Responses of Flexible Pavement Structure to Variation of Load Type, Material Characteristics, and Service Life using Kenlayer Program
One of the pavement types often used in Indonesia is flexible pavement. Many methods and programs can be used for flexible pavement structure analysis, such as analytical method using Kenlayer program. Variation of load type (single axle, dual-tandem, and dual-tridem) and material characteristics (linear-elastic, and nonlinear-elastic) used to approach the real condition in the field. In addition, repetition load during service life to failure criteria of flexible pavement structure with several variations of its design attributes need to be considered to gain more understanding for its pattern and relationship. This research aims to analyse the relationship for variation of load type, material characteristics to its response; and failure criteria in service life analysis with some attribute variant. Based on the results from Kenlayer program for variation of load type: the maximum response for each load type is (0; 17.15) for single-axle and dual-tandem, and (121.9; 17.15) for dual-tridem. The biggest response of deflection is resulted from dual-tridem followed by dual-tandem while load type variant has insignificant response to stress and strain. The variation of material characteristics indicates linear material (L-L-L) has higher value of flexible pavement responses compared to non-linear material (L-NL-NL). In case of service life analysis, failure criteria mostly resulted from permanent deformation for variation of loads, and resilient modulus of each layer, nevertheless the different result is observed in thick layer of surface and base course where fatigue cracking is more dominant.
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