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William C. Pegues, FCSI, CCS
Senior Member
Username: Wpegues

Post Number: 180
Registered: 10-2002
Posted on Tuesday, July 08, 2003 - 05:22 pm:   Edit PostDelete PostPrint Post

I am looking to see what different specifiers are referencing under their connection design for architectural precast for the safety factor.

Many may not list anything specific and just reference the standards from PCI which gets you basically 1.4. There is nothing wrong with this. I am just trying to find out if anyone is using something greater.

If any have access to some of the master systems, how they handle it would be of interest as well.

I am trying to track down a legacy issue here where we have carried a factor of 3 since the early 1980s and want to see what kind of concensus there is out there. No one has ever questioned it over the years until a recent project where a precaster who has done a lot of our projects over the years wants to know why we are doing this and wants to use the PCI standard factor (which goes to show I guess what he has actually been doing over the years now that he has finally noticed -grin!)

Thanks,

William
Gerard Sanchis (Unregistered Guest)
Unregistered guest
Posted on Saturday, July 12, 2003 - 07:02 pm:   Edit PostDelete PostPrint Post

William,

I asked a friend who's a curtainwall engineer and is response is "It varies depending on whether it is dead load, wind load, or seismic, and whether or not it is the body of the connection and/or a fastener. Generally, if it is and intermittent short term load the Safety Factor is 1.5-2.0 and higher on welds, screws, bolts etc."

This is what we use for seismic areas. I don't know if it would change for other areas of the country, but I doubt it.
William C. Pegues, FCSI, CCS
Senior Member
Username: Wpegues

Post Number: 184
Registered: 10-2002
Posted on Sunday, July 13, 2003 - 02:52 pm:   Edit PostDelete PostPrint Post

Gerard,

Thanks, that's basically what PCI has in the manual.

I wonder what some of the master systems include, or if they simply reference the requirements of PCI. Most input that I have gotten so far is that no additional safety factor is specified and only the PCI requirements are referenced.

William
Phil Kabza
Member
Username: Phil_kabza

Post Number: 6
Registered: 12-2002
Posted on Monday, July 14, 2003 - 07:53 pm:   Edit PostDelete PostPrint Post

Masterspec Section 03450 references PCI MNL 117 and PCI MNL 120, and does not otherwise reference a design safety factor in the section text nor the supporting documents. (I'm looking at a 1998 published section.)
William C. Pegues, FCSI, CCS
Senior Member
Username: Wpegues

Post Number: 186
Registered: 10-2002
Posted on Tuesday, July 15, 2003 - 10:28 am:   Edit PostDelete PostPrint Post

Thannks Phil, I was pretty sure that is what they would do since no one was coming up with anything different.

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