地表变形对输电铁塔内力和变形的影响规律  

Influence regularities of ground deformation on internal force and structure deformation of transmission tower

作　　者：袁广林[1] 杨庚宇[2] 张云飞 

机构地区：[1]中国矿业大学建筑工程学院,江苏徐州221008 [2]华北科技学院,北京101601 [3]徐州供电公司,江苏徐州221006

出　　处：《煤炭学报》2009年第8期1043-1047,共5页Journal of China Coal Society

摘　　要：以某塌陷区上典型输电铁塔为背景,采用数值分析方法,研究了地表变形对铁塔结构内力和变形的影响规律,获得了塔架的破坏形态、杆件承载力与位移变化关系.研究结果表明,单支座竖向位移(地表不均匀沉降)是一种比较危险的状况,在位移荷载较小时塔架即丧失了稳定性;除单支座施加竖向位移荷载的工况外,可以认为在支座位移为根开的5%以内,杆件均不会达到屈服荷载;塔架支座受压缩作用比受拉伸作用更危险.A typical transmission tower in subsidence area was analyzed by numerical method, and the influence regularities of ground deformation on internal force and structure deformation of the tower were studied. As a result, the relationship among failure forms, bearing strength and offset variable was obtained. The result indicates that, when a single support is applied vertical downward displacement （nonuniform ground settlement） , the tower losts stability when the displacement is very small, thus this kind of displacement load is the most dangerous one. If the supports are applied other displacement loads, all the bars do not yield unless the displacements of supports beyond 5% of the distance between two supports. The result also indicates that, supports applied compression displacements are more dangerous than supports applied tension displacements.

关 键 词：塌陷区 地表变形 输电铁塔 内力 变形 

分 类 号：TD823.83[矿业工程—煤矿开采]