Les exposés écrits du congrès ont été publiés dans la langue dans laquelle ils ont été soumis à l’ATC.
The Existing Pattullo Bridge over Fraser River in greater Vancouver area was built in 1937 to carry vehicular and pedestrian traffic between the City of Surrey and New Westminster. Over the period, it has become difficult to drive on its existing narrow lanes without median barrier. Moreover, the existing Pattullo Bridge does not meet the current seismic standards. The Pattullo Bridge Replacement Project is a solution to all the above-mentioned problems. The multi-use path (MUP) connection to the new bridge in Surrey is a vital component of the Pattullo Bridge Replacement Project. Its primary function is to ensure the uninterrupted movement of pedestrians and cyclists across the new bridge and between the new bridge and ground level beneath the new bridge in Surrey. It is an 11 span 4.0m wide Multi-User Path (MUP) Structure in an area full of geotechnical and environmental constraints. Due to significant drop in elevation required in limited available space, the MUP connection structure in Surrey is a 2-level composite steel girder bridge which spirals over multiple concrete piers supported by steel pipe piles. This paper discusses the challenges faced during design and construction of this unique structure due to its extremely irregular geometry, proximity to existing Pattullo Bridge and soils with potential to liquefaction and settlement. Moreover, Surrey MUP Structure is located in an area full of cultural and environmental constraints. Finite element analysis of Surrey MUP Structure was performed for its design and to check its seismic interaction with two other adjacent bridges sharing piers with it. An Expanded Polystyrene (EPS) foam embankment was proposed past abutment due to potentially settleable subgrade soils. All of this led to achieving a constructable solution for this bridge, hence meeting project functional requirements.