摘要
以研究地基及基础位移对整塔内力及变形的影响为目的,通过结构有限元分析软件SAP 2000对现有某220 k V输电线路SJ3转角塔进行建模和分析。考察输电铁塔在90°大风、覆冰和导线张力等外荷载作用下,模拟塔腿基础支座发生不同变位的荷载工况对塔身变形及塔材失效的影响规律,确定不同工况下底部塔材的内力发展过程及其失效位移。研究表明,针对不同的地基及基础变位工况,塔腿上侧横隔面是整塔最薄弱部分,塔腿根部支座位移会引起横隔杆件的快速失效,单只塔腿基础支座沉降对塔腿影响最大;塔腿支座水平外移对底部横隔杆件影响最大;塔腿支座水平内移是引起塔腿斜材失效的最危险工况。
In order to investigate the influence on internal forces and deformation of transmission tower with foundation displacements,the finite element model of SJ3 transmission tower in 220 k V transmission line was established and analyzed by SAP 2000. Based on the analysis,the deformation of tower body and the failure process of tower materials with different displacement conditions were studied under the 90° wind load,ice load and conductor load. Besides,the internal force variation and displacement limitations of tower members with different displacement conditions were determined. The results showed that the horizontals of the tower bottom were the weakest part of the whole tower,nearly all the displacement conditions could cause the faliure of tabula members. The support settlement influenced the internal forces of tower legs mostly. Outer horizontal movements of supports influenced the internal forces of the bottom tabula members mostly. Inner movements was the most dangerous in all displacement conditions.
出处
《钢结构》
北大核心
2016年第9期34-38,72,共6页
Steel Construction
基金
江苏省人力资源和社会保障厅2013年"六大人才高峰"(B类)前瞻性联合研究项目(BY2014005-11)
关键词
输电铁塔
基础位移
杆件内力
失效模式
transmission tower
foundation displacements
member＇s internal force
failure mode
