玄武岩纤维筋连续配筋复合式路面荷载应力分析

Analysis of the Load Stress of BFRP Continuously Reinforced Composite Pavement

运用ABAQUS有限元软件,建立了基于弹性地基双层板模型和裂缝模式下的玄武岩纤维筋连续配筋复合式路面荷载应力有限元模型,提出用粘结单元定义裂缝接触面的法向和切向接触本构行为,即用裂缝剪切刚度来模拟裂缝间的嵌锁作用。通过分析确定了不同裂缝间距下复合式路面的临界荷位——纵向自由边中部,并比较了BFRP筋和钢筋两种配筋条件下混凝土板应力随AC层厚度、CRC层厚度、筋位置、配筋率及裂缝剪切刚度的变化规律。计算结果表明,2种配筋条件下混凝土板应力值随参数变化规律相似,应力值基本相等,这为BFRP筋应用于CRC+AC复合式路面提供了理论依据。

In this paper,the finite element software ABAQUS is used to build the load stress model about BFRP（ basalt fiber reinforced polymer） continuously reinforced composite pavement. The model is based on the double panel model on the elastic foundation and the cohesive element is applied to define the normal and tangential contact constitutive behavior of cracks,in another word,the joint shear stiffness is used to simulate interlock action between cracks. Through a mass of analysis,the middle of longitudinal free edge is found out as the critical load position under different transverse crack spacing. In both cases of BFRP reinforcement and steel reinforcement,the influence of the thickness of AC and CRC layer,bar distribution,reinforcement ratio,joint shear stiffness on the concrete slab stress is discussed.The calculation results indicate that the value and change law of concrete slab stress is similar,which provide theoretical foundation for the BFRP applied to CRC ＋ AC composite pavement.