输电角钢塔内嵌式十二地螺上拔计算理论研究  

Theoretical Study on Uplift Calculation of Embedded Twelve Ground Screws of Transmission Angle Steel Tower

作　　者：何松洋 鄢秀庆 李正良[2,3] 刘翔云 李钟 龚涛 HE Songyang;YAN Xiuqing;LI Zhengliang;LIU Xiangyun;LI Zhong;GONG Tao(Southwest Electric Power Design Institute Co.,Ltd.,China Electric Power Engineering Consulting Group,Chengdu 610021,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,四川成都610021 [2]重庆大学土木工程学院,重庆400045 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《西南交通大学学报》2024年第6期1406-1414,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(51508054)。

摘　　要：为解决输电角钢塔大荷载作用下的地螺连接问题,提出一种内嵌式十二地螺节点结构.基于刚度差异演化的塑性屈服线理论,考虑地螺位置、地螺与塔脚板刚度差异的影响,推导出上拔荷载作用下内嵌地螺与外地螺内力不均匀计算的理论公式;然后,结合24组精细化数值分析,研究不同地螺直径、地螺间距和塔脚板厚度对内、外地螺上拔内力差异的影响,并对其刚度差异修正系数进行标定;最后,通过72组数值试验验证理论公式的合理性.研究结论表明:内嵌式十二地螺结构较传统八地螺结构可以提高节点上拔承载力40%~50%;当内地螺布置在外地螺正交线上时,内、外地螺在上拔荷载作用下的内力不均匀分布系数约为1.1,且不随地螺直径和塔脚板厚度变化;当内地螺沿着对角线靠近外地螺时,内地螺内力的不均匀分布系数减小,但当塔脚板厚度增大时,不均匀分布系数会增大;考虑刚度差异演化的塔脚板塑性屈服线理论的计算结果与数值模拟结果相比,理论不均匀分布系数与数值不均匀分布系数比值的均值为1.01,变异系数为0.03.In order to solve the problem of ground screw connection under large load of transmission angle steel tower,an embedded twelve ground screw joint structure was proposed.Based on the plastic yield line theory of stiffness difference evolution,the influence of the position of ground screws and the stiffness difference between ground screws and tower foot plates was considered,and the theoretical formula of uneven internal force between embedded ground screws and external ground screws under uplift load was derived.Then,combined with 24 sets of refined numerical analysis,the influence of different ground screw diameters,ground screw spacings,and tower foot plate thicknesses on the differences in uplift forces of internal and external ground screws was studied,and the correction coefficient of stiffness difference was calibrated.Finally,the theoretical formula was verified by 72 sets of numerical experiments.The research results show that the embedded twelve ground screw structure can improve the uplift bearing capacity of the joint by 40%–50%compared with the traditional eight ground screw structure;when the internal ground screw is arranged on the orthogonal line of the external ground screw,the uneven distribution coefficient of internal force of the internal and external ground screws under the uplift load is about 1.1,and it does not change with the diameter of the ground screw and the thickness of the tower foot plate.When the internal screw is close to the external screw along the diagonal,the uneven distribution coefficient of the internal force of the internal screw will decrease,but when the thickness of the tower foot plate increases,the uneven distribution coefficient will increase.The calculation results based on the plastic yield line theory of stiffness difference evolution of the tower foot plate are compared with the numerical simulation results.The average value of the ratio of the theoretical uneven distribution coefficient to the numerical uneven distribution coefficient is 1.01,and the coeffici

关 键 词：输电塔结构 内嵌式十二地螺 刚度演化 屈服线理论 计算理论 数值分析 

分 类 号：TM753[电气工程—电力系统及自动化] TM721.1