摘要
道路材料是一种典型的拉压模量不同的材料,而我国现行公路沥青路面设计规范采用压缩模量为材料参数指标,假定材料为各向同性弹性体,未充分考虑材料的拉压力学性能不同的特点。因此,本研究运用拉压不同模量理论,将路面材料假定为拉压弹性不同模量的材料,通过ABAQUS有限元软件的UMAT用户子程序功能,将拉压不同模量的材料本构进行二次开发,建立两种路面力学模型进行数值分析比较。结果表明,采用拉压不同模量模型计算得到的最大横向拉应力与基于压缩模量为材料参数的模型存在较大差异,最大横向拉应力可降低26.3%,采用拉压不同模量模型计算得到的最大拉应变增加了13%,而对于两种模型计算得到的最大剪应力变化非常小。
Road material is a typical material with different tensile and compressive modulus.However,the compression modulus is used as the material parameter index in the current highway asphalt pavement design specification in China.In this design specification,the material constitution is assumed to be isotropic elasticity,which does not fully consider the different characteristics of tensile and compressive mechanical properties.Therefore,the theories of different modulus of tension and compression are used to assume the pavement materials with different tensile and compressive elastic modulus in this study.Through the user subroutine function of material(UMAT)in ABAQUS finite element software,the material constitutive models with different tension and compression modulus are developed,and two pavement mechanical models are established for numerical analysis.The results show that there is a big difference between the maximum transverse tensile stress calculated by different modulus models and the model based on compressive modulus.The maximum transverse tensile stress can be reduced by 26.3%,and the maximum tensile strain calculated by using different modulus models of tension and compression increases by 13%,while the maximum shear stress calculated by the two models changes very small.
作者
牛敏强
邓明超
蔡良
苑苗苗
NIU Min-qiang;DENG Ming-chao;CAI Liang;YUAN Miao-miao(Xinbo Management Office,Guangdong Nanyue Transportation Renbo Expressway Management Center,Huizhou,Guangdong 516899,China;Guangdong Nanyue Transportation Dafenghua Expressway Management Center,Meizhou,Guangdong 514329,China;Guangzhou College of South China University of Technology,Guangzhou,Guangdong 510800,China)
出处
《黑龙江交通科技》
2022年第1期27-32,共6页
Communications Science and Technology Heilongjiang
关键词
路面结构
倒装结构
路面材料
拉压模量
有限元分析
modulus of tension and compression
pavement structure
inverted structure
mechanical properties
finite element analysis
