碳纤维织物增强水泥基复合材料拉拔过程力阻响应和等效分层破坏模型  

Piezoresistive response of carbon fibric reinforced cementitious matrix during pull-out test and the establishment of equivalent delamination failure model

作　　者：陶冶王之 张大伟[1] 陈冠浩 TAOYE Wangzhi;ZHANG Dawei;CHEN Guanhao(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《复合材料学报》2022年第11期5170-5180,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金面上项目(51878604,52078454)。

摘　　要：碳纤维织物增强水泥基复合材料(CFRCM)被广泛研究并应用于混凝土结构加固和性能自监测,但目前碳纤维的力阻响应机制尚不明确。本文通过CFRCM纤维束的拉拔试验发现其荷载-位移曲线符合典型的粘结滑移三阶段特征,拉拔过程中的电阻变化也呈现出波动缓慢上升-快速增长-缓慢增长的三阶段特征,碳纤维束脱粘阶段的电阻增长率与极限拉拔力呈现中高度的正相关性。进一步基于拉拔过程碳纤维束的力阻响应建立了纤维等效分层破坏模型及计算方法,为电阻信息与受荷状态的相互转化提供了新思路。Carbon fibric reinforced cementitious matrix(CFRCM)is often used in the reinforcement of concrete structures and self-sensing structures.However,the mechanism of piezoresistive response is still unclear.In this paper,through the pull-out test of CFRCM,it is found that the load-displacement curves present typical three-stage characteristics of bond-slip model,and the change of resistance during the pull-out test also presents three-stage characteristics,which contains random fluctuation rising,rapid growth and slow growth stages.Further analysis shows that the growth rate of resistance in the debonding stage of carbon fiber bundles has a medium-high positive correlation with the ultimate pull-out force.An equivalent delamination failure model and calculation method of carbon fiber were established based on the piezoresistive response of carbon fiber bundles in the pull-out progress,which realized the mutual conversion between the resistance information and the charged state.

关 键 词：碳纤维织物 水泥基 拉拔试验 力阻响应 等效分层破坏模型 

分 类 号：TU599[建筑科学—建筑技术科学]