ASSESSMENT OF TRAFFIC LOADING USED IN PAVEMENT DESIGN AND EVALUATION

• Main Author: Rustandi, Edy
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2878
• Institution: Institut Teknologi Bandung

The traffic loading carried by the pavement varies both in space and time. Design traffic loading in normally expressed in terms of cumulative standan axles during a design period. The conversion of an axle load to the standard 80 kN axle is calculated using Equivalence Factors calculated from the equation [ada rumus]. The investigation of the equivalence ractor was carriea out rrom the AEHSHTU pavement structural model. The results of this study show the equivalence factor of an axle load is influenced by the structural number and the difference between the initial and the terminal Present Serviceability Indexes. But, for terminal Present Serviceability Index of 1.50, the equivalence factor is independent on the structural number. Yet, in general, for axle loads up to 1.5 times the standard axle load, the Liddle formula is found to give the equivalence factor which is reasonably closed to that calculated from the AASHTO pavement structural model. In assessment of traffic loading, the front axle of the vehicle, Single Axle Single Wheel (SASW), is treated the same as the Single Axle Dual Wheel (SADW). The investigation of the equivalence factors and the influence of SASW on the pavement structure was carried out according to the analytical design approach (computer program DAMA). For Indonesia conditions, and, for the range of pavement structures analyzed, the power factor of Liddle Formula is found to be in between 3.25 and 4.50. It is also shown that applying the equivalence factor of a single axle dual wheel (SADW) load to a single axle single wheel (SASW) load tends to be less conservative for heavier SASW loads, especially on pavement structures with greater structural number. <br /> The examination of overloading cases and the determination of truck factor was obtained by conducting axle load surveys and analysis of data. The results of this study indicate that the truck factors of T 1.2H vehicle type are 5.20 and 3.57, in the direction to Java and in the direction to Sumatera, respectively. The results of this study also indicate that the overloading case which is found to about 50 % of all the commercial vehicles observed.