Sydney Airport Corporation Limited required the inclusion of a runway end safety area (RESA) at the 07/25 end of the east-west runway to cater for the new A380 aircraft and comply with the mandatory requirements of the Civil Aviation Safety Authority. In order to include the required 90m by 90m extension, existing infrastructure within this area required protection or support using extensive bridge structures. An existing above ground sewer known as the South Western Suburbs Ocean Outfall Sewer (SWSOOS) required an overhead bridge protection structure forming the surface of the RESA and in another location required support where the new realigned airport perimeter road crosses under the SWSOOS. The new overhead bridge structure forming the RESA also extends over the perimeter road.

The bridge structure over the heritage listed SWSOOS which supports the RESA is subjected to extreme live loads exerted when aircraft under full braking conditions enter the RESA. This paper presents the make-up of these loads as well the design of the deck protection structure to account for these loads.

This paper also covers the design development of the support structure for the SWSOOS which comprises a large longitudinally and transversely post-tensioned beam and slab bridge, constructed under the SWSOOS using self-compacting concrete. A project specific flowable concrete mix was designed, trialled and tested to mitigate the constructability risk of placing the concrete.