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Re: Friction Coonection for Seismic Loads

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Google "OPA-0114", this is the OSHPD preapproval for the B-line system, 
pages 49-54 will give you what OSHPD allows as acceptable hanger rod 
attachments for vertical loads (this may have a seismic vertical 
component), for any "brace" connection you will need to provide a 
mechanical attachment to the deck or the steel, typically designed by the 
SEOR.  There are some basic examples in the OPA but nothing that isn't 

If it is not an OSHPD or DSA project you may be able to get creative and 
justify that the clamps can resist lateral load applied directly 
perpendicular to the beams for some of these clamping systems.  Any load 
parallel to the beam direction would be friction dependent and prohibited 
by the CBC.

Donny Harris, SE
Los Angeles

> Date: Tue, 14 Jan 2014 14:21:51 -0800
> From: nma <nma(--nospam--at)>
> Subject: Re: Friction Coonection for Seismic Loads
> Check with the approvals from OSHPD for just these kind of connections.
> We did something like this at a high school a few years ago.
> Neil
> n 1/14/2014 1:44 PM, lrhauer(--nospam--at) wrote:
>> To All,
>> I am providing some vertical water pipe supports where we would like to
>> use "Beam Clamps" to the bottom flange of an existing wide flange beam,
>> (in a building). Even though they are rated by "B-Line" for a maximum
>> horizontal force, it appears they rely on friction only and I vaguely
>> remember friction connections not being allowed for seismic
>> applications.
>> Any thoughts, or can someone direct me to the IBC/CBC or ASCE section

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