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Failure Analysis of a Cruciform-Leg Transmission Line Tower
International Journal of Steel Structures ( IF 1.5 ) Pub Date : 2021-01-15 , DOI: 10.1007/s13296-021-00454-5
Veerendra Kumar Shukla , Munusamy Selvaraj , Kalla Vijaya Kumar

Design of latticed steel power transmission towers is a challenging task, which involves lengthy modeling and detailing of significant amount of steel members and connections. The tower is analyzed and designed as a space truss and various members of tower are checked for Tension, Compression and Slenderness Ratio. Sometimes, due to unavailability of required sections or economical point of view, single angle sections are replaced by Cruciform Sections (made of two angles connected toe to toe). The cruciform section, when connected with single angle sections, generate bending moments due to eccentric loading at connection on application of loads on tower, which subsequently results failure of the tower. In the present work, a full-scale testing of a 400 kV tower with built-up leg (Cruciform Leg connected with Single-Angle Leg) has been conducted and the behavior of joint on application of loads has been studied. While testing, one of the legs buckled at the connection. The failure pattern of the leg has been validated using FEM analysis, and the reason of failure has been discussed. In order to confirm the quality of steel, mechanical testing of steel used in leg has been carried out using UTM and results have been explained in the papers. The paper also gives some suggestions for the connection of this type of built-up sections used in tower in order to avoid such failures.



中文翻译:

十字腿式输电线路铁塔的失效分析

钢格架式输电铁塔的设计是一项艰巨的任务,涉及冗长的建模和详细化大量钢构件和连接的细节。对塔进行分析并设计为空间桁架,并检查塔的各个构件的拉伸,压缩和细长比。有时,由于无法提供所需的截面或从经济角度考虑,单角截面被十字形截面(由从趾到趾连接的两个角度组成)代替。当与单角度部分连接时,十字形部分由于在塔上施加载荷时由于连接时的偏心载荷而产生弯曲力矩,随后导致塔的破坏。在目前的工作中,进行了一个400 kV带有组合式支腿(十字形支腿与单角支腿相连)的铁塔的测试,并研究了接头在施加载荷时的行为。测试时,其中一根脚在连接处弯曲。腿部的故障模式已使用有限元分析进行了验证,并讨论了故障原因。为了确定钢的质量,已使用UTM对腿用钢进行了机械测试,并对结果进行了解释。为了避免这种故障,本文还提出了一些有关在塔架中使用这种组合部分的建议。并讨论了失败的原因。为了确定钢的质量,已使用UTM对腿用钢进行了机械测试,并对结果进行了解释。为了避免这种故障,本文还提出了一些有关在塔架中使用这种组合部分的建议。并讨论了失败的原因。为了确定钢的质量,已使用UTM对腿用钢进行了机械测试,并对结果进行了解释。为了避免这种故障,本文还提出了一些有关在塔架中使用这种组合部分的建议。

更新日期:2021-01-15
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