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  • 1.  Travelling cranes

    Posted 08-28-2017 06:31 PM

    regards

    I am a student of the tenth semester of civil engineering. I was commissioned to do the structural design of a laboratory, which must have a traveling crane with a capacity of 3 tons.

    It has a length of 7 m, a working width of 7.5 m and a lifting height of 7 m.

    How can I calculate the loads generated by the operation of the traveling crane on the structure? What factors should I consider for the design of the steel frame and brackets?

    Thank you very much in advance



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    Christopher Delgado S.M.ASCE
    Cartago
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  • 2.  RE: Travelling cranes

    Posted 08-29-2017 09:27 AM
    Hey Mr. Delgado

    The crane calculation (the crane itself) is on vendor and you just have to assign the loads to the structure. You can consider the loads as whether point or moving. Considering moving loads is a little complicated and differs in various computer softwares. I recommend you to assign the loads as point forces equal 3 tones on each brackets. You need to consider a positive and negative direction to assign the loads on the structure.

    I hope this could help

    regards,



    Original Message


  • 3.  RE: Travelling cranes

    Posted 08-29-2017 09:27 AM
    This design must be done by or under the supervision of a registered engineer.  Identify that individual and ask for guidance.

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    Mark Gilligan P.E., M.ASCE
    Principal
    Berkeley CA
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    Original Message


  • 4.  RE: Travelling cranes

    Posted 08-29-2017 05:55 PM
    Christopher, I would add to the good suggestions noted above to read and look over the AISC Steel Design Guide 7, Industrial Buildings, Part 2, Sections 11 to 24 that contains most of what you will need for your commissioned project task. Also, look at AISC Steel Design Manual ASD, 9th Edition or AISC LRFD latest Edition for the coefficients of longitudinal and transverse forces and Impact factors from Crane. Keep in mind Deflection limits of L/600 for vertical loads and L/400 for horizontal loads.

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    Pedro Munoz Ph.D., P.E., M.ASCE
    Principal
    PRM Engineering, LLC
    Methuen MA
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    Original Message


  • 5.  RE: Travelling cranes

    Posted 08-29-2017 09:27 AM
    Christopher, thanks for your question.

    I would suggest reviewing AIST TR-13 Guide for the Design and Construction of Mill Buildings.  It is one of the best resources for design building considerations related to cranes.  It provides suggested design loads, service criteria, and suggested load combinations.  You might be able to find a version for reference from a local university library or I would also suggest that if you have already selected a crane supplier they might have copies for customer use.



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    Timothy Gilbert P.E., S.E., M.ASCE
    Project Specialist - Civil
    Wadsworth OH
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    Original Message


  • 6.  RE: Travelling cranes

    Posted 08-29-2017 09:27 AM
    ​As cranes mostly operate in a stationary position the idea to be to find the most onerous position of the crane to operate (lift) for worst case vertical load on the carrying frame. In regards to lateral load, if inside a laboratory the only concern is maximum braking forces which you should be able to get from a catalog cut of a crane manufacturer. Look up a manufacturer for a crane with the vertical load carrying capacity you need (5 T, 10 T) and call the up pr visit the website to get technical information.

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    Hashim Muhammad-Graham P.E., M.ASCE
    Struct Engineer III
    Brooklyn NY
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    Original Message


  • 7.  RE: Travelling cranes

    Posted 08-29-2017 12:12 PM
    ASCE 7 has a section for crane loads in Chapter 4, Section 4.10.  That's what I used when I've designed crane supports.

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    Robert Kuhn P.E., S.E., M.ASCE
    MNGR DESIGN ENG
    Vulcan Materials Co
    Glendale CA
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    Original Message


  • 8.  RE: Travelling cranes

    Posted 08-30-2017 12:47 PM
    All the references mentioned so far are certainly useful.  I would caution that the AIST Tech Rpt 13 document mentioned is more conservative than is used in 90+% of structures supporting industrial cranes.  Instead, one should consider using the Metal Building Systems Manual (MBSM), Chapter 3, published by the Metal Building Manufacturers Association as a definitive and complete guide to designing structural steel to support a standard industrial crane.  You can find that manual here:  Metal Building Systems Manual | MBMA: In Partnership with Techstreet
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    Scott Russell S.E., P.E., M.ASCE
    Manager - Group Technical Services
    Vulcraft/Verco Group - Nucor Corporation
    Norfolk NE
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    Original Message


  • 9.  RE: Travelling cranes

    Posted 08-31-2017 02:50 PM
    ​I would recommend that you obtain a copy of the Crane Manufacturers Association of America (CMAA) Specification #70, Specification for Top Running Bridge & Gantry Type Multiple Girder Electric Overhead Travelling Cranes. (CMAA is a division of the Material Handling Institute (MHI). It publishes several specifications for the design of various types of cranes and gantries, all regularly reviewed by manufacturers, electrical engineers, mechanical engineers, structural engineers and OSHA.)
    Those specifications provide thorough background reasoning and mathematical derivations for the design requirements that you will find useful.You can obtain copies of those specifications on line.

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    Robert Crossno P.E., M.ASCE
    Structural Engineer, Civil Engineer
    Albuquerque NM
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    Original Message


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