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Re: How Can Force in "All Thread" be Det[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: 73527.1356(--nospam--at)compuserve.com, seaint(--nospam--at)seaint.org
- Subject: Re: How Can Force in "All Thread" be Det
- From: GSKWY(--nospam--at)aol.com
- Date: Thu, 11 Oct 2001 13:59:00 EDT
Out of curiosity, what are you calling a strand chuck? As in the statement below:
"Use strand chucks to anchor the strands --- don't use wedges."
Strand chucks are multi-use chucks (with wedges) that are used to anchor pre-tensioning strand against the bulkheads. They are also used to do things like pull out strand in repairs, to anchor strand for testing, etc. About the only way to anchor a strand without using wedges is a compression fitting, also referred to as a mechanically attached anchor or a swedge.
You also should probably be clear on what you are specifying and/or the contractor is proposing for bar. Williams `All-Thread-Bar' is in fact a 150 ksi prestressing bar, so is the Dywidag `Threadbar'.
Note also that prestressing bar (ASTM A722) is not low-relaxation, it is stress-relieved. The relaxation is much higher than low-relaxation strand. If the bars are stressed to 0.8fpu, 0.6fpu is tyipcally used as the final effective stress in concrete I think it would be lower when prestressing wood though.
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