PREPAK is an interactive analysis system for use in the design of multispan post-tensioned non-prismatic concrete bridges with several construction stages. BRILO is an interactive analysis system for the estimation of design load effects in bridge structures, for a given set of multi lane loading rules specified in a code of practice. This program is suitable for any road, railway or footbridge which can be modelled as a skeletal frame with prismatic beams.

The BRILO program is principally designed to provide bending moment envelopes to be used in PREPAK. The program also estimates all other critical load effects such as shear, torsion, axial force, deflection, rotation and support reactions. The architectures of these programs are similar. They comprise a master program which sets up a database, and a number of subprograms for reading and vetting data input, analysis, presentation of numerical results and production of graphical design aids. These programs have been developed within the Ove Arup Partnership and embody the collective experience of a number of bridge engineers.

The paper describes the scope of these two programs and illustrates their use by means of examples.

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