常见干字型输电塔地震易损性分析

Seismic Fragility Analysis of common Gan-type Transmission Tower

为了研究输电塔-线体系中输电塔破坏的问题,根据某实际输电塔进行有限元建模,基于分析结果确定并定义损伤状态极限,选择20条地震动记录进行调幅,使用增量动力分析方法,以输电塔主材和斜材的杆件节间相对位移角为地震需求参数,地震动峰值加速度为强度参数,通过IDA分析方法得到输电塔的易损性曲线,对输电塔进行震害分析。通过体系中输电塔的易损性曲线可以与输电塔单塔的易损性曲线进行对比,得到塔-线体系耦连对输电塔的影响。

In order to study the problem of transmission tower damage in the transmission tower-line system,thispaper carries out the finite element modeling according to an actual transmission tower.Based on the analysis results,the damage state limit is determined and defined,and 20 ground motion records are selected for amplitude modulation.Using the incremental dynamic analysis method,the relative displacement angle between the rod nodes of the mainmaterial and the inclined material of the transmission tower is taken as the seismic demand parameter,and the peakacceleration of ground motion is taken as the intensity parameter,the fragility curve of the transmission tower isobtained by the IDA analysis method to analyze the seismic damage of the transmission tower.The fragility curve ofthe transmission tower in the system can be compared with the fragility curve of the single tower of the transmissiontower,and the influence of the tower-line system coupling on the transmission tower can be obtained.