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Re: Precast Concrete Panel Cracking

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A few questions:

1.  Did the attachments to these trusses have an expansion end to allow for
creep + shrinkage + thermal movements, in both vertical and horizontal
directions?
2. Are the cracks parallel to the pretension, or perpendicular? I would
assume they are parallel to the PT because there is not much transverse
rebar in Spancrete.
3. When the panels were made, I am assuming it was on modified hollow core
equipment. If so, is this a modification that has been used before, or is
it the first time? If its the first time, could there have been a problem
with the extrusion process in the manufacture?

Michael Ludvik
Hardesty + Hanover
NYC



                                                                           
             "Chad Van Kampen"                                             
             <Chad@GeraceConst                                             
             ruction.com>                                               To 
                                       <seaint(--nospam--at)seaint.org>                 
             05/25/2004 09:33                                           cc 
             AM                                                            
                                                                   Subject 
                                       Precast Concrete Panel Cracking     
             Please respond to                                             
             <seaint(--nospam--at)seaint.or                                             
                    g>                                                     
                                                                           
                                                                           
                                                                           




The Panels that cracked have a steel truss connecting them however, the
trusses are running vertically while the panels run horizontally.  Does
this cause an additional problem?  This means that the trusses are running
perpendicular to the strand.


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