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    Kevin Griendling

    Hi Aleksander,

     

    Neither Building Construction Illustrated nor Fundamentals of Building Construction; Materials and Methods makes any mention of why the double tee span is shorter.

    They both, however, do callout the fact that the double tee design is newer and is the preferred design to use since it does not require extra support from tipping during erection. It is a more efficient design for the process of construction.

    If I could take a guess I would assume the weight of the extra concrete in a double tee in the near the neutral zone of the member (non-structural action) would be the cause of its lower span capability.

     

    Hope this helps,

     

    Kevin Griendling, AIA

    http://xQ.intersectartsstudio.com 

    http://www.pluralsight.com 

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    Matthew Cooper

    I had that same thought about why double-tees carried less until I noticed that the depth of the single tees ranges from 20" - 48", whereas the doubles only get up to 32" in depth. 

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    Tyrone Bunyon

    To second what Matthew Cooper said, in Karen's Notes,  Double Tees have a shorter beam depth than Single Tees making them more rigid and able to carry larger loads.

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