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Re: Live load / occupancy correlation

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This comment reminded me about going to the Golden Gate Bridge's "birthday party" a few years ago.  A million or so people were packed together so tightly that there was *nothing* any of us could do to resist any "mob movement" that might have occurred.  Fortunately none did.  I vaguely recall reading later that the powers that be stated that the crowd load was "safe," or something like that.  Of course a bridge's design live load is somewhat larger than that of my living room floor.  :)

When they were replacing the G. G. Bridge's deck with a lighter one some time ago (completely at night, without interrupting rush hour traffic, by the way) the distortion in the bridge due to one part of the deck being significantly heavier than the other was quite noticeable. 

Ralph Hueston Kratz, S.E.
Structural Engineer

Fax 510-215-2430

724 McLaughlin Street
Richmond CA 94805-1402 USA

In a message dated 10/26/04 12:40:00 PM, writes:
On a related topic, I have heard a story (I believe it's true) that a
marathon was started at the Golden Gate bridge.  Someone had the
foresight to mount a camera high up on one of the towers, pointing down,
which took pictures of the crowd.  The runners were crowded pretty
tightly together at the start.  The weight was so large that the curve
of the bridge deck was noticeably flattened.  When the photos were
studied and an estimate made of the weight of the runners, it was
several times the design load of the bridge.