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.