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Shock and Vibration
Volume 2014 (2014), Article ID 124536, 22 pages
http://dx.doi.org/10.1155/2014/124536
Research Article

A Study on the Impact Coefficient of Traffic Flows on a Large Cable-Stayed Bridge in a Windy Environment

1Department of Civil Engineering, University of Hohai, No.1 Xikang Road, Nanjing, Jiangsu 210098, China
2Department of Bridge Engineering, University of Chang’an, Middle of S. 2nd Ring Road, Xi’an, Shaanxi 710064, China

Received 26 June 2014; Accepted 28 August 2014; Published 17 November 2014

Academic Editor: Vadim V. Silberschmidt

Copyright © 2014 L. Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

By developing a wind-vehicle-bridge coupling dynamic analysis system, the impact coefficient of traffic flows on a cable-stayed bridge and its probabilistic distribution are studied in the paper. Some important influence factors of the impact coefficient, such as the vehicle-bridge coupling effect, traveling velocity, and traffic density, are analyzed. The influence of the coupling effect between a bridge deck’s buffeting and vehicles’ vibration on the impact coefficient of traffic flows on a cable-stayed bridge is paid due attention to. The results show that vehicle-bridge coupling effect and surface roughness exert important influence on the impact effect of a cable-stayed bridge. Considering that impact coefficient of traffic flows on a bridge bears the characteristics of randomness, the paper, on the basis of a large number of samples, interprets the influence of traveling velocity and traffic density in view of its probabilistic distribution. In view of results derived from the coupling dynamic analysis, it is suggested that the impact coefficient be 25% for all spans of a long cable-stayed bridge like the Sutong Yangtze Bridge.