New Steel Frame - clearance
New Steel Frame - clearance
(OP)
We are designing a supplementary support frame to an existing concrete girder in a parking garage.
The new supplementary support is a steel frame of HSS 12x12 members forming an arch comprising an inclined member at the left end, a horizontal member at the top, and an inclined member at the right end. This will be installed at the centreline of the central beam running the north-south length of the garage. This central beam spans 13 m and supports the east-west beams that span the 17 m width of the garage each side of the central girder. This new frame will be at the back of the parking stalls. The parking is "angled" parking only. We are going to pour a concrete sidewalk on the floor directly below the new frame (taking care to use styrofoam to lighten the sidealk and not overload the floor)to prevent cars from impacting the new steel frame when they drive into the stalls. Due to the angled parking, they drive in only, they do not back in. Question: Does anyone know how wide the sidewalk should be to prevent vehicles from impacting the steel when they drive into the angled parking stall? Please do not guess at the answer. We can guess too (it might be based on the distance to the front wheel or it might only have to be to the distance to the shroud below the chasis at the front of the vehicle, but in either case I don't know if there are measuremnts for this that should be used for such situations).
The new supplementary support is a steel frame of HSS 12x12 members forming an arch comprising an inclined member at the left end, a horizontal member at the top, and an inclined member at the right end. This will be installed at the centreline of the central beam running the north-south length of the garage. This central beam spans 13 m and supports the east-west beams that span the 17 m width of the garage each side of the central girder. This new frame will be at the back of the parking stalls. The parking is "angled" parking only. We are going to pour a concrete sidewalk on the floor directly below the new frame (taking care to use styrofoam to lighten the sidealk and not overload the floor)to prevent cars from impacting the new steel frame when they drive into the stalls. Due to the angled parking, they drive in only, they do not back in. Question: Does anyone know how wide the sidewalk should be to prevent vehicles from impacting the steel when they drive into the angled parking stall? Please do not guess at the answer. We can guess too (it might be based on the distance to the front wheel or it might only have to be to the distance to the shroud below the chasis at the front of the vehicle, but in either case I don't know if there are measuremnts for this that should be used for such situations).






RE: New Steel Frame - clearance
RE: New Steel Frame - clearance
The beam is prestressed and a number of tendons have failed due to corrosion. To demolsih and recast the 40 foot span prestressed beaam which supports other prestressed beams spanning 56 feet is neither practical, as you can well imagine. Neither were any of the other solutions (such as but not limited to carbon fibre; external p.t., etc,) that we investigated over an extensive period.
Does anyone know the answer to the question that was asked?
RE: New Steel Frame - clearance
Rather than go with a walkway, you could save weight by just using a parking stop the same height as you walkway.