PVA-ECC与BFRP筋黏结性能试验分析  

Experimental analysis on bond properties of PVA-ECC and BFRP bars

作　　者：武芳文[1] 段钧淇 何岚清 梅韵歌 卞正容 张智举 刘来君[1] 杨飞 WU Fangwen;DUAN Junqi;HE Lanqing;MEI Yunge;BIAN Zhengrong;ZHANG Zhiju;LIU Laijun;YANG Fei(School of Highway,Chang′an University,Xi′an 710064,China;School of Civil Engineering,Chang′an University,Xi′an 710061,China;China Railway Engineering Design and Consulting Group Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]长安大学公路学院,西安710064 [2]长安大学建筑工程学院,西安710061 [3]中铁工程设计咨询集团郑州设计院,郑州450000

出　　处：《哈尔滨工业大学学报》2023年第7期70-79,共10页Journal of Harbin Institute of Technology

基　　金：国家重点研发计划(2021YFB2601000);陕西省自然科学基础研究计划重点项目(2022JZ-32);中央高校基本科研业务费资金(300102212212)。

摘　　要：为研究聚乙烯醇纤维增强工程水泥基复合材料(polyvinyl alcohol fiber reinforced engineered cementitious composites,PVA-ECC)与玄武岩纤维增强复材筋(basalt fiber reinforced polymer bars,BFRP筋)的黏结性能,以BFRP筋表面形式(缠绕带肋、喷砂缠绕带肋)、锚固长度(5 d、7 d、9 d)、直径(8、10、12 mm)、PVA-ECC保护层厚度(70、25、15、5 mm)和PVA-ECC强度(C50、C80)为参数,设计制作28个PVA-ECC与BFRP筋黏结锚固试件进行拔出试验。通过观察和分析各试件的破坏形态、黏结强度和黏结滑移曲线,探究了各因素对PVA-ECC和BFRP筋的黏结性能的影响规律。最后,通过分析已有本构模型的适用性,根据试验结果建立了BFRP筋与PVA-ECC的黏结滑移本构模型。研究结果表明:较小保护层厚度(5 mm)的试件容易发生劈裂破坏,且黏结强度仅为正常试件的39.59%;BFRP筋表面喷砂可提高最大平均黏结应力;随着锚固长度的降低,BFRP筋与PVA-ECC黏结强度逐渐提高;增大筋材直径的同时保证相对肋高不变可以避免BFRP筋直径增大对黏结性能带来的不利影响;当PVA-ECC强度从50.5 MPa提高至81.3 MPa时,黏结强度提高了45.53%。避免BFRP筋较小的保护层厚度,或增加BFRP筋直径的同时保证相对肋高不变可以保证PVA-ECC与BFRP筋有足够的黏结强度。To investigate the bond properties of polyvinyl alcohol fiber reinforced engineered cementitious composites(PVA-ECC)and basalt fiber reinforced polymer(BFRP)bars,the surface form of BFRP bars(wrapped ribbed,sandblasted wrapped ribbed),anchorage length(5 d,7 d,9 d),diameter(8,10,12 mm),thickness of PVA-ECC protective layer(70,25,15,5 mm)and PVA-ECC strength(C50,C80)are taken as parameters,and 28 bond anchorage specimens of PVA-ECC and BFRP bars were designed and manufactured by pull-out test.By observing and analyzing the failure mode,bond strength and bond-slip curve of each specimen,the influence of various factors on the bond performance of PVA-ECC and BFRP bars were explored.Finally,by analyzing the applicability of the existing constitutive model,the bond-slip constitutive model of BFRP bars and PVA-ECC were established with reference to the test results.The results show that the specimens with smaller protective layer thickness(5 mm)are prone to fracture failure,and the bond strength is only 39.59%of that of normal specimens.Sandblasting on the surface of BFRP bars could increase the maximum average bond stress.With the decrease of anchorage length,the bond strength between BFRP bars and PVA-ECC increase gradually.Keeping the relative rib height unchanged while increasing the diameter of BFRP bars could avoid the negative effects of increasing the diameter of BFRP bars on the bond properties.When the strength of PVA-ECC increases from 50.5MPa to 81.3MPa,the bond strength increases by 45.53%.Avoiding the smaller protective layer thickness of BFRP bars or increasing the diameter of BFRP bars while keeping the relative rib height unchanged could ensure that PVA-ECC and BFRP bars exhibit sufficient bond strength.

关 键 词：聚乙烯醇纤维增强工程水泥基复合材料 玄武岩纤维增强复材筋 拔出试验 黏结性能 本构模型 

分 类 号：TU528[建筑科学—建筑技术科学]