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[1] Dong Niya, Li Chang, Ni Fujian, Finite element modeling of pavement responsesbased on stress-dependent properties of asphalt layer [J]. Journal of Southeast University (English Edition), 2015, 31 (3): 401-406. [doi:10.3969/j.issn.1003-7985.2015.03.018]
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Finite element modeling of pavement responsesbased on stress-dependent properties of asphalt layer()
基于沥青面层应力依赖性的路面响应有限元模拟
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
31
Issue:
2015 3
Page:
401-406
Research Field:
Traffic and Transportation Engineering
Publishing date:
2015-09-20

Info

Title:
Finite element modeling of pavement responsesbased on stress-dependent properties of asphalt layer
基于沥青面层应力依赖性的路面响应有限元模拟
Author(s):
Dong Niya1;  Li Chang1;  Ni Fujian1;  2
1School of Transportation, Southeast University, Nanjing 210096, China
2Road Maintenance Technology Engineering Center of Jiangsu Province, Southeast University, Nanjing 210096, China
董尼娅1;  李昶1;  倪富健1;  2
1东南大学交通学院, 南京 210096; 2东南大学江苏省道路养护工程技术研究中心, 南京 210096
Keywords:
dynamic modulus test;  loading frequency;  stress-dependent model;  user-defined material(UMAT)subroutine;  pavement responses
动态模量试验;  荷载频率;  应力依赖性模型;  UMAT子程序;  路面响应
PACS:
U416.217
DOI:
10.3969/j.issn.1003-7985.2015.03.018
Abstract:
In order to investigate the stress-dependent properties of hot-mix asphalt(HMA), a dynamic modulus test was conducted on a group of AC-20 specimens at various stress states and loading frequencies, respectively. A user-defined material(UMAT)subroutine incorporating stress-dependent constitutive model was developed and finite element(FE)simulation was utilized to confirm the validity of the UMAT. A three-dimensional(3D)FE model for typical pavement structure was established, considering the HMA layer as a stress-dependent material and other layers as linear elastic materials. Periodic load was applied to the pavement model and the pavement responses were calculated, including dynamic modulus distributions, surface deflection, shear stress and tensile strain in the HMA layer, etc. Both test results and FE model predictions indicate that the dynamic modulus of asphalt concrete is sensitive to stress state and loading frequency. Using the nonlinear stress-dependent model results in greater predicted pavement responses compared with the linear elastic model. It is also found that the effects of stress-dependency on pavement responses become more significant as loading frequency decreases.
为了探究沥青混合料的应力依赖性质, 分别在不同应力状态及荷载频率下对一组AC-20试件进行了动态模量试验.开发了一个包含应力依赖本构模型的用户自定义材料子程序并利用有限元模拟证实了其有效性.建立了一个典型路面结构的三维有限元模型, 将沥青面层视为应力依赖性材料, 而其他结构层为线弹性材料.对路面模型施加周期性荷载, 并计算得到路面响应, 包括动态模量的分布、路表弯沉、沥青面层的剪应力及拉应变等.试验结果及有限元模型预测值均表明了沥青混凝土的动态模量对应力状态及荷载频率具有敏感性.与线弹性模型相比, 使用非线性应力依赖模型得到的预测路面响应更大;应力依赖性对路面响应的影响随着荷载频率的减小变得更加显著.

References:

[1] Al-Qadi I, Wang H, Tutumluer E. Dynamic analysis of thin asphalt pavements by using cross-anisotropic stress-dependent properties for granular layer [J]. Transportation Research Record, 2010, 2154: 156-163.
[2] Ma X, Ni F J, Chen R S. Dynamic modulus test of asphalt mixture and prediction model [J]. China Journal of Highway and Transport, 2008, 21(3): 35-39.(in Chinese)
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Memo

Memo:
Biographies: Dong Niya(1987—), female, graduate; Ni Fujian(corresponding author), male, doctor, professor, nifujian@gmail.com.
Foundation item: Jiangsu Provincial Transportation Science and Technology Project(No.2011Y02-1-G1).
Citation: Dong Niya, Li Chang, Ni Fujian.Finite element modeling of pavement responses based on stress-dependent properties of asphalt layer[J].Journal of Southeast University(English Edition), 2015, 31(3):401-406.[doi:10.3969/j.issn.1003-7985.2015.03.018]
Last Update: 2015-09-20