送电线路杆塔结构可靠度影响参数及规律研究

特高压送电线路在世界范围内目前处于应用探索阶段,其杆塔结构设计尚未出台相关规范。基于杆塔结构的设计基本表达式和功能函数,对影响杆塔结构可靠度的设计参数进行了分析;采用一次二阶矩方法(JC法)评定了现行相关杆塔结构设计规程的可靠度;依托某实际典型特高压送电线路设计资料,分析了结构重要性系数和设计风速取值等参数对特高压杆塔结构可靠度的影响规律,指出了按现行规程设计的不同风速地区杆塔结构可靠度的不均衡性等问题。分析结果可供特高压送电线路杆塔结构设计规范制定参考。

THE FACTORS INFLUENCING RELIABILITY OF POLE AND TOWER STRUCTURES

Because the application of UHV transmission line is still in exploration stage worldwide,there are no national codes and professional technical regulations of design for such structures. Based reliability theory, referencing design method of technical regulation now in use,the factors which influencing the reliability of the structure were investigated. The reliability of the structure designed according to current technical regulations is assessed by JC method. Depending on the design files of an UHV transmission line in practice,the influences of the importance factor of the structure and design wind load on the reliability of poles and tower structures were researched. There are some results proposed such as the reliability of the structure in different wind load would not be the same by current technical regulations,etc. The analysis results can be benifit for code of UHV transmission line establishment.