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原文传递 Determination of 18 Flutter Derivatives of Bridge Decks by an Improved Stochastic Search Algorithm

题名：	Determination of 18 Flutter Derivatives of Bridge Decks by an Improved Stochastic Search Algorithm
正文语种：	中文
作者：	F.Y.Xu X.Z.Chen C.S.Cai M.ASCE A.R.Chen
作者单位：	School of ivil Engineering, alian Univ.of Technology, alian, hina 116024 Wind Science and Engineering Research enter, Texas Technology Univ., Lubbock, TX 79409 ept.of ivil and Environmental Engineering, Louisiana State Univ., Baton Rouge, L 70803 ept.of Bridge Engineering, Tongji Univ., Shanghai, hina 200092 4
关键词：	Author keywords: Flutter derivative System identification Improved stochastic search algorithm Wind tunnel test Bridge aerodynamics Long-span bridges
摘要：	This paper addresses the determination of the 18 flutter derivatives of bridge decks from three degrees-of-freedom (3DOF) free vibration data using an improved stochastic search algorithm (ISSA) combined with the unified least-squares (ULS) method.The ISSA is capable of circumventing the local optimum dilemma in pursuing the optimal solution experienced in the traditional ULS method.The validity and accuracy of the ISSA are demonstrated by one numerical example and two long-span, cable-stayed, bridge deck sections.The attractive merit of using different lengths of vertical, torsional, and lateral vibration data in flutter derivatives identification is investigated.The identification error and modal participations in flutter are easily examined through a decomposition of modal components from the original vibration data.The underlying complexities in aeroelastic parameter identification are studied, and the causes of low accuracy of some flutter derivatives are unveiled.Based on the comparative investigation on the aerodynamic characteristics of typical streamlined and bluff bridge decks, an improved understanding of the coupled bridge flutter is achieved.
会议日期：	201405
会议举办地点：	大连
会议名称：	大工桥梁学科三十年学术研讨会
出版日期：	2014-04-30
母体文献：	大工桥梁学科三十年学术研讨会论文集