考虑粗糙度的FRP-混凝土单剪试验细观模拟  

Mesoscopic Simulation of FRP-Concrete Single Shear Test Considering Roughness

作　　者：陈珍平 刘庆辉[1] 张雷[2,3] 乔丕忠 CHEN Zhenping;LIU Qinghui;ZHANG Lei;QIAO Pizhong(College of Mechanics and Materials,Hohai University,Nanjing 211100,Jiangsu,China;Yellow River Institute of Hydraulic Research,YRCC,Zhengzhou 450003,Henan,China;Henan Engineering Research Center of hydropower engineering abrasion test and protection,Zhengzhou 450003,Henan,China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100 [2]黄河水利委员会黄河水利科学研究院,河南郑州450003 [3]河南省水电工程磨蚀测试与防护工程技术研究中心,河南郑州450003 [4]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《力学季刊》2024年第1期58-69,共12页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(52279129,51809164,52279134)。

摘　　要：将混凝土模拟为由砂浆和骨料构成的二相复合材料,考虑混凝土表面的粗糙度,建立纤维增强树脂(Fiber Reinforced Polymer, FRP)-混凝土单剪试验细观有限元模型.为描述FRP-混凝土单剪试验过程中的损伤失效过程,分别采用塑性损伤模型和线弹性模型模拟混凝土两相材料和FRP的力学行为.为揭示混凝土表面粗糙度对FRP-混凝土单剪试验的影响,生成均方根高度分别为0.4 mm和0.8 mm的二维随机粗糙表面.研究结果表明,建立的FRP-混凝土细观有限元模型能够有效模拟FRP-混凝土单剪试验中的损伤失效过程,得到的荷载位移曲线和破坏模式均与试验结果有良好的一致性;随着混凝土表面粗糙度的增加,环氧树脂与混凝土上表面机械咬合力增加,FRP-混凝土试样承载力也随之提升.A mesoscopic finite element model of fiber reinforced polymer(FRP)-concrete single shear test is developed considering the roughness of the concrete surface,and taking the concrete as a composite composed of mortar and aggregate.In order to describe the damage failure process of FRP-concrete interface in single shear test,the plastic damage model and linear elastic model are,respectively,used to simulate the mechanical behaviors of the two phases of concrete and FRP.To reveal the influence of concrete surface roughness on the failure process of FRP-concrete single shear test,two-dimensional random rough surfaces with root mean square height of 0.4 mm and 0.8 mm are generated.The results show that the established mesoscopic finite element model can effectively simulate the damage failure process of FRP-concrete interface in the single shear test,and the obtained load-displacement curve and failure mode are in good agreement with the test results.With the increase of the surface roughness of concrete,the effect of mechanical interlocking between epoxy resin and concrete surface increases,and the load-bearing capacity of the FRP-concrete specimen also becomes larger.

关 键 词：FRP-混凝土单剪试验 细观模拟 随机骨料模型 二维随机粗糙表面 

分 类 号：TU398[建筑科学—结构工程]