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Re: Moving Walkway Seismic Restraint[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Moving Walkway Seismic Restraint
- From: Daniel Popp <drp181(--nospam--at)yahoo.com>
- Date: Tue, 12 Feb 2008 09:56:02 -0800 (PST)
Thanks for your response. The manufacturer is designing the anchorage; however, they are designing it for no lateral force. Their "anchorage" consists of a stack of steel shims and a wood block. They do know that we are in a fairly high seismic zone, but insist that their structure floats. Which of course it will, until it collides with our structure. Then we will have a 50 kip force (plus impact) at unknown locations.
The latest development: we have asked that their letter be stamped by a structural engineer with a local license. They are refusing.
Any thoughts are appreciated. We will be preparing a summary of the IBC/ASCE 7 requirements to demonstrate the magnitude of the forces involved, although this may not help.
From: Benjamin Maxwell <enginerd666(--nospam--at)yahoo.com>
Sent: Monday, February 11, 2008 7:34:45 PM
Subject: Re: Moving Walkway Seismic Restraint
Daniel Popp <drp181(--nospam--at)yahoo.com> wrote:
A current project of ours incorporates a moving walkway on a pedestrian bridge. The project is at the high end of Seismic Design Category C and thus seismic forces are substantial. However, the moving walkway manufacturer insists that the walkway will impart no lateral load to our supporting steel structure. They are willing to put this in writing, but I am not comfortable with a 63,000 pound piece of equipment sitting on my structure without a defined seismic load path. Calculations using the non-building sections of ASCE 7 indicate lateral forces on the order of 50 kips, which is quite different from zero.
Does anyone have any experience with moving walkway installations? I am particularly interested to know if anyone has received horizontal (seismic) reactions for such a walkway, particularly in California or other high-seismic areas. Any suggestions on how to extract this information from the manufacturer would also be appreciated.
Daniel R Popp, S.E.
Benjamin H. Maxwell, S.E.
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