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| Re: The reason NYC stopped building subways (1537579) | |||
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Re: The reason NYC stopped building subways |
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Posted by Stephen Bauman on Fri Feb 7 22:50:45 2020, in response to Re: The reason NYC stopped building subways, posted by Fisk Ave Jim on Fri Feb 7 19:09:41 2020. The weight issue would be the combination of both subway trains and the dozens of fully loaded ( and possibly overweight) tractor trailers that would be using the bridge. It would be one or the other.Ammann used probability to build bridges that could not carry a load, if the bridge were bumper to bumper vehicles that did not exceed their legal weight limit. He reasoned such events were unlikely. This allowed him to design bridges that came in under budget. The live load capacity for the VZ is 4800 lb per linear foot. A 53 foot long trailer can legally carry 80,000 lbs. Add a cab for a 70 foot length. That's 1143 lb/linear foot. The VZ has 12 traffic lanes (actually 13 now). |
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