利用混凝土损伤塑性模型评价CRCP+AC复合式路面的损伤演变

在连续配筋混凝土复合式路面（CRCP＋AC）的研究中,CRCP面板的裂缝形态和分布模式是影响今后路面使用性能和生命周期的重要因素。研究采用ABAQUS有限元程序中的混凝土损伤塑性模型（CDP）表征CRCP面板的力学特性,结合三维瞬态热传导分析的温度场数据,分析了变温条件下的结构损伤情况;并进一步分析复合式路面在温度变化和交通荷载耦合作用下,CRCP面板损伤的演化规律以及裂缝张开闭合的行为特征。研究认为沥青面层的作用不仅仅局限在功能性方面,它可以明显改善CRCP面板的受力状况;复合式路面设计中应根据CRCP面板的温缩性能和损伤性能综合考虑沥青面层的合理厚度。

Evaluation on the Damage Evolution of the CRCP+AC Composite Pavement by the Concrete Dameged Plasticity Material Model

In the study on the CRCP＋AC composite pavement,the form and distribution pattern of cracks are two important factors influencing the performance and the lifetime of the pavement.The concrete damaged plasticity material model incorporated in the general purpose finite element software named ABAUQS was adopted to describe the mechanical characteristics of the CRC slab.Combining with the temperature field database drawn from the three-dimensional transient heat transfer analysis,the structural damage under the condition of temperature changing is analyzed.The structural damage evolution and the crack behavior of the CRC slab subjected to the thermal-mechanical coupling condition are further analyzed,which suggests that the role of the asphalt concrete surface is not confined only to the scope of improving the performance of the road,its capacity for improving the stress state of CRCP slab is worthwhile to be affirmed.And the reasonable thickness of AC layer should be designed in consideration of the thermal contraction and damage properties of the CRC slab comprehensively.