DIC方法在PVA纤维混凝土振动材性实验中的应用  

Application of DIC method in vibration material experiment of PVA fiber concrete

作　　者：蔡鹏飞 蒋明[1] CAI Pengfei;JIANG Ming(School of Civil Engineering,SUST,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（自然科学版）》2022年第3期45-50,共6页Journal of Suzhou University of Science and Technology（Natural Science Edition）

基　　金：国家自然科学基金资助项目(11172193);江苏省“十三五”重点学科项目(20168765)。

摘　　要：掺杂纤维能够有效改进混凝土的性能,由于亲水性、分散性好,聚乙烯醇(PVA)被广泛应用于混凝土改性。为了研究不同PVA纤维掺量的混凝土柱在地震作用下的特性,对标准养护条件下掺有不同比例PVA纤维的混凝土柱进行振动台模拟地震试验研究,由数字图像相关(DIC)系统采集正弦波荷载作用下混凝土柱节点区域的序列数字散斑图像并计算分析。试验结果表明,在裂缝开展初期,纤维的混凝土柱节点区域在正弦波荷载作用下的横向平均主应变随纤维掺量的增加而减小、正弦波的循环周期等随纤维掺量的增加而提升。Doped fiber can effectively improve the performance of concrete.Due to its good hydrophilicity and dispersity,polyvinyl alcohol(PVA)has been widely used in concrete modification.In order to study the characteristics of concrete columns with different PVA fiber content under earthquake action,we carried out the shaking table simulation seismic test for concrete columns mixed with different proportions of PVA fiber under standard curing conditions.Digital image correlation(DIC)system was used to collect and analyze sequential digital speckle images of concrete column joints under sinusoidal wave load.The results show that at the initial stage of crack development,the transverse average principal strain of the concrete column joint area under the action of sinusoidal wave decreases with the increase of fiber content,and that the cycle period of sinusoidal wave increases with the increase of fiber content.

关 键 词：PVA纤维混凝土 纤维掺量 数字图像相关 振动台 循环周期 

分 类 号：TU502[建筑科学—建筑技术科学]