| 输电塔-线体系简化模型地震作用下的连续性倒塌分析 |
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| 引用本文： | 徐震,王文明,林清海,金树,曹丹京,田利.输电塔-线体系简化模型地震作用下的连续性倒塌分析[J].西北地震学报,2015,37(2):304-309. |
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| 作者姓名： | 徐震 王文明 林清海 金树 曹丹京 田利 |
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| 作者单位： | 山东电力工程咨询院有限公司;山东大学土建与水利学院 |
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| 基金项目： | 国家自然科学基金项目(51208285);中国博士后科学基金项目(2012M521338) |
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| 摘 要： | 采用输电塔-线体系的简化模型,利用大型有限元软件ABAQUS对某输电塔进行地震作用下的连续性倒塌分析,研究输电塔的薄弱部位和倒塌全过程。分析结果表明,采用简化模型得到的输电塔薄弱环节和连续性倒塌过程与采用三塔四线模型得到的结果具有较好的一致性,简化模型可用于输电塔-线体系的连续性倒塌分析。
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| 关 键 词： | 输电塔-线体系 简化模型 连续性倒塌分析 地震作用 |
| 收稿时间： | 2014/7/1 0:00:00 |
Progressive Collapse Analysis of a Simplified Model for Transmission Tower-line Coupled System under Seismic Action |
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| XU Zhen,WANG Wen-ming,LIN Qing-hai,JIN Shu,CAO Dan-jing and TIAN Li.Progressive Collapse Analysis of a Simplified Model for Transmission Tower-line Coupled System under Seismic Action[J].Northwestern Seismological Journal,2015,37(2):304-309. |
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| Authors: | XU Zhen WANG Wen-ming LIN Qing-hai JIN Shu CAO Dan-jing and TIAN Li |
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| Institution: | XU Zhen;WANG Wen-ming;LIN Qing-hai;JIN Shu;CAO Dan-jing;TIAN Li;Shandong Electric Power Engineering Consulting Institute Corporation Limited;School of Civil and Hydraulic Engineering,Shandong University; |
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| Abstract: | Overhead high-voltage electric-transmission lines play an important role in the operation of a reliable electrical power system.Damage to these lines can cause great economic loss and bring inconvenience to human life.A substantial number of transmission lines have been damaged by catastrophic earthquakes around the world.The transmission tower tilt or collapse,conductor breakage,foundation subsidence,and insulator destruction were the major types of failure.It is necessary to study not only the seismic response of transmission lines in the elastic and plastic phases but also their collapse process.Progressive collapse analysis is a well-understood physical occurrence in which the loss of local load-bearing capacity propagates through a system,precipitating complete collapse or a major portion of it.The vulnerable points,collapse mode,and capacity of the structure can be evaluated by it,and these data can be used for the design of new towers or for evaluating existing towers.Many scholars have studied the nonlinear responses of single transmission towers or tower-line coupled systems.Numerical simulation of progressive collapse is a challenging task,which includes material and geometric nonlinearity,contact and collision between elements,and losing the load-bearing capacity of elements.Nowadays,there are mainly four numerical analytical methods used for the collapse analysis:the discrete-element method (DEM),combined finite-discrete element method,applied-element method (AEM),and finite-element method (FEM).The FEM,based on continuum mechanics,is the most widely used method in structural engineering.For linear elastic problems,the method has proved to be advantageous.Furthermore,the method is very effective for solving nonlinear problems by using reasonable constitutive relationships.The method can be used in the solution of large-scale and complex industrial problems,while other methods are extremely difficult to use.During the collapse process under an earthquake,some elements lose load-bearing capacity,which is a problem for the FEM.Commonly,the method of removing these elements is used,which is called the birth-death element method.The conductors and ground wires can be simplified as concentrated masses for the seismic analysis of transmission tower-line coupled systems.In this paper,this method is used.With the simplified model,by using the finite-element program ABAQUS,the progressive collapse analysis of a transmission tower under an earthquake is conducted.The results show that the vulnerable points and progressive collapse process obtained are in good accord with the results obtained by using the tower-line coupled system with three towers and four span lines.Therefore,the simplified model can be used in the seismic analysis of transmission tower-line coupled systems. |
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| Keywords: | transmission tower-line coupled system simplified model progressive collapse analysis earthquake action |
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