Bridge construction is a challenging engineering discipline which requires a good understanding of
technology and structural behaviour. Generally, superstructure type, material, weight, availability of
equipment, technical know-how, local conditions, schedule, and much more influence the means and
methods of bridge construction. Especially for major and complex bridges, the choice of a cost-effective
and reliable erection method as well as a diligent construction engineering approach are paramount for
success. But even standard bridges require utmost attention in this regard because each situation is
somehow different.
As several factors influence bridge constructability, it is of importance that a cost-effective and reliable
erection method is developed in the conceptual design stage, rather than in the construction stage
where most design parameters are effectively locked-in. Adjusting bridge design parameters at the
construction stage due to constructability concerns can result in significant costs and delays. Conversely,
considering constructability at the design stage prevents cost and schedule overruns, and yields
synergistic efficiency gains by jointly addressing constructability and limit state requirements.
Via case studies of three complex steel bridge projects, this paper will demonstrate the importance of
constructability as a design objective. It describes how the aspect of constructability was implemented
in the design phases to confirm that the following construction phases could be executed without costly
revisions and delays. In all three situations, the overarching goal was to capitalize on synergy effects and
efficiency without compromising safety, structural integrity, and durability. Hereby, design and
construction reliability was achieved by addressing constructability as a design objective.