Seismic and collapse analysis of a UHV transmission tower-line systemunder cross-fault ground motions

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
L. Tian, Wenzhe Bi, Juncai Liu, Dong Xu, Aiqiang Xin
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引用次数: 4

Abstract

An ultra-high voltage (UHV) transmission system has the advantages of low circuitry loss, high bulk capacity and long-distance transmission capabilities over conventional transmission systems, but it is easier for this system to cross fault rupture zones and become damaged during earthquakes. This paper experimentally and numerically investigates the seismic responses and collapse failure of a UHV transmission tower-line system crossing a fault. A 1:25 reduced-scale model is constructed and tested by using shaking tables to evaluate the influence of the forward-directivity and fling-step effects on the responses of suspension-type towers. Furthermore, the collapse failure tests of the system under specific cross-fault scenarios are carried out. The corresponding finite element (FE) model is established in ABAQUS software and verified based on the Tian-Ma-Qu material model. The results reveal that the seismic responses of the transmission system under the cross-fault scenario are larger than those under the near-fault scenario, and the permanent ground displacements in the fling-step ground motions tend to magnify the seismic responses of the fault-crossing transmission system. The critical collapse peak ground acceleration (PGA), failure mode and weak position determined by the model experiment and numerical simulation are in relatively good agreement. The sequential failure of the members in Segments 4 and 5 leads to the collapse of the entire model, whereas other segments basically remain in the intact state.
跨断层地震动作用下特高压输电塔-线系统的地震与坍塌分析
与传统输电系统相比,特高压输电系统具有线路损耗低、大容量和远距离传输能力等优点,但在地震中,特高压输电系统更容易穿越断层破裂带而遭到破坏。本文对特高压输电塔线系统穿越断层时的地震反应和倒塌破坏进行了实验和数值研究。建立了1:25缩小模型,并利用振动台进行了试验,以评估前向性和飞阶效应对悬架型塔响应的影响。此外,还进行了系统在特定跨断层场景下的坍塌破坏试验。在ABAQUS软件中建立相应的有限元模型,并基于天马衢材料模型进行验证。结果表明:跨断层情况下输电系统的地震响应大于近断层情况下的地震响应,并且飞阶地震动中的永久地面位移倾向于放大跨断层输电系统的地震响应。模型试验和数值模拟确定的临界崩塌峰值地加速度、破坏模式和薄弱位置具有较好的一致性。段4和段5成员的连续失效导致整个模型崩溃,而其他段基本保持完好状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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