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输电线路杆塔疲劳可靠性研究

期刊名称：中国电机工程学报，06期，2008.(EI收录)
时间：0
分类：TM752[电气工程—电力系统及自动化]
作者机构：[1]海岸与近海工程国家重点实验室（大连理工大学）,辽宁省大连市116024
相关基金：国家自然科学基金项目（50638010）教育部创新团队项目（IRT0518）;高等学校博士点基金项目（20060141027）.
相关项目：高压输电塔-线体系抗震抗风基础研究

关键词：格构式杆塔, 风(雨)荷载作用, 疲劳损伤与寿命, 可靠性分析, 影响因素, lattice transmission tower, wind （rain） loading action, fatigue damage and lifetime, reliability analysis, influence factors

中文摘要：

结合输电杆塔的结构和环境荷载的概率分布特征，以结构疲劳损伤和设计使用寿命为控制条件，在对杆塔结构进行合理简化与风雨荷载随机分布有效建模的基础上，提出一套完整有效的分析杆塔结构在环境荷载作用下发生疲劳损伤、疲劳破坏的可靠度分析方法。以实际杆塔在模拟环境荷载条件下的疲劳可靠性分析为例，分别采用一次二阶矩法和完全分布法计算疲劳失效概率，并考察峰值分布假定、荷载组合与相关参数对结构疲劳可靠度的影响程度。分析结果表明，疲劳可靠度指标与峰值应力假定和风荷载的相干程度有关；结构失效概率随着风暴发生频次和持续时间的增长而增加，计入雨荷载时尤为如此。

英文摘要：

Considering the characteristics of transmission tower-line system and probability distribution of environmental loading, the reliability analysis method for fatigue failure caused by fatigue damage under environmental loading is proposed, which is based on the modeling of wind and rain loading stochastic distribution and reasonable simplification of transmission tower-line system with taking fatigue damage and designed lifetime as controlling condition. Taking a real transmission tower under simulated environmental loading conditions as an example of fatigue reliability analysis, the fatigue failure probabilities are calculated with the first-order second-moment method and full distribution method respectively. And then, the influence of stress peak distribution assumption, loading combination and coherence parameters on structural fatigue reliability are analyzed. The analytical results show that the fatigue reliability indices are related to stress peak distribution assumption and coherence degree of wind loading, and structural failure probability should increase with occurrence times and duration of storms, especially in condition with the rain loads.