DETERMINATION OF STROUHAL CHARACTERISTICS AND POWER SPECTRUM FOR ELASTICALLY RESTRAINED H-SHAPE SECTIONS

This document provides results of experimental investigation of Strouhal numbers and power spectral density of H-shaped members. The aspect ratios of the cross-sections of the members examined were approximately 1:1, 3:4 and 1:2, respectively. The specimens were sharp-cornered and mounted on adjustable springs at the ends. The tests were conducted in a wind tunnel having minimum upstream turbulence. The Reynolds number ranged from 1 x 10 to the 5th power to 1.7 x 10 to the 6th power. The results showed that the Strouhal number was 0.12 for sections having a high aspect ratio, but indicated a markedly decreasing trend for those having lower aspect ratios. The power spectra had narrow-bands indicating that subcritical flow prevailed during the tests. There was no evidence of a transition zone which would indicate a random shedding regime. This document is the second in a series of reports discussing the structural dynamics of long slender members of contemporary cross-section shapes. The first report entitled: "Response of Bridge Structural Members Under Wind-Induced Excitation" presents a state-of-the-art discussion and an extensive bibliography of this subject area. /FHWA/

  • Supplemental Notes:
    • This report was sponsored by DOT, Federal Highway Administration.
  • Corporate Authors:

    Chi Associates Incorporated

    Arlington, VA  United States 
  • Authors:
    • Chi, M
    • Neal, E
    • Dennis Jr, B G
  • Publication Date: 1977-8

Media Info

  • Pagination: 81 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00182555
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-78- 26 Final Rpt., FCP 35A1-062
  • Contract Numbers: DOT-FH-11-9146
  • Files: TRIS, USDOT
  • Created Date: Dec 12 1978 12:00AM