An ongoing research project supported by the USA National Cooperative Highway Research Program (NCHRP) under the Transportation Research Board (TRB) of the National Academy of Science is aimed at developing the AASHTO LRFD Specifications for Serviceability in the Design of Bridge Foundations. The AASHTO specifications are traditionally observed on all federally aided projects and generally viewed as a national code of US highway practice, hence influencing the construction of all highway bridges throughout the USA. The development of the specifications requires: establishing serviceability criteria, compilation of databases for foundation displacements, determination of analysis methods, finding the uncertainty of the methods, and development of methodology and LRFD parameters for serviceability. The various components are outlined and examples are provided. The need for a multiphase approach in the development of serviceability criteria is presented and its feasibility is demonstrated.
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