國立虎尾科技大學 |

New identification methods applied to the response of flexible bridges to wind.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	New identification methods applied to the response of flexible bridges to wind./
作者:	Sarkar, Partha Pratim.
面頁冊數:	1 online resource (256 pages)
附註:	Source: Dissertations Abstracts International, Volume: 54-11, Section: B.
Contained By:	Dissertations Abstracts International54-11B.
標題:	Civil engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798207846415

New identification methods applied to the response of flexible bridges to wind.
Sarkar, Partha Pratim.

New identification methods applied to the response of flexible bridges to wind. - 1 online resource (256 pages)

Source: Dissertations Abstracts International, Volume: 54-11, Section: B.

Thesis (Ph.D.)--The Johns Hopkins University, 1993.

Includes bibliographical references

Multimode analysis of flexible bridges, in particular of cable-stayed bridges, is required for accurate prediction of their response to wind. This study has endeavored to improve the methodologies for flutter and buffeting response prediction that are required for a multimode treatment. New identification methods for assessing experimental parameters from section-model tests are developed. As a vehicle for demonstration of the methods developed, the present work focuses on the Tsurumi Fairway cable-stayed twin bridges presently under construction in Japan. These parallel twin bridges, of 510 m center span, have streamlined bridge-deck sections that offer an excellent opportunity to study effects both of their sectional form and their side-by-side configuration. A system-identification (SID) method is presented that simultaneously identifies all the flutter derivatives of a bridge deck directly from section-model test results. The robustness and reliability of this SID method under a low signal-to-noise ratio is first demonstrated through numerical simulation. Later, two-degree-of-freedom (vertical and torsional) coupled-motion tests are performed on the section model under a smooth flow in the wind tunnel to extract all eight flutter derivatives simultaneously employing the SID method developed. The effect of grid-generated turbulence on the flutter derivatives is also demonstrated. Further, the present work determines static aerodynamic coefficients as well as the admittance functions pertinent to the buffeting forces. An alternate concept of aerodynamic transfer functions is introduced as an improved representation of the more common aerodynamic admittance functions, for use in buffeting-response analysis. Finally, the effect of the windward deck on the aeroelastic and aerodynamic characteristics of the leeward deck in the side-by-side configuration is demonstrated by further experiments. The work closes with a calculation of the critical flutter speed of the windward deck, which corroborates analogous results obtained in Japan.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798207846415Subjects--Topical Terms:

561339
Civil engineering.
Subjects--Index Terms:

bridgesIndex Terms--Genre/Form:

554714
Electronic books.

New identification methods applied to the response of flexible bridges to wind.
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