钢纤维地聚物混凝土轴压性能细观数值模拟  

Microscopic Numerical Simulation of Axial Compressive Properties of Steel Fiber Geopolymer Concrete

作　　者：毕继红[1,2] 王炯文 赵云 王照耀 张金波 Bi Jihong;Wang Jiongwen;Zhao Yun;Wang Zhaoyao;Zhang Jinbo(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点试验室,天津300072

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第3期77-84,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51227006)。

摘　　要：为研究细观尺度下钢纤维地聚物混凝土(SFRGPC)的轴压性能,考虑骨料和钢纤维在混凝土基体内部的随机分布,建立钢纤维地聚物混凝土棱柱体的三维细观尺度数值模型。对不掺纤维与掺纤维2种工况下钢纤维地聚物混凝土的轴压性能进行模拟,验证该细观尺度数值模型的准确性。在此基础上,分析钢纤维地聚物混凝土的轴压破坏行为,进一步探究骨料最大粒径和纤维掺量对混凝土轴压受力性能的影响规律。结果表明,地聚物混凝土峰值应力随骨料最大粒径增加而降低;骨料最大粒径的增加会略微降低地聚物混凝土的韧性指数;由于纤维对混凝土裂缝的桥接作用,地聚物混凝土的峰值应力和韧性指数随纤维掺量增加均有所提高,且韧性指数的提高更为显著。In order to study the axial compressive properties of steel fiber geopolymer concrete(SFRGPC)at mesoscale,a three-dimensional mesoscale numerical model of steel fiber geopolymer concrete prisms was established considering the random distribution of aggregate and steel fiber in the concrete matrix.The axial compression properties of steel fiber geopolymer concrete under two conditions of unmixed fiber and mixed fiber were simulated,and the accuracy of the mesoscale numerical model was verified.On this basis,the axial compressive failure behavior of steel fiber geopolymer concrete was analyzed,and the influence of aggregate maximum particle size and fiber content on the axial compressive performance of concrete was further explored.The results show that the peak stress of geopolymer concrete decreased with the increase of the maximum particle size of aggregate.With the increase of the maximum particle size of aggregate,the toughness index of geopolymer concrete would decrease slightly.Due to the bridge effect of fiber on concrete cracks,the peak stress and toughness index of geopolymer concrete increased with the increase of fiber content,and the toughness index increased more significantly.

关 键 词：地聚物混凝土 细观模拟 粘结单元 抗压性能 钢纤维 

分 类 号：TU528.572[建筑科学—建筑技术科学]