Fatigue life estimation of steel girder of Yangpu cable-stayed Bridge due to buffetin - Printable Version +- Civil Engineering Association (https://forum.civilea.com) +-- Forum: eBooks (https://forum.civilea.com/forum-63.html) +--- Forum: Journals, Papers and Presentations (https://forum.civilea.com/forum-74.html) +--- Thread: Fatigue life estimation of steel girder of Yangpu cable-stayed Bridge due to buffetin (/thread-42468.html) |
Fatigue life estimation of steel girder of Yangpu cable-stayed Bridge due to buffetin - asim99 - 03-31-2013 Fatigue life estimation of steel girder of Yangpu cable-stayed Bridge due to buffeting Author: M. Gu, Y.L. Xu, L.Z. Chen, H.F. Xiang | Size: 349 KB | Format: PDF | Quality: Unspecified | Publisher: Elsevier | Year: 199 | pages: 18
As the main span of modern cable-stayed bridges becomes longer and longer, the bu¤etinginduced fatigue damage problem of steel girders located in strong wind regions may have to be taken into consideration in the design of the bridge. This paper presents a method in the mixed frequencyÐtime domain for estimating the fatigue life of steel girders of the Yangpu cable-stayed Bridge due to bu¤eting. In the suggested method, the joint probability density function of wind speed and wind direction at the deck level of the bridge is Þrst established. The power spectra of the critical stress of the girder are then derived from the power spectra of the generalized coordinates of the bridge for di¤erent wind speeds and wind directions. The derived stress spectra are no longer a narrow spectrum when the background component of stress response is included. Thus, the time histories of the critical stress are simulated from their power spectra and the stress cycle distributions are estimated in terms of rainßow count method. The formulae derived based on the modiÞed Miner law and the random vibration theory are Þnally used for estimating the fatigue life of the bridge girder. The results show that the e¤ects of wind direction on the fatigue life of the Yangpu Bridge are signiÞcant. The predicted fatigue life due to bu¤eting is much longer than the design life of the bridge Code: *************************************** |