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Mathematical Problems in Engineering - Volume 2014 2014, Article ID 486524, 10 pages -

Research ArticleCollege of Civil Engineering and Environment, Ningbo University, Ningbo 315211, China

Received 5 January 2014; Revised 18 June 2014; Accepted 23 June 2014; Published 14 July 2014

Academic Editor: Gisele Mophou

Copyright © 2014 Zihua Zhang 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

Recently, a number of wind power structures in tropical cyclone zones are damaged by typhoon. In order to study the failure mechanics and failure modes of wind power structure subjected to typhoon, the typhoon wind field in Dongtai wind farm is simulated based on the classical autoregressive AR model and a regional power-spectrum-density PSD model, and the simulated spectrum is verified to be in good agreement with the target spectrum. An integrated finite element FE model of wind power structure, composed of rotor, nacelle, tower, pile cap, and PHC piles, is established. Modal analysis reveals that pile stiffness decreases the structure’s natural frequencies, especially for high order frequencies. Structural responses under the simulated typhoon are calculated by dynamic analysis. Results show that tower buckling is the most prone failure mode of the structure. The horizontal displacement of the hub and the axial force of the most unfavorable piles are both under the limit. This study provides a way to the antityphoon design of large-scale wind power structures.





Autor: Zihua Zhang, Junhua Li, and Ping Zhuge

Fuente: https://www.hindawi.com/



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