摘要
为了定量描述沥青混合料复合结构的层间破坏过程,本研究基于双线性内聚力模型,建立了直接拉拔试验中圆柱形沥青混凝土的三维有限元模型,该模型采用显式准静态方法求解了收敛问题,并系统比较了准静态参数(网格、加载曲线、质量缩放和模拟拉拔速率)对计算效率和精度的影响。结果表明,当加载曲线类型为光滑线、模拟拉拔速率为试验的10倍且质量缩放为100时,模型计算结果与试验结果最为一致,在沥青混合料复合结构拉拔破坏过程中,层间界面的最大应力集中在环形区域。
To quantitatively describe the interlayer failure process of asphalt mixture composite structure,a three-dimensional finite element model of cylindrical asphalt concrete in direct pull-out test was established based on bilinear cohesive force model.The convergence problem was solved by explicit quasi-static method.The effects of quasi-static parameters(mesh,loading curve,mass scaling and simulated drawing rate)on calculation efficiency and accuracy were systematically compared.The results show that when the loading curve type is smooth,the simulated drawing rate is 10 times of the test and the mass scale is 100,the model calculation results are most consistent with the test results.In the process of drawing failure of asphalt mixture composite structure,the maximum stress of the interlayer interface is concentrated in the ring region.
作者
彭成
方凯
钟启明
PENG Cheng;FANG Kai;ZHONG Qiming(School of Civil Engineering,University of South China,Hengyang,Hunan 421001,China;Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210000,China)
出处
《南华大学学报（自然科学版）》
2022年第3期37-46,共10页
Journal of University of South China：Science and Technology
基金
水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008)
湖南省教育厅一般项目(20C1608)。
关键词
沥青混凝土
内聚力模型
层间破坏
准静态
应力分布
asphalt concrete
cohesion model
interlayer failure
quasi static
stress distribution
