The newly developed ± 800kV UHVDC tower demonstrates improved stiffness and reduced displacement from cable tension adjustments.
The ± 800kV UHVDC corrective maintenance tower adopts a modular double-column structure to meet the requirements of tower assembly under different heights. The standard section adopts a nested design, which can save the storage and transportation space of the corrective maintenance tower. The design calculation shows that with the increase of the cable pretension, the column pressure and cable tension change slightly, but it can improve the overall stiffness of the corrective maintenance tower and significantly reduce the top displacement of the column. The ratio of the cable pretension to the rated tension increases from 10% to 25%, and the top displacement of the column can be reduced by 20%. The corrective maintenance tower successfully passed the real test, which shows that the geometric nonlinear calculation of the tower bearing capacity meets the structural design requirements.
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Li et al. (2025) studied this question.
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