Finite Element Analysis of Reflection Crack in AC+CRC Composite Pavement
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摘要: 为给复合式路面的使用寿命预估提供参考, 采用有限元软件建立了带裂缝的沥青混凝土罩面连续配筋水泥混凝土(AC+CRC)复合式路面结构应力分析模型, 对在正载和偏载作用下沥青面层正应力和剪应力分布进行了分析.计算了沥青层荷载型反射裂缝应力强度因子, 分析出结构层厚度、模量、配筋率、层间结合状态对AC层反射裂缝扩展的影响.分析结果表明, 增加AC层厚度及底基层模量、提高CRC层配筋率、改善层间结合状态等均能较好地抑制复合式路面反射裂缝的发展, 而CRC层厚度及模量、AC层模量对复合式路面反射裂缝的发展基本没有影响.研究结果可为AC+CRC复合式路面结构设计提供一定的理论依据.Abstract: In order to provide input for estimate the service life of the composite pavement, the authors established the stress analysis model for the continuously reinforced concrete with asphalt concrete overlay (AC + CRC) composite pavement with initial cracking, by using the finite element software, and analyzed the corresponding normal stress and shear stress under symmetry and eccentric loading.The stress intensity factors for reflection cracking in the AC layer were quantified with varying structure thickness, modulus, steel ratio and AC-CRC inter-layer conditions.Results of the analysis indicate that increasing thickness of AC layer, modulus of subbase, steel ratio, and inter-layer bonding can delay the propagation of the reflection cracking.However, the modulus and thickness of CRC layer, and modulus of AC layer have little effects on the cracking propagation.These results could provide a theoretical basis for designing AC + CRC composite pavement.
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