Service State Inspection and Failure Mode Analysis of Old Welded Towers
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摘要: 以ZT典型老旧焊接铁塔为研究对象,基于高压输电线路上老旧焊接铁塔设计资料缺失、设计标准的改变、服役损伤等问题,提出ZT型老旧焊接铁塔的服役现状检测和分析方法,基于ABAQUS软件模拟研究了设计条件、约束条件的变化和杆件锈蚀对该ZT型老旧铁塔承载能力和破坏模式的影响。研究结果表明:按现行的设计标准要求,老旧焊接铁塔在90°大风工况和不均匀覆冰工况下主要承载构件的各杆件应力均不满足设计标准要求;护台的增加改变了应力分布,破坏区域由塔下部分向塔中部发展;在约束条件改变和杆件锈蚀的缺陷下,该ZT型老旧焊接铁塔在遭遇90°、18 m/s风速时,第②和④段将发生失稳破坏。Abstract: Taking the typical ZT-type old welded tower as an example, based on the uncertainty in service and potential safety risk caused by the missing design data, changes in design specifications and damages in service, a inspection method in service was proposed. The influence of the change of constraint conditions and different corrosion ratios in steels on the failure mode of ZT-type old welded towers was discussed. The results showed that according to the new design code, the rods of main members did not meet the requiments under a gale, in the 90° direction and the uneven icing. The post-constructed concrete platform changed the stress of the tower, the failure zone developed from the lower part of the tower towards the middle. Due to the changes of constraint conditions and deficiency of rods, the main members in segment No.2 and No.4 of the tower would fail under a gale of 18 m/s in the 90° direction.
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Key words:
- old welded tower /
- service status /
- corrosion /
- protective platform /
- failure mode
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