摘要
Given the background of a transmission tower erected on a particular mining subsidence area,we used finite element modeling to analyze the anti-deformation performance of transmission towers under a number of different load conditions,including horizontal foundation displacement,uneven vertical downward displacement,wind loads and icing conditions.The results show that the failure in stability of a single steel angle iron represents the limit of the tower given ground deformation.We calculated the corresponding limits of foundation displacements.The results indicate that compression displacement of the foundation is more dangerous than tension displacement.Under complex foundation displacement conditions,horizontal foundation displacement is a key factor leading to failure in the stability of towers.Under conditions of compression or tension displacement of the foundation,wind load becomes the key factor.Towers do not fail when foundation displacements are smaller than 1% (under tension) or 0.5% (under horizontal compression or single foundation subsidence) of the distance between two supports.
Given the background of a transmission tower erected on a particular mining subsidence area, we used finite element modeling to analyze the anti-deformation performance of transmission towers under a number of different load conditions, including horizontal foundation displacement, uneven vertical downward displacement, wind loads and icing conditions. The results show that the failure in stability of a single steel angle iron represents the limit of the tower given ground deformation. We calculated the corresponding limits of foundation displacements. The results indicate that compression displace- ment of the foundation is more dangerous than tension displacement. Under complex foundation dis- placement conditions, horizontal foundation displacement is a key factor leading to failure in the stability of towers. Under conditions of compression or tension displacement of the foundation, wind load becomes the key factor. Towers do not fail when foundation displacements are smaller than 1% （under tension） or 0.5% （under horizontal compression or single foundation subsidence） of the distance between two supports.
基金
National Natural Science Foundation of China(No.50004008)
Xuzhou Power Supply Company and the Fundamental Research Funds for the Central Universities(No.2011QNB18) for their financial and technical support for this work
关键词
高压输电塔
地基位移
采煤沉陷区
基础位移
横向压缩
水平位移
建模分析
负载条件
Mining subsidence area
Electricity transmission tower
Foundation displacement limit
Finite element analysis
Limit state
Stability failure
