Asphalt Pavement Performance Analysis Tool: TTI VESYS5W

VESYS5 is a well developed mechanistic flexible pavement analysis computer program. However, it is a DOS program, and its inputs and outputs were very complicated. It is difficult for users to apply the program to analyze the performance of flexible pavements. Texas Transportation Institute (TTI) VESYS5W is a Windows version of VESYS5. TTI VESYS5W provides a user-friendly input and output interface and significantly improves the usability of the existing VESYS5 program. This report documents TTI VESYS5W release version 1.0. Also, a simple case is provided in the report. It is well known that the challenging task of predicting pavement performance is to determine the pavement material properties including modulus, rutting, and fatigue cracking, etc. One of the special features of the enhanced VESYS5 program is that the default values of material properties have been built into the program. These default values were recommended based on substantial literature review and laboratory testing. In addition, the laboratory test protocols have also been developed to determine these material properties. It should also be noted that the current TTI VESYS5W was calibrated by limited accelerated pavement test (APT) rutting data, further calibration on rutting and fatigue cracking models is needed, especially using the field experimental sections. Moreover, further study on the influence of climate on performance prediction is needed.