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  1. DurableEfficientGood

    Why were Older Bridges Commonly Built so Low to the Water?

    Why were so many pre-1970 bridges built so low to the water that they do not even allow a single-level stand-up boat (serving as water buses or small fishing/research vessels) to pass underneath without raising or swinging the span? If they're built so low with short spans anyway, why not make...
  2. DurableEfficientGood

    Will triple bunk beds cause a bedroom floor to collapse?

    The main thing I want to know is whether heavy-duty tri-level bunk beds will overload the floor. There is currently a severe housing shortage in a not-insignificant part of the country and worldwide. Let's say in a hypothetical (and slightly somewhat realistic) scenario that the housing...
  3. DurableEfficientGood

    Would exceeding the snow load duration factor practically guarantee a collapse?

    The snow load duration factor is 1.15 times the standard 10-year sustained maximum load rating as long as the accumulated time under this load is not more than 2 months. Does this mean that 1. a. the snow load being at the duration factor of 1.15 for 2 months continuously (experimental...
  4. DurableEfficientGood

    Airliner Rollaway Gradient

    The FAA limits airport aprons (parking areas) to 1% maximum in any direction for aircraft approach categories C, D, and E (all jet airliners). What is the exact gradient in which aircraft of the following categories start rolling with all engines off and all brakes released in the absense of...
  5. DurableEfficientGood

    Vehicle Rollaway Gradient

    At what exact gradient does a typical vehicle in the following classes start to roll away when the brakes are released and the transmission is in neutral? I'm trying to design a super-safe parking lot/garage in which vehicles won't start rolling even with all brakes released and the transmission...
  6. DurableEfficientGood

    Maximum Slope for Heavy-Duty Vehicle Parking Lot

    What is the maximum grade/gradient allowed for non-temporary (overnight or longer) parking/vehicle storage areas in parking lots for heavy-duty vehicles such as semi-trucks and buses? All I could find is that the International Building Code allows a maximum gradient of 1:15 (6 2/3% grade) in...
  7. DurableEfficientGood

    Maximum Slope for Truck Parking Lot

    What is the maximum grade/gradient allowed for non-temporary (overnight or longer) parking/vehicle storage areas in parking lots for heavy-duty vehicles such as semi-trucks and buses? All I could find is that the International Building Code allows a maximum gradient of 1:15 (6 2/3% grade) in...
  8. DurableEfficientGood

    Maximum Slope of Truck Parking Lot

    What is the maximum grade/gradient allowed for non-temporary (overnight or longer) parking/vehicle storage areas in parking lots for heavy-duty vehicles such as semi-trucks and buses? All I could find is that the International Building Code allows a maximum gradient of 1:15 (6 2/3% grade) in...

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