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| 摘要: |
| 研究了变温下沥青混合料的剪切疲劳变形,结果表明,沥青混合料不只在升温阶段产生剪切疲劳变形增量,在降温阶段也会产生剪切疲劳变形增量;随温度的变化,沥青混合料剪切疲劳变形呈跳跃性增长,这与实际路面车辙增长趋势相似.通过典型温度变形叠加方法的比选,在时间硬化叠加方法的基础上,建立了变温下沥青混合料剪切疲劳变形的叠加模型.由于该模型考虑了疲劳变形的非线性以及温度的作用顺序,因此较好地拟合了变温下沥青混合料的剪切疲劳变形. |
| 关键词: 变温 剪切疲劳变形 时间硬化 |
| DOI： |
| 分类号:U414 |
| 基金项目:国家自然科学基金 |
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| Accumulation Model of Shear Fatigue Deformation for Asphalt Mixture with Changing Temperature |
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YUAN Jun JIA Lu SUN Li-jun
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| Abstract: |
| Shear fatigue deformation of asphalt mixture with changing temperature was studied.The result shows that shear fatigue deformation increase of asphalt mixture forms not only with temperature rise,but also with temperature decrease.Shear fatigue deformation of asphalt mixture exhibits leaping increase with changing temperature,which is similar to the real situation in site.By comparing typical temperature deformation accumulation models,and on the basis of time hardening superposition approach,a new superposition model of shear fatigue deformation of asphalt mixture with changing temperature is proposed.Because this new model takes nonlinearity of fatigue deformation curve and sequence of temperature into account,it can perfectly simulate shear fatigue deformation of asphalt mixture with changing temperature. |
| Key words: changing temperature,shear fatigue deformation,time hardening, |
