跨越高速铁路输电杆塔静力可靠度分析
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摘要
跨越高速铁路输电杆塔是整个输电线路大跨越工程中重要的组成部分。本文选取一基500kV跨越高速铁路输电杆塔作为研究对象,采用ABAQUS有限元软件建立了其三维有限元模型。基于改进的一次二阶矩法(JC法)和窄界限法,对可变荷载与永久荷载共同作用下的输电杆塔进行了可靠度分析。研究结果表明,考虑10mm覆冰荷载时,输电杆塔中可靠度水平最低的杆件多数位于塔的横担处,少数位于塔腿处;输电杆塔的整体可靠度分别为4.6269,高于跨越高铁线路输电线路杆塔目标可靠指标3.7的要求。研究结果可以为跨越高速铁路输电杆塔的可靠度评估提供重要的参考依据。
Transmission tower crossing high speed railway is an important part in long span overhead Transmission Line Crossing project. In this paper, a 500 KV transmission tower crossing high speed railway is selected as the research object, whose three-dimensional finite element model is established by ABAQUS finite element software. Based on the improved FOSM and narrow boundary method, the reliability of power transmission towers under the combined effect of variable load and permanent load is analyzed. The results show that most of the elements with the lowest reliability level are located at the crossarm of the tower and a few at the tower leg as considering the 10 mm ice load; the overall reliability of the power transmission tower is 4.6269, which are slightly lower than the requirement of 3.7 for the transmission line crossing high speed railway. The research results can provide important reference for design of transmission tower crossing high speed railway.
Transmission tower crossing high speed railway is an important part in long span overhead Transmission Line Crossing project. In this paper, a 500 KV transmission tower crossing high speed railway is selected as the research object, whose three-dimensional finite element model is established by ABAQUS finite element software. Based on the improved FOSM and narrow boundary method, the reliability of power transmission towers under the combined effect of variable load and permanent load is analyzed. The results show that most of the elements with the lowest reliability level are located at the crossarm of the tower and a few at the tower leg as considering the 10 mm ice load; the overall reliability of the power transmission tower is 4.6269, which are slightly lower than the requirement of 3.7 for the transmission line crossing high speed railway. The research results can provide important reference for design of transmission tower crossing high speed railway.
引文
[1] K.Natarajan and A.R.Santhakumar. Reliability-based Optimization of Transmission Linetowers[J]. Computers&Structures, 1993, 55(3):387-403.
[2] G.Visweswara Rao. Optimum Designs for Transmission Line Towers[J]. Computers&Structures, 1995, 57(1):81-93.
[3]李茂华,李正,任吉华,等. 500kV输电线路杆塔结构的可靠性分析[J].电网技术, 2008, 32(23):91-94.
[4]姚陈果,李宇,周泽宏,等.基于极限承载力分析的覆冰输电塔可靠性评估[J].高电压技术, 2013, 39(11):2609-2614.
[5]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007.
[6] GB 50153-2008,工程结构可靠性设计统一标准[S].
[7]陈海波,廖宗高,肖洪伟.受风荷载控制的杆塔结构体系可靠度分析[J].电力建设,2007,28(7):40-45.
[8] GB 50009-2012,建筑结构荷载规范[S].
[9] DL/T 5154-2012,架空输电线路杆塔结构设计技术规定[S].
[10]贡金鑫,李宏男,冯云芬,等.跨越高铁输电线路的可靠度和技术方案研究[R].大连:大连理工大学,2013.
[2] G.Visweswara Rao. Optimum Designs for Transmission Line Towers[J]. Computers&Structures, 1995, 57(1):81-93.
[3]李茂华,李正,任吉华,等. 500kV输电线路杆塔结构的可靠性分析[J].电网技术, 2008, 32(23):91-94.
[4]姚陈果,李宇,周泽宏,等.基于极限承载力分析的覆冰输电塔可靠性评估[J].高电压技术, 2013, 39(11):2609-2614.
[5]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007.
[6] GB 50153-2008,工程结构可靠性设计统一标准[S].
[7]陈海波,廖宗高,肖洪伟.受风荷载控制的杆塔结构体系可靠度分析[J].电力建设,2007,28(7):40-45.
[8] GB 50009-2012,建筑结构荷载规范[S].
[9] DL/T 5154-2012,架空输电线路杆塔结构设计技术规定[S].
[10]贡金鑫,李宏男,冯云芬,等.跨越高铁输电线路的可靠度和技术方案研究[R].大连:大连理工大学,2013.