Client: British Columbia Ministry of Transportation

Location: Mission, British Columbia

Connecting the District of Mission to the City of Abbotsford, the Mission Bridge has become a vital link for commuter traffic in the Lower Mainland. The main crossing of the Mission Bridge features variable profile steel box girders and signature V-shaped piers with spans of 88m, 134 m and 88m. Klohn Crippen Berger Ltd. provided complete engineering services for this bridge (completed in 1973) including: preliminary investigations, detailed design work, construction inspection and contract.

In 2000 Klohn Crippen Berger Ltd. teamed with Brybil Projects and T.Y. Lin International to develop a comprehensive rehabilitation and seismic retrofit design. Klohn Crippen Berger Ltd. completed the 3-dimensional site response analysis, liquefaction assessment, and ground displacement analysis. Various ground improvement techniques were evaluated, and the vibro-compaction liquefaction mitigation was designed.

Klohn Crippen Berger Ltd. also preformed a comprehensive condition assessment of the concrete girder approaches and designed the concrete rehabilitation measures. A seismic assessment of the concrete approach piers was completed using a non-linear pushover analysis. Klohn Crippen Berger Ltd. designed the retrofit strengthening measures for the piers which included the concrete underlays for the capbeams, fibre-wrap strengthening for the columns and pile cap footing overlays.

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