Thank you for all your suggestions,
We've considered shoring but since it is post-tensioned deck with tendon
profile optimally located for flexure, shoring will reverse the flexural
stress. Only other option was to completely shore the deck which is cost
I also considered movable container to spread the load but the contractor
wants to work with tools they have: forklifts They are rigging contractors.
Laura Watson's suggestion might work; removing all live loads and check with
influence line for moving loads to determine the maximum stress. For a given
bay of 16 feet by 5 feet wide (for a forklift), the overall deck capacity is
16x5x100psf = 8000 lb. which is less than the weight of a forklift (6000
lb.)+1/3 of 5200 lb.=7733 lb. As long as the front and the back forklifts
are not in the same bay, I think there may be chance to justify this.
Thank you for all your suggestions!
Brad Smith, SE
----- Original Message -----
From: Mark Ketchum <mark(--nospam--at)ketchum.org>
Sent: Friday, March 30, 2001 2:48 PM
Subject: Re: Parking deck
> If after all the best pencil sharpening, the calculations still don't
> "work", then try shoring the slab. A few strategicly located 4x4s, driven
> snug with wedges top or bottom, might just do the trick.
> Mark Ketchum - Berkeley, California
> >From: "Laura Watson" <lwatson(--nospam--at)alltel.net>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: Re: Parking deck
> >Date: Fri, 30 Mar 2001 17:24:04 -0500
> >Why not check the members with just the loads from the forklifts applied
> >lieu of 100 psf everywhere (and any other loads that will be present)?
> >is assuming that while this equipment is being moved no other loading on
> >the ramp is taking place. Also using influence lines for the moving loads
> >can help determine the most critical load positions.
> >Use the contact area of the forklift wheels and the axle loads to
> >how the loads are actually applied as the forklifts move down the ramp.