Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

1980s PT Systems

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Does anyone have any wisdom to share about 1980s PT systems?  In visiting a friend recently, I went to look at an existing PT garage upgrade he is working on.  There is some cracking in a column at the roof, right at the ramp where beams frame in a different elevations.  The beams just miss each other - the top of one is a few inches below the bottom of the other.  He believes, probably correctly, that concrete/PT related shrinkage pulled the beams on the two sides of the columns, and caused shear cracking in the column and to an extent running into the beams.  While this scenario seems likely, I noted some grease leaching out of one of the cracks in the beam.  There is also some grease leaching out of the places where the PT pockets were grouted.  Being used to modern encapsulated systems, this worries me quite a bit.  Older systems, however, can be different and perhaps this is not quite as bad as I suspect.  Does anyone have any experience with this kind of behavior on older systems?  I hate to tell my friend that the problem is worse than he believes, but I suspect it might be.  

Paul Crocker, PE, SE

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********