[1] Zhao Yanjing, Ni Fujian,. Reflective cracking viscoelastic responseof asphalt concrete under dynamic vehicle loading [J]. Journal of Southeast University (English Edition), 2009, 25 (3): 391-394. [doi:10.3969/j.issn.1003-7985.2009.03.022]
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Reflective cracking viscoelastic responseof asphalt concrete under dynamic vehicle loading(
)
动载作用下沥青混凝土路面反射裂缝粘弹性响应分析
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 25
- Issue:
- 2009 3
- Page:
- 391-394
- Research Field:
- Traffic and Transportation Engineering
- Publishing date:
- 2009-09-30
Info
- Title:
- Reflective cracking viscoelastic responseof asphalt concrete under dynamic vehicle loading
- 动载作用下沥青混凝土路面反射裂缝粘弹性响应分析
- Author(s):
- Zhao Yanjing; Ni Fujian
- School of Transportation, Southeast University, Nanjing 210096, China
- Keywords:
- asphalt pavement; viscoelastic; finite element method; reflective cracking; dynamic vehicle loading
- PACS:
- U443.33
- DOI:
- 10.3969/j.issn.1003-7985.2009.03.022
- Abstract:
- In order to investigate the mechanical response of reflective cracking in asphalt concrete pavement under dynamic vehicle loading, a finite element model is established in ABAQUS.The viscoelastic behavior is described by a prony series which is calculated through nonlinear fitting to the creep test data obtained in the laboratory.Based on the viscoelastic theory, the time-temperature equivalence principle, fracture mechanics and the dynamic finite element method, both the J-integral and the mix-mode stress intensity factor are utilized as fracture evaluation parameters, and a half-sine dynamic loading is used to simulate the vehicle loading.Finally, the mechanical response of the pavement reflective cracking is analyzed under different vehicle speeds, different environmental conditions and various damping factors.The results indicate that increasing either the vehicle speed or the structure damping factor decreases the maximum values of fracture parameters, while the structure temperature has little effect on the fracture parameters. Due to the fact that the vehicle speed can be enhanced by improving the road traffic conditions, and the pavement damping factor can become greater by modifying the components of materials, the development of reflective cracking can be delayed and the asphalt pavement service life can be effectively extended through both of these ways.
- 为研究沥青混凝土路面内部反射裂缝在动态荷载作用下的力学响应, 采用ABAQUS有限元软件建立分析模型.通过对沥青混凝土蠕变试验曲线进行非线性拟合, 得到Prony级数以赋予模型中面层粘弹性材料属性.基于粘弹性理论、时温等效原理、断裂力学及动力学有限元方法, 利用半正弦荷载模拟动荷载作用, 以断裂参数J积分以及复合应力强度因子作为裂缝扩展评价指标, 对路面反射裂缝在不同车速、不同环境温度以及不同材料阻尼系数等条件下的力学响应进行分析.计算结果表明:反射裂缝断裂参数值随车辆行驶速度的增加而减小;不同结构温度下的断裂参数差异不明显;断裂参数曲线随阻尼比的增大而逐渐后移, 且最大值逐渐减小.因此, 通过改善车辆行驶条件以提高车辆行驶速度, 以及通过改进材料组成来增大沥青混凝土阻尼系数, 都能够有效延缓反射裂缝扩展速度, 延长路面的正常使用寿命.
References:
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Memo
- Memo:
-
Biographies: Zhao Yanjing(1983—), male, graduate;Ni Fujian(corresponding author), male, doctor, professor, nifujian@gmail.com.
Citation: Zhao Yanjing, Ni Fujian.Reflective cracking viscoelastic response of asphalt concrete under dynamic vehicle loading[J].Journal of Southeast University(English Edition), 2009, 25(3):391-394.