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RE: Vibration Problem

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I am kinda doubting the vibration cause.  How old is the house?  How long is
the rear of the house?  Is the cracking vertical or horizontal?  Is it at
the corners?  Is it at windows or doors?  How wide are the cracks?  Are
there any clues inside the house like cracks or separations at corners of
floors, ceilings, walls, windows, and doors?

The CMU units can shrink over a long wall length.  The soil may be OK, but
was not compacted real well and had differential settlement.  Is the any
cracking in the slab or sides of the footings?  Is the wall pushed out from
the top of the wall compared to the bottom?  Is the roof system joists and
rafters or trusses?  Sometimes the joists don't get tied back and the roof
causes an outward thrust?  Just some thoughts.

Glenn C. Otto, PE
Virginia Beach, VA

		 -----Original Message-----
		From: 	David Compton [mailto:dcompton(--nospam--at)]
		Sent:	Thursday, January 24, 2002 7:48 PM
		To:	Seaoc List
		Subject:	Vibration Problem

		Hi All,

		I could use some help.  I am investigating a single family
home in Florida constructed of masonry block with monolithic slab-on-grade.
The structure has cracking of the block along the rear of the home.  Hand
Augurs, SPT Borings, GPR all show nothing. I am at a loss for a cause,
expect for a long shot.  Around the time the cracks started showing up, some
heavy construction (I believe earth work) was going on about 200' to 300' to
the rear of the structure.  No vibration monitoring was conducted at the
time of the construction.  Is it possible that the construction could of
caused the cracking, and is there any reading material available on the
subject that might help me. Thanks in advance.

		David L Compton, PE
		Urbaneering, Inc.
		Civil Engineering & Inspection Services
		Office 813-948-8360
		Cell 813-766-7649

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