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I-5 - SR 18 to S. 288th Street Seismic Retrofit Tool Illustrations

Bolster supports
Bolsters extend the crossbeams to reduce the possibility that the girders could fall.

Girder stops
Girder stops keep the girders from side-to-side slippage in an earthquake.

Steel column jackets
Steel column jackets help to keep support columns from crumbling and collapsing.