding performance between CFRP bar and concrete at polar low temperatures

作　　者：谢剑[1,2] 王雪寒 刘洋[1,3] XIE Jian;WANG Xuehan;LIU Yang(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety(Tianjin University),Ministry of Education,Tianjin 300350,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300350 [3]中国铁路设计集团有限公司,天津300308

出　　处：《哈尔滨工业大学学报》2024年第10期1-13,共13页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51978459,52278201)。

摘　　要：为进一步了解极地低温下碳纤维增强复合材料(CFRP)筋与混凝土的黏结性能,在现有试验的基础上,采用ABAQUS软件建立考虑CFRP筋表面特征的数值模型,分析64种工况,研究低温下CFRP筋直径、肋高、肋宽与混凝土保护层厚度等参数对黏结性能的影响。结果表明:考虑CFRP筋表面特征的数值模型可以较好地表征CFRP筋与混凝土之间的应力传递,能够反映低温下CFRP筋与混凝土的损伤情况与黏结破坏机制;低温可显著提高CFRP筋-混凝土的黏结强度;在低温下,随着CFRP筋直径的增加,CFRP筋与混凝土的黏结强度降低,同时弱化了低温对黏结强度的增强效应;随着CFRP筋肋高的增加,CFRP筋-混凝土的低温黏结强度呈现先提高后降低的趋势,肋高为筋材直径8%时黏结强度达到最大值;CFRP筋肋宽的变化主要影响黏结滑移曲线的形状;相比常温试件,在低温下试件发生拔出破坏时的混凝土保护层厚度更大。In order to further study the bonding performance of carbon fiber reinforced polymer(CFRP) bar and concrete at polar low temperatures,a numerical model considering the CFRP bar surface characteristics was proposed utilizing ABAQUS.A total of 64 conditions were simulated in this study,to analyze the effect of CFRP bar diameter,rib height,rib width and concrete cover thickness on bonding on the bonding performance under low temperature conditions.The results showed that the numerical model considering the surface characteristics of CFRP bar can effectively reflect the stress transfer between CFRP bar and concrete,reflecting the damage and bonding failure mechanisms between CFRP bar and concrete at low temperatures.Low temperature significantly enhances the bonding strength between CFRP bar and concrete.At low temperatures,as the diameter of CFRP bar increases,the bonding strength between CFRP bar and concrete decreases,weakening the enhanced effect of low temperature on bonding strength.With an increase in rib height of CFRP bar,the low temperature bonding strength initially increases and then decreases,reaching the maximum value when the rib height is 8% of the reinforcement diameter.The variation in rib width of CFRP reinforcement mainly affects the shape of the bonding slip curve.Compared to specimens at room temperature,specimens at low temperature exhibit a thicker concrete cover when pull-out failure occurs.

关 键 词：碳纤维增强复合筋 极地低温 混凝土 黏结性能 数值模拟 

分 类 号：TU398[建筑科学—结构工程]