Image: Pattullo Bridge: Seismic Upgrade Solution

Industrial & Infrastructure1 min read

Pattullo Bridge: Seismic Upgrade Solution

New Westminster, BC, Canada
1995 - 2006

The Pattullo Bridge was built in 1938. The GVTA retained Ausenco in 2006 to conduct condition and seismic assessments, and develop preliminary design for the bridge’s retrofi tting and rehabilitation.

We conducted a detailed condition inspection of the bridge, which identifi ed the deck slab to be in poor condition. Preliminary designs were done for replacement of the deck slab and rehabilitation with an overlay system.

In addition, our project team investigated a number of traffi c safety improvements and prepared preliminary designs for installation of median and roadside barriers, and widening of the curve to the south approach.

We also completed analyses of the bridge which identifi ed numerous seismic defi ciencies, investigated seismic retrofi tting options, and recommended a base isolation retrofi t using pendulum bearings.

Non-linear true history analyses identifi ed a number of elements that would still require retrofi tting with base isolation, including crossheads, main pier columns and footings to the approach bents.