考虑不同地震输入方向的输电塔-线体系连续性倒塌研究

Study of Progressive Collapse of Transmission Tower-Line System Considering Different Incident Angles of Earthquake Waves

摘要:

选取一实际输电线路为实例，在ABAQUS里选用梁-杆混合单元生成了该工程的计算模型。采用自主研发的用户材料子程序，研究了输电塔-线体系在3种不同地震波作用下的倒塌破坏过程与倒塌机理。结果表明：相比于侧向，纵向是输电塔-线体系的相对不利方向；两种激励情况下，最容易失效的杆件类型均为辅助材，破坏最严重杆件类型均为斜材；不同地震波以及不同输入方向通常会导致不同的薄弱位置。

Abstract:

This paper analyzes the problem of the progressive collapse of a long-span transmission tower-line system by considering different incident angles of earthquake waves. Based on a practical project example, we established a finite element model in ABAQUS that consists of two transmission towers and three transmission lines. We then studied the collapse mechanism and failure process of the transmission tower-line system with respect to three typical seismic records (El Centro, Taft, and Northridge waves). The research results show that under seismic action the longitudinal direction is relatively more unfavorable than the lateral direction. In different types of members, the auxiliary material is most likely to fail and the bracing rod to be most seriously damaged. Different seismic waves and incident directions will result in different positions of weakness.