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Wind and Structures
  Volume 5, Number 1, January 2002, pages 49-60
DOI: http://dx.doi.org/10.12989/was.2002.5.1.049
 


Wind-induced dynamic response and its load estimation for structural frames of circular flat roofs with lond span
Yasushi Uematsu and Motohiko Yamada(Japan)

 
Abstract
    This paper describes a simple method for evaluating the design wind loads for the structuralrnframes of circular flat roofs with long spans. The dynamic response of several roof models werernnumerically analyzed in the time domain as well as in the frequency domain by using wind pressure datarnobtained from a wind tunnel experiment. The instantaneous displacement and bending moment of the roofrnwere computed, and the maximum load effects were evaluated. The results indicate that the wind-inducedrnoscillation of the roof is generally dominated by the first mode and the gust effect factor approach can bernapplied to the evaluation of the maximum load effects. That is, the design wind load can be representedrnby the time-averaged wind pressure multiplied by the gust effect factor for the first mode. Based on thernexperimental results for the first modal force, an empirical formula for the gust effect factor is provided asrna function of the geometric and structural parameters of the roof and the turbulence intensity of thernapproach flow. The equivalent design pressure coefficients, which reproduce the maximum load effects,rnare also discussed. A simplified model of the pressure coefficient distribution is presented.
 
Key Words
    circular flat roof; wind-induced response; structural frame; load estimation; design wind load; gust effect factor.
 
Address
Yasushi Uematsu, Department of Architecture and Building Science, Tohoku University, Sendai, JapanrnMotohiko Yamada, New Industry Creation Hatchery Center, Tohoku University, Sendai, Japan
 

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