LETTERS Disagreementwith PT
Editor, ParkingToday: Re: “Temperature can affect upper floors of precast
garages” (March 2009) The aspect of camber increasing in the top level of park-
ing structures because of the sun’s heating is hardly a new top- ic, and it exists in all parking structures regardless of the con- structionmaterial. The problems described by the authors are rare in well-
designed precast parking structures. Indeed, in over 300 park- ing structures that I have designed or built, I have yet to experi- ence such problems. While the solutions presented by the authors may work,
they are expensive and needless in properly detailed and designed precast structures. The authors also fail to recognize thatwithout a proper bearing pad, theCazaly hanger can create beam-edge spalling. Two typical details will provide the rotation needed at the
end of the double tees to prevent damage to the tees and beams. The first is the application of a good quality 3/8” thick
Masticord or equal bearing pad under the tee
bearing.This pad will allow rotation and movement of the double tee end bear- ing without cracking or spalling of the beamor tee. The second is the well-known warning not to weld both
ends of the double tee at its bearing. Such a rigid connection will lead to damage to both the tee and the beam. Parking structures are exposed to the full range of temper-
atures, and therefore must be allowed to “breathe” or move with temperature extremes. Paying attention to correct detailing will eliminate any
concern for sun camber effect and will not require expensive repairs or secondary strengthening. However, when poor detailing is employed or careless erection happens, damages to beams or tees can occur. CFRP wraps, epoxy injection or stem strengthening can be an effective remedy.
Respectfully submitted, Thomas J. D’Arcy, P.E.S.E.
Disagrees on SF Parking
Editor, ParkingToday: I greatly appreciate Parking Today’s efforts to promote
market-rate parking. However, I disagree with your objections to using parking fees to fund transit. I think that this truly is a use that helps drivers and the San Francisco commercial dis- tricts, just like Professor Shoup recommends. If San Francisco did not have a transit system that works, most drivers couldn’t drive anywhere close to where they want go. I also suggest that San Francisco parking garage opera-
tors should see that the parking tax actually helps them by nearly eliminating the construction of competing garages. The tax, though used to fund transit, actually maximizes the profits of private garage owners. San Francisco’s mistake rel- ative to garage owners was to build too many publicly subsi- dized garages.
Howard Strassner San Francisco
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