Analyses of structural damage and parameter sensitivity for CRCP+AC composite pavement
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摘要: 分析了CRCP+AC复合式路面结构塑性损伤, 研究了不同荷载作用条件下结构应力与损伤的空间分布规律。利用正交试验方法, 以结构的拉张损伤作为考察指标, 对多种复杂的结构因素与环境因素进行了参数敏感性分析, 得到了各因素影响规律。根据极差、方差分析结果, 区分了变温作用、温度与荷载耦合作用条件下的主要与次要因素, 并依据影响效果进行了次序排列。研究结果表明: 结构损伤在CRCP面板深度范围内的分布存在差异, 导致拉应力的差异化分布; 重复行车荷载作用时, 随着结构应力软化现象的加剧, 结构损伤在初期呈现台阶式上升趋势, 后期则增长平稳; 根据结构最大塑性主应变的矢量方向可判断结构裂缝平面的法向; 综合考量不同荷载作用的分析结果, 沥青面层厚度、混凝土的线膨胀系数与面板的支撑情况是影响CRCP结构损伤最为重要的因素。
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关键词:
- 道路工程 /
- CRCP+AC复合式路面 /
- 结构损伤分析 /
- 正交试验 /
- 参数敏感性
Abstract: The structural plasticity damage of continuous reinforcement concrete pavement (CRCP) and asphalt concrete (AC) composite pavement was analyzed, the spatial distribution laws of structural stresses and damages under different loading conditions were studied.Orthogonal test method was used, the structural tensile damage was taken as an index, the parameter sensitivity analyses with a variety of complex structural and environmental factors were employed to obtain factor influencing laws.Based on the results of variance and range analyses, the primary and secondary factors were distinguished and ordered with their various influencing effects under temperature changing or temperature-load coupling conditions.Analysis result shows that there are differences in the distribution of structural damage along the depth range of CRCP slab, which lead to the difference distribution of tension stress.When repeated traffic loading is applied, the trend of structural damage steps up in the initial stage and is steady growth in the later stage with the intensification of structural stress softening.The normal direction of structural crack plane can be judged by the vector direction of maximum plasticity principal strain.Based on the comprehensive consideration of analysis results under different loading conditions, the thickness of asphalt layer, the linear expansion coefficient of concrete and the support state under CRCP slab are the most important influencing factors associated with the structural damage of CRCP. -
图 7 结构损伤与拉应力时程曲线
Figure 7. Time-history curves of structural damage and tensile stress
图 10 CRCP面板表面拉应力分布与等值线
Figure 10. Tensile stress distribution and isograms on CRCP slab surface
图 11 CRCP面板底面拉应力分布与等值线
Figure 11. Tensile stress distribution and isograms on CRCP slab bottom
图 12 CRCP面板最大塑性主应变矢量
Figure 12. Vectors of maximum plasticity principal strain for CRCP slab
表 5 变温作用条件下各因素影响水平
Table 5. Effect level of each factor under temperature changing condition
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表 6 变温作用条件下正交试验方差分析
Table 6. Variance analysis of orthogonal test under temperature changing condition
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表 7 变温作用条件下各因素的影响次序与效果
Table 7. Order and effect of each factor under temperature changing condition
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表 8 温度与荷载耦合作用下CRCP表面各因素影响水平
Table 8. Effect level of each factor on CRCP surface under temperature-load coupling condition
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表 9 温度与荷载耦合作用下CRCP底面各因素影响水平
Table 9. Effect level of each factor on CRCP bottom under temperature-load coupling condition
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表 10 0温度与荷载耦合作用下CRCP表面正交试验方差分析
Table 10. Variance analysis of orthogonal test on CRCP surface under temperature-load coupling condition
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表 11 1温度与荷载耦合作用下CRCP底面正交试验方差分析
Table 11. Variance analysis of orthogonal test on CRCP bottom under temperature-load coupling condition
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表 12 2温度与荷载耦合作用下各因素的影响次序与效果
Table 12. Order and effect of each factor under temperature-load coupling condition
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