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RE: Below-Ground Vault or Wet-Well for Fire Water Storage

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There is a 250psf uniform and 8000# concentrated load in the ASCE 7 live 
load table for "sidewalks, vehicular driveways, and yards subject to 
trucking" that I suppose one could use.


Senior Program Manager
Construction, Codes & Standards

D 202 266 8545  M 240 355 5011
F 202 266 8369  T 800 368 5242 x8545

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Polhemus, William Sent: Monday, February 24, 2014 9:02 PM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Below-Ground Vault or Wet-Well for Fire Water 

I've always found it interesting that "highway loading" is do often 
specified for structures like this.

If you've done any bridge design, you realize that the highway truck 
loading is highly generalized and takes into account a whole slew of things 
 that an occasionally-loaded structure never will see, meant to represent a 
 high incidence of overloaded large trucks traveling at highway speeds.

It's convenient to use because everyone thinks "oh, yeah, trucks," but the 
HS and HL (used since mid-90s) type loadings are NOTIONAL LOADS and mostly 
overkill for small-area and small-instance-of-load situations.

It would be great if someone came up  with a loading alternative for "stuff 
 on the ground that things roll over" but I'm not holding my breath.

William L. Polhemus, Jr. P.E.


> On Feb 24, 2014, at 5:57 PM, "Lloyd" <lloyd(--nospam--at)>

Truncated 808 characters in the previous message to save energy.

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