CAJ | 학술논문

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。
채용수전탑-선체계적간화모형，이용대형유한원연건 ABAQUS 대모수전탑진행지진작용하적련속성도탑분석，연구수전탑적박약부위화도탑전과정。분석결과표명，채용간화모형득도적수전탑박약배절화련속성도탑과정여채용삼탑사선모형득도적결과구유교호적일치성，간화모형가용우수전탑-선체계적련속성도탑분석。
Overhead high-voltage electric-transmission lines play an important role in the opera-tion 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,precipi-tating complete collapse or a major portion of it.The vulnerable points,collapse mode,and capaci-ty 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 be-tween 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.Fur-thermore,the method is very effective for solving nonlinear problems by using reasonable consti-tutive 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.Common-ly,the method of removing these elements is used,which is called the birth-death element meth-od.The conductors and ground wires can be simplified as concentrated masses for the seismic a-nalysis 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 u-sing 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.