Effects of Loading Sequence on Fatigue Damage Accumulation of Asphalt Mixture
FANG Chenze1,2, GUO Naisheng1, JIANG Jiwang2,3, LENG Zhen2,*, LI Hui2,3, LU Guoyang2, WANG Haopeng4
1 Department of Transportation Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China 2 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China 3 Department of Transportation, Southeast University, Nanjing 210096, China 4 Nottingham Transportation Engineering Centre, University of Nottingham, Nottingham NG7 2RD, UK
Abstract: The accumulation process of fatigue damage of asphalt mixture under variable amplitude loading exhibits an obvious nonlinear characteristic. However, the traditional linear damage accumulation criterion fails to characterize the nonlinear fatigue damage accumulation (NLFDA) under different loading sequences. This study aims to investigate the effects of loading sequence on the fatigue damage accumulation of asphalt mixture. First, the fatigue tests with constant amplitude loading were carried out to investigate the fatigue damage accumulation under constant amplitude loading. Then, the SCB fatigue tests with variable amplitude loading were conducted to analyze the fatigue damage accumulation under variable amplitude loading. Finally, the NLFDA model considering the loading sequence was established to analyze the effects of loading sequence on the fatigue damage accumulation of asphalt mixture. It was found that the fatigue damage of asphalt mixture under constant amplitude loading evolved nonlinearly, however, it obeyed linear damage accumulation criterion and the cumulative life fractions are equal to one. The variable amplitude loading can lead to that the fatigue damage evolves nonlinearly and obeys nonlinear damage accumulation criterion, and the cumulative life fractions of the loading sequences of low-high and high-low are greater than one and less than one, respectively. The established NLFDA model can effectively characterize the dependence of the fatigue damage of asphalt mixture on the loading sequence.
通讯作者:
*冷真,香港理工大学土木及环境工程学系终身副教授、博师研究生导师,道路研究所所长,碳中和资源工程研究中心副总监。先后在东南大学取得本科及硕士学位、在美国伊利诺伊大学香槟分校取得博士学位。主要研究方向包括:可持续与智慧铺面材料与技术,及交通基础设施无损检测。已发表SCI期刊论文100余篇。现任美国土木工程师学会大中华分会会长、国际铺面科学与工程学会副主席、国际华人基础设施工作者协会理事、世界交通运输大会沥青路面学科主席、香港交通研究学会理事、及香港公路学会理事;任期刊Journal of Cleaner Materials创刊主编,Journal of Cleaner Production(中科院一区期刊)执行主编,ASCE Journal of Materials in Civil Engineering和 Journal of Transportation Engineering,Part B:Pavements副主编,及其他多个SCI期刊编委。zhen.leng@polyu.edu.hk
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