Finite element implementation of the microplane theory for simulating a rigid concrete pavement-vehicle interaction

This paper presents an approach for modeling concrete pavement, based on the constitutive implementation of Bazant's microplane theory, for the purpose of predicting pavement response due to complex loading by vehicles. This includes implementation of the microplane theory in a three dimensional finite element code and verification of its numerical accuracy. The analytical method is then verified. The program's accuracy under simple static loading is verified by comparison with two of the most widely used pavement design codes. Experimental data from the literature are used to verify the approach developed for both cyclic response and prediction of material softening, a critical feature of the Portland Cement Concrete (PCC) concrete material used in pavement. The analysis is also verified against experimental influence function data for a single axle. Finally, the analytically predicted pavement response is verified for dynamic multi-axle truck loading. Based on agreement with experimental data, the model developed captures the essential characteristics of concrete pavement subjected to complex vehicle loading, and accordingly, the model has the potential for use in other more specific pavement studies.