comparison of time domain techniques for the evaluation of the response and the stability in long span suspension bridges精品.pdfVIP

Computers and Structures 85 (2007) 1032–1048 /locate/compstruc Comparison of time domain techniques for the evaluation of the response and the stability in long span suspension bridges Francesco Petrini a, Fabio Giuliano b,*, Franco Bontempi a a Department of Civil Engineering, University ‘‘La Sapienza’’, Via Eudossiana 18, 00184 Rome, Italy b Department of Structural Mechanics, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy Received 8 June 2006; accepted 20 November 2006 Available online 16 January 2007 Abstract During the last decades, several studies on suspension bridges under wind actions have been developed in civil engineering and many techniques have been used to approach this structural problem both in time and frequency domain. In this paper, four types of time domain techniques to evaluate the response and the stability of a long span suspension bridge are implemented: nonaeroelastic, steady, quasi steady, modified quasi steady. These techniques are compared considering both nonturbulent and turbulent flow wind modelling. The results show consistent differences both in the amplitude of the response and in the value of critical wind velocity. 2006 Elsevier Ltd. All rights reserved. Keywords: Aeroelastic forces; Structural dynamics; Suspension bridge; Flutter; Buffeting M € C _ K q ¼ F ðbody shape; q; _ € V ; t; nÞ 1. Introduction q þ q þ q; q;