Seismic Damage and Vulnerability Analysis of the Long-Span GIS Portal Steel Frame without Seismic Joints

Dejun Mu; Lina Fu; Tao Cui; Shiyu Ran; Hongfei Chang; Qixiang Yin; Boyang Zhang

doi:10.2991/978-94-6463-932-2_11

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Seismic Damage and Vulnerability Analysis of the Long-Span GIS Portal Steel Frame without Seismic Joints

Authors

Dejun Mu¹, Lina Fu¹, Tao Cui¹, Shiyu Ran², Hongfei Chang²^{, *}, Qixiang Yin³, Boyang Zhang⁴

¹Shandong Electric Power Engineering Consulting Institute Co., Ltd., 250013, Jinan, Shandong, China

²Jiangsu Key Laboratory of Disaster Impact and Intelligent Prevention in Civil Engineering, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China

³School of Architectural Construction, Jiangsu Vocational Institute of Architectural Technology, 221116, Xuzhou, Jiangsu, China

⁴Henan Polytechnic University, 454000, Jiaozuo, Henan, China

^*Corresponding author. Email: chf_cumt@163.com

Corresponding Author

Hongfei Chang

Available Online 22 December 2025.

DOI: 10.2991/978-94-6463-932-2_11 How to use a DOI?
Keywords: UHV converter station; Long-span GIS portal steel frame; Incremental dynamic analysis; Seismic damage and vulnerability analysis
Abstract: To improve the seismic resilience of ultra-high voltage (UHV) converter stations, this study focuses on the seismic response and seismic damage and vulnerability analysis of a 750 kV long-span GIS portal steel frame. A nonlinear finite element model was established using ABAQUS and SAP2000, considering the material nonlinearity. Modal analysis and time-history analyses under unidirectional and three-dimensional ground motions were conducted. Results reveal significant vertical (Z-direction) deformation and an overall cooperative deformation mechanism, which should not be overlooked. Based on Incremental Dynamic Analysis (IDA), 15 far-field ground motions were scaled to multiple intensity levels. Using peak interstory drift ratio as the damage index, seismic fragility curves were developed. The structure demonstrates considerable nonlinear behavior under strong earthquakes, and displacement demands under three-dimensional excitation are significantly higher than under unidirectional input, highlighting the need for enhanced vertical response control. Under a rare 8-degree (PGA = 0.3 g) earthquake, the probabilities of moderate and severe damage reach 77.43% and 18%, respectively. These findings provide a technical reference for the seismic design and post-earthquake assessment of long-span structures in UHV converter stations.
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title: Proceedings of the 2025 2nd International Conference on Civil Engineering Structures and Concrete Materials (CESCM 2025)
Series: Advances in Engineering Research
Publication Date: 22 December 2025
ISBN: 978-94-6463-932-2
ISSN: 2352-5401
DOI: 10.2991/978-94-6463-932-2_11 How to use a DOI?
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

ris enw bib

TY  - CONF
AU  - Dejun Mu
AU  - Lina Fu
AU  - Tao Cui
AU  - Shiyu Ran
AU  - Hongfei Chang
AU  - Qixiang Yin
AU  - Boyang Zhang
PY  - 2025
DA  - 2025/12/22
TI  - Seismic Damage and Vulnerability Analysis of the Long-Span GIS Portal Steel Frame without Seismic Joints
BT  - Proceedings of the 2025 2nd International Conference on Civil Engineering Structures and Concrete Materials (CESCM 2025)
PB  - Atlantis Press
SP  - 88
EP  - 94
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-932-2_11
DO  - 10.2991/978-94-6463-932-2_11
ID  - Mu2025
ER  -

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