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摘要: 分析了AASHTO—1993和《力学经验法路面设计指南》 (MEPDG) 中连续配筋混凝土路面(CRCP) 平均裂缝间距模型特点, 现场采集了29个CRCP试验段共计1 171条裂缝间距数据, 对裂缝间距数据进行了归类、统计分析、分布拟合和方差分析。分别确定了AASHTO—1993和MEPDG模型参数, 并利用采集到的裂缝间距数据对2类模型进行了有效性验证。分析结果表明: CRCP裂缝形态可划分为6类; 4参数Dagum分布能更好地拟合CRCP裂缝间距分布; 相同配筋率不同板厚的CRCP平均裂缝间距没有显著差异; AASHTO—1993模型高估了平均裂缝间距, 误差为0.13m;MEPDG模型显著低估了平均裂缝间距, 误差为1.7m。
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关键词:
- 路面工程 /
- 连续配筋混凝土路面 /
- 裂缝间距 /
- 配筋率 /
- 力学经验法路面设计指南
Abstract: The characteristics of average crack spacing models for continuously reinforced concrete pavement (CRCP) in AASHTO—1993 and Mechanistic-Empirical Pavement Design Guide (MEPDG) were analyzed.A total of 1 171crack spacing data were collected from 29CRCP experimental sections.Classifying, statistical analysis, distribution fitting and variance analysis were conducted by using the data.The parameters of AASHTO—1993and MEPDG models were determined respectively, and two models were validated by using the data.Research result shows that cracks can be classified into six types according to the patterns, and CRCP crack spacing distribution is subject to four-parameter Dagum distribution.The differences of CRCP average crack spacings for different slab thicknesses at the same reinforcement ratio are not significant.AASHTO—1993model overestimates average crack spacing with an error of 0.13m, MEPDG model tremendously underestimates average crack spacing with an error of 1.7m. -
表 1 AASHTO—1993平均裂缝间距计算参数
Table 1. Calculation parameters of average crack spacing for AASHTO—1993
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表 5 不同板厚裂缝间距方差分析
Table 5. Variance analysis of crack spacing under different slab thicknesses
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