Effects of preload deficiency on fatigue demands of wind turbine tower bolts

结构工程 塔楼 预加载 涡轮机 工程类 压力(语言学) 输电塔 疲劳极限 应力集中
作者
Behrouz Badrkhani Ajaei,Serdar Soyoz
出处
期刊:Journal of Constructional Steel Research [Elsevier BV]
被引量:3
标识
DOI:10.1016/j.jcsr.2020.105933
摘要

ABSTRACT This paper investigates the effect of bolt preload level on fatigue damage in eccentrically loaded bolts of ring flange connections, which are commonly utilized in wind turbine towers. Aerodynamic simulations of the turbine were conducted, and resulting forces were applied to a detailed finite element model of the maximally loaded segment of the bolted connection. Fatigue analyses were performed on the results of the finite element analyses. The study results indicate that a reduction in bolt preload led to an increase in ranges of stress fluctuations, which in turn resulted in increased fatigue damage. The effect of preload loss on stress ranges and fatigue damage were observed more clearly and significantly after the preload dropped to values around 25% of the design preload. Moreover, the simulation results showed that the bending stresses have a major role in fatigue demands in the bolt, and therefore should be included in fatigue damage calculations. However, the contribution of the bolt bending stresses to fatigue demands is more significant in higher preloads, and decreases as the preload is reduced.
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