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RE: CALTran Loading combination

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Thanks Harold, I will get a copy of the AASHTO code.
I have always enjoyed your depth of knowledge.  Thanks
Samir
At 04:32 PM 7/12/2001 -0500, you wrote:
>
>Fire truck loading will be significantly higher than HS-20.  The normal fire
>truck axle and wheel loading will be within AASHTO HS 20 when it is
>traveling from point A to point B.  But when they set up and set the
>outriggers, all bets are off.
>
>The punching shear must be considered and will drive the thickness of the
>slab.  The outrigger loading on aerial platforms is huge.  The last time I
>checked Pierce, Seagrave, Sutphen, and E-1.  A Pierce aerial  had the
>largest outrigger loads at about 60,000 pounds (HS-20 wheel loads are 16,000
>pounds).  The only thing that NFPA says is that the outriggers are limited
>to 75 psi maximum bearing pressure under the outrigger.
>
>There is NOTHING in any code on this.  Fire apparatus manufactures are very
>tight lipped on maximum outrigger loading.
>
>Specifically to your question on distribution for HS 20.  The axle load is
>distributed across a 10' lane.  The wheel load is distributed over a width
>of 1 inch per ton of loaded weight.  You really need to get the AASHTO to
>see all of the permutations of load distribution.
>
>Regards,
>Harold O. Sprague
>
>> -----Original Message-----
>> From:	Samir Ghosn [SMTP:sghosn(--nospam--at)harris-assoc.com]
>> Sent:	Thursday, July 12, 2001 3:02 PM
>> To:	Seaint(--nospam--at)seaint.org
>> Subject:	CALTran Loading combination
>> 
>> Fellow engineers,
>> I have been asked to check a slab section subjected to HS-20 Loading.  I
>> don't have CalTran manual since I don't generally do this type of work.
>> Can some one point  me in the right direction as how to distribute the
>> wheel loading on  a one foot strip.  The slab will be formed and poured on
>> site, no post tension work.  This is only a segment that will support fire
>> truck or trash truck.  My assumptions are, since the UBC allows the wheel
>> load distribution on a specified area, there could be some thing parallel
>> to that.  Thanks in advance.
>> Samir y. Ghosn, P.E.
>> Harris & Associates
>> (800) 827-4900 XT 360
>> "sghosn(--nospam--at)harris-assoc.com"
>> Fax(949) 655-3995
>> 
>
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