Volume 27, Issue 4 (July 1999)

    A New Dynamic Wind Load Cycle to Evaluate Mechanically Attached Flexible Membrane Roofs

    (Received 3 September 1998; accepted 26 April 1999)

    CODEN: JTEOAD

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    Abstract

    In North America, at present, no test procedure exists for certifying roofing systems under dynamic wind loads. To develop such a dynamic test procedure, the National Research Council of Canada (NRC) formed an industry-based consortium during 1994. The consortium is known as the Special Interest Group for Dynamic Evaluation of Roofing Systems (SIGDERS). This paper reports SIGDERS' progress on dynamicload cycle development. Wind tunnel investigations were carried out using two flexible roofing membranes: poly(vinyl chloride) (PVC) and ethylene propylene diene monomer (EPDM). Using the wind tunnel pressure records as source data and comparing the membrane responses of PVC with EPDM, SIGDERS developed a dynamic load cycle. With input from industries, building owners, and roofing associations, the developed load cycle has been generalized and extended to evaluate the ultimate strength of flexible membrane roofs. To validate the newly developed load cycle, several membrane roofing systems were investigated and then reported separately. The SIGDERS load cycle in a laboratory mimics failure modes similar to those observed in the field.


    Author Information:

    Baskaran, A
    Research officer, Institute for Research in Construction, National Research Council of Canada, Ottawa, Ontario

    Chen, Y
    Institute for Research in Construction, National Research Council of Canada, Ottawa, Ontario

    Vilaipornsawai, U
    Institute for Research in Construction, National Research Council of Canada, Ottawa, Ontario


    Stock #: JTE12223J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12223J

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    Author
    Title A New Dynamic Wind Load Cycle to Evaluate Mechanically Attached Flexible Membrane Roofs
    Symposium , 0000-00-00
    Committee D08