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Seismic fragility analysis of transmission towers considering effects of soil-structure interaction and depth-varying ground motion inputs
Bulletin of Earthquake Engineering ( IF 4.6 ) Pub Date : 2021-05-20 , DOI: 10.1007/s10518-021-01124-x
Haiyang Pan , Chao Li , Li Tian

Transmission towers are critical components of electrical transmission systems, whose damage and failure during earthquakes may cause extensive economic losses and significantly hinder the post-seismic rehabilitation. Seismic fragility analyses of pile-supported transmission towers are usually performed without regard for the influences of soil-structure interaction (SSI) and the site amplification of ground motions from the pile end to ground surface, which may lead to inaccurate structural performance evaluation results. In this context, the present study numerically investigates the seismic fragility of a typical pile-supported transmission tower considering SSI and depth-varying ground motion (DVGM) inputs. Specifically, a three-dimensional finite element model of the transmission tower is created in ABAQUS software, and SSI is simulated by adopting soil springs at the end of pile nodes. The three-dimensional DVGMs are stochastically synthesized to be used as seismic inputs. Moreover, the pushover analysis is employed to identify the threshold values of different limit states of the transmission tower. Then, probabilistic seismic demand models (PSDMs) are developed by nonlinear time history analyses and linear regression fitting, which are used to generate fragility curves. Furthermore, parameter studies are carried out to discuss the effects of SSI, DVGMs and structural parameter uncertainties on the seismic fragilities. Numerical results show that the seismic fragilities of the transmission tower can be affected substantially by the above mentioned three influencing factors. This research is expected to serve as an exploration to reliably and effectively evaluate the seismic fragility of a transmission tower with SSI.



中文翻译:

考虑土-结构相互作用和地震动输入变化的输电塔抗震性分析

输电塔是输电系统的重要组成部分,其在地震中的损坏和故障可能会造成广泛的经济损失,并严重阻碍地震后的恢复。通常在进行桩支撑输电塔的地震易损性分析时,没有考虑土-结构相互作用(SSI)的影响以及从桩端到地表的地震动的放大作用,这可能会导致结构性能评估结果不准确。在这种情况下,本研究在数值上研究了考虑SSI和深度变化地震动(DVGM)输入的典型桩支撑输电塔的地震易损性。具体来说,在ABAQUS软件中建立了输电塔的三维有限元模型,SSI是通过在桩节点的末端采用土弹簧来模拟的。三维DVGM随机合成以用作地震输入。此外,采用推覆分析来识别输电塔的不同极限状态的阈值。然后,通过非线性时程分析和线性回归拟合,开发了概率地震需求模型(PSDMs),用于生成脆弱性曲线。此外,进行了参数研究以讨论SSI,DVGM和结构参数不确定性对地震脆弱性的影响。数值结果表明,上述三个影响因素对输电塔的地震脆弱性有较大影响。

更新日期:2021-05-22
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