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Bridge Live Load Distribution

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I need to evaluate a bridge to determine if a large track hoe can safely cross
without having to be put on a truck.  I have the track hoe weight and ground
contact area.  How do I distribute the live load in order to analyse the deck
and girders?  All my references deal with distributing wheel and axle loads, not
loads from tracked vehicles.  Can any one point me in the right direction?

Kipp A. Martin, S. E.
Portland, Oregon