Bridges

In the design and analysis of bridge pile caps the requirements of AS51000.5-2017 can be interpreted by the designer to achieve an array of design solutions that may be compliant and fit for purpose but may not always be the most efficient solution.

Whilst there is ample guidance provided for bridge superstructure and substructure pile design the design of bridge pile caps is generally quite bespoke and open to designer interpretation.

This paper proposes a review of the options for pile cap design via different strut and tie models or flexural design for strength and serviceability. In trialling these approaches as applied to typical pile cap design examples the paper will provide an assessment of design, construction, cost and sustainability outcomes.

With a secondary focus on sustainability the underlying material cost and carbon footprint outcomes that result from designer choices should not be underestimated. It is hoped that the discussion on the benefits/differences between design approaches will provide a simplified guide to inform emerging designers to better understand best practice and the opportunity that we all have to work towards a sustainable future.