DIPLOMAT: analysis program for bituminous and concrete pavements

Lev Khazanovich, Anastasios M. Ioannides

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Burmister's layered elastic theory is extended to accommodate an interior loading of a multilayered pavement system incorporating an arbitrary sequence of elastic plates and spring beds, in addition to isotropic layers. The formulation is coded into a new computer program, called DIPLOMAT, thereby allowing for the first time direct comparisons between the distinct analytical approaches conventionally used for so-called rigid and flexible pavements. The new program is as user friendly and computationally efficient as the widely used layered elastic analysis program BISAR. In addition to permitting multiple-wheel loads, DIPLOMAT may be used to investigate the effects of a variety of interface and boundary conditions, including that of a rigid base. When considering a plate on grade, DIPLOMAT reproduces the closed-form solutions by Westergaard (dense liquid foundation) and by Losberg (elastic solid foundation). On the other hand, for a pavement section consisting of up to five isotropic layers, the new program reproduces the BISAR solutions for bonded or unbonded layers. A number of applications of the program are presented, including an assessment of the structural contribution of compressible (granular or bituminous) bases under a concrete pavement slab, and determination of the interface spring stiffness that accounts for constructed layer compressibility. Some implications of program results to pavement design are also discussed.

Original languageEnglish (US)
Pages (from-to)52-60
Number of pages9
JournalTransportation Research Record
Issue number1482
StatePublished - Jul 1995
Externally publishedYes


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