bracket & collar plate

Discussion in 'Metal Boat Building' started by Brian.Lin, Jun 21, 2016.

  1. Brian.Lin
    Joined: Aug 2006
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    Location: TW

    Brian.Lin Junior Member

    Dear sir,
    attached please find the frame section.(aluminum boat abt. 17M).
    the class add some brackets and collar plate on the long..
    I want to know more reason for the extra bracket and collar plate design.
    does any one have the books or documents about the issue?

    Attached Files:

  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    They prevent crack starting and structural crippling caused by the cutouts for the longitudinals. See Ship Structures Committee Report 331 (SSC-331) DESIGN GUIDE FOR SHIP STRUCTUAL DETAILS.
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