How much will this Bridge Move?

jeff-wright · 2011-04-29T01:47:05Z

I'm starting a project that has a bridge on one side of it. I would really like to set grid control on the bridge because it won't be disturbed by the construction and it would afford obstruction-free views of the whole job. However, I'm concered that the bridge may move. When I'm standing on it, If a bus drives over it,I can feel it bounce slightly up and down. It's not enough to make my total station go out of level. It is a concrete girder bridge, with expansion joints.How much should should I expect this bridge to move horizontally, it at all?As an experiment, I'll set some control on it, with good ties beyond the bridge. That way when I set up on it at different times, I can get a good feel for how much it may be moving.Thanks,Jeff

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Strictly Surveying

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Steve Boon

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The use of Smooots in bridge measurement is illegal, except in Massachusetts.

Even discussing the subject here is ethically questionable, and could lead to an investigation by your professional board.

Posted : April 30, 2011 9:44 pm

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How much will this Bridge Move?

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