输电塔线体系疲劳损伤时变可靠性与生命周期预测研究

Through the probabilistic and statistical data of typical environmental loads and structural system response, the load and response distribution model and its combined action model of reliability theory for transmission tower-line system should be established. With numerical analysis method, the sensitive substructures or components for fatigue damage can be found out and determined from a transmission tower line system, furthermore, a substructure and transmission-line fatigue damage test scheme can be designed; compared numerical analysis with test results from random load response, the fatigue reliability failure mode and failure criterion of the substructure and transmission-line can be determined, and the reliability theory and the calculation method also can be established; based on the structural system features and its failure mode, the series or parallel connection failure system and system reliability calculation theory of the structural system can be built so as to improve the design level of transmission tower-line system. According to the timing characteristics of stochastic environmental load response in using and fatigue damage characteristics of structural system, the time-variant reliability calculation theory and life cycle prediction-calibration method can be presented; summarizing environment load factors, material fatigue parameters and failure criteria of transmission tower-line system, the management system for monitoring, detection and repair decision and operation based on structural life cycle prediction can be established, so that the operation quality and the ability of resisting environmental load of transmission tower-line system should be improved.

通过典型环境荷载作用与结构体系响应资料概率统计分析，建立输电塔线体系可靠性理论荷载与响应分布模型和组合作用模型；采用数值分析方法，确定输电塔系体系疲劳损伤的敏感子结构或构件，在此基础上，设计子结构与输电导线的疲劳损伤试验方案；对数值分析与试验成果进行对比研究，确定子结构与导线的随机荷载响应疲劳可靠性失效模式和破坏准则，建立可靠度理论与计算方法；基于结构体系的组成特征与失效模式，建立结构体系的串联或并联失效系统和系统可靠度计算理论，提高输电塔线体系的设计水准。根据结构体系疲劳损伤过程特征和使用过程中随机环境荷载响应的时变性，建立结构体系的时变可靠度计算理论和生命周期预测-校准方法；综合输电塔线体系环境荷载作用因素、材料疲劳参数和破坏准则，建立基于结构生命周期预测的结构体系监测、检测和维修决策与运营管理体系，提高输电塔线体系运行质量和抵御环境荷载灾变的能力。

通过典型环境荷载作用与结构体系响应资料概率统计分析，建立了输电塔线体系可靠性理论荷载与响应分布模型和组合作用模型；采用数值分析方法，确定了输电塔系体系疲劳损伤的敏感子结构或构件，在此基础上，设计了子结构与输电导线的疲劳损伤试验方案；对数值分析与试验成果进行对比研究，确定了子结构与导线的随机荷载响应疲劳可靠性失效模式和破坏准则，建立了可靠度理论与计算方法；基于结构体系的组成特征与失效模式，建立了结构体系的串联或并联失效系统和系统可靠度计算理论，提高输电塔线体系的设计水准。根据结构体系疲劳损伤过程特征和使用过程中随机环境荷载响应的时变性，建立了结构体系的时变可靠度计算理论和生命周期预测-校准方法；综合输电塔线体系环境荷载作用因素、材料疲劳参数和破坏准则，建立了基于结构生命周期预测的结构体系监测、检测和维修决策与运营管理体系，提高了输电塔线体系运行质量和抵御环境荷载灾变的能力。