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Code from the way back is vague...</div>
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https://ia904608.us.archive.org/28/items/standardbuilding00unse/standardbuilding00unse.pdf</div>
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Section 4-14 (pdf page 14) covers places of assembly.</div>
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Any idea who built the system? If the company is still around they may have an archive that would have the stamped engineering drawings. That would be the definitive way to know if the bridge was designed adequately in the first place (but you know its at least
close, since it is still there after all these years).</div>
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Beyond that, 20psf sounds like a typo, but the cure will probably be bringing in an engineer (and the first thing they will ask for are the stamped drawings).</div>
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I can respect that you don't want to share your clients name and location, but if you can send pics of the arbors, locks, and blocks the 'elder experts' can probably tell you who made it.</div>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Tyler Smith</b></span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">(he/him)</span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">Performing and Fine Arts TD/PM</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stagecraft <stagecraft-bounces@theatrical.net> on behalf of stagecraft-request@theatrical.net <stagecraft-request@theatrical.net><br>
<b>Sent:</b> Wednesday, June 4, 2025 5:00 AM<br>
<b>To:</b> stagecraft@theatrical.net <stagecraft@theatrical.net><br>
<b>Subject:</b> Stagecraft Digest, Vol 130, Issue 3</font>
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Today's Topics:<br>
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1. Re: Loading Bridge design... (Matthew Breton)<br>
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----------------------------------------------------------------------<br>
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Message: 1<br>
Date: Tue, 3 Jun 2025 15:21:43 +0000<br>
From: Matthew Breton <theatricalmatt@hotmail.com><br>
To: "stagecraft@theatrical.net" <stagecraft@theatrical.net><br>
Cc: Will Leonard <will@istudioprojects.com><br>
Subject: Re: [SML] Loading Bridge design...<br>
Message-ID:<br>
<DM4PR20MB57513F92AF08682EA3783825DA6DA@DM4PR20MB5751.namprd20.prod.outlook.com><br>
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Maybe the difference is between what they feel is required by code (ie, the minimum permissible) versus the actual load it needs to support? 20psf seems ridiculously low, especially when a loading gallery for a theater is likely to be holding around 10 tons
of counterweight.<br>
<br>
Given the dimensions of a steel counterweight (6" x 13" x 2") ? two across and two high would be somewhere around 200 lbs/s.f., no? (Plus two burly stagehands....)<br>
<br>
<br>
Matthew Breton | he, him, his<br>
Design for Theater and Dance<br>
________________________________<br>
From: Stagecraft <stagecraft-bounces@theatrical.net> on behalf of Will Leonard via Stagecraft <stagecraft@theatrical.net><br>
Sent: Monday, June 2, 2025 11:10 AM<br>
To: stagecraft@theatrical.net <stagecraft@theatrical.net><br>
Cc: Will Leonard <will@istudioprojects.com><br>
Subject: [SML] Loading Bridge design...<br>
<br>
Howdy,<br>
<br>
We are doing an install on a building that was built in 1976 & I need some information from the experts on the List:<br>
<br>
With this project, we are having to work with an Architectural Firm who has no theater experience. We are having to explain to them how things are actually work/are used, which is not a problem because this is very common as we deal with remodels, etc.<br>
<br>
However, they are trying to tell us that the loading bridge is only designed for a Live Load of 20psf. This means that 1- we cannot build a scaffolding to reinforce the head steel (as they are requiring) but also that 2- the bridge cannot have the stage weights
stacked on it as it was (& has been since the building first opened).<br>
<br>
What I am looking for is if someone can quote (or direct me to where I can find) documentation that the building codes of the 1970s required Live Load ratings (150 psf? like the stage floor). I don't want the client to not be able to use their newly installed
counterweight system because of incorrect information, so I reach out to the group to see if I am crazy.<br>
<br>
Let me know what you think (dangerous request I know) ;)<br>
- Will Leonard<br>
Design Manager<br>
C: 281-752-1060<br>
<br>
<br>
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Subject: Digest Footer<br>
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End of Stagecraft Digest, Vol 130, Issue 3<br>
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