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RE: Water Bag Load Testing[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Water Bag Load Testing
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Mon, 17 Nov 2008 18:26:07 +0000
Wear a brightly colored hard hat which says "Dig Here!!" on the top.
Regards, Harold Sprague
Subject: RE: Water Bag Load Testing
Date: Mon, 17 Nov 2008 09:13:22 -0800
And don't stand underneath when test loading.
I test loaded a railroad flat car bridge over a creek using a fully loaded gravel truck. I was under the bridge with a level to read the defllection (and to prove I believed in my design so much that I was unafraid to be under it when loading - a level of confidence that every structural engineer must have or at least convince others that he has). With much creaking and groaning of the bridge, the gravel truck approached the critical loading position. I measured the deflection, which of course kept increasing up to that final truck position. The truck driver halted at the pre-arranged location and let off his air brakes with that big SCREECH-WHOOSH. After I regained my composure, I stepped out from under the bridge and kept my backside away from everbody so they couldn't see I messed my pants.
Bob Garner, S.E.
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Please do not forget shoring for safety especially if you suspect a shear failure. The shoring is also a good place to mount gauges. The smaller the gap the smaller any impact. Bending is not generally as much of a potential catastrophic failure, but calculate anticipated deflections. If the deflections go off the chart, something is wrong and the test should be terminated.
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