基于有限元分析高压输电塔结构的地震反应

Estimating seismic responses of transmission towers by finite element method

输电塔结构是重要的生命线工程,对风和地震等环境荷载十分敏感。近几年,世界各地发生过多起输电塔破坏事件,给人们的生命财产和社会经济带来了巨大的损失。因此,对输电塔在风荷载和地震作用下进行更精确的分析就显得十分重要。本文采用SAP2000有限元分析软件,使用三维模型对高压输电塔结构进行多个地震动作用下的模拟计算分析。通过对同一输电塔结构输入多种不同的地震动,研究了地震的随机性对输电塔结构地震反应的影响。经对输电塔在不同地震动作用下地震结构反应的数据处理,比较其最大应力、最小应力和变形值,获得结构的地震反应特征。进一步将数据进行拟合得数值模拟计算的离散情况,从而给出不同地震动下输电塔结构地震反应的更一般情况。

Transmission loads and earthquakes towers are important lifeline systems. It In the past few years, some transmission is susceptible to environmental loads, such as wind towers have been damaged or destroyed, thus leading to great loss of people life and property. High accurate analysis thus is required to be performed for transmission towers subjected to wind loads or earthquakes. By using SAP2000 general software, a three-dimensional model is taken into account here to implement the dynamic analysis of transmission towers under earthquakes. Employing different earthquake acceleration records, the influence of the stochastic behaviors of earthquakes on the structural seismic responses has been investigated. Both the stress and the deformation of transmission towers in seismic regions have been computed to get an insight into the behavior of transmission tower structures under earthquakes. Dealing with the computational data further provides the dispersiveness of numerical simulations, consequently it renders more general characteristics of transmission tower structures subjected to earthquakes.