摘要
为方便安装,输电铁塔螺孔直径一般要求比螺杆直径大1.5 mm,螺栓受力后存在滑移现象。现行的铁塔设计软件一般采用空间桁架模型进行分析,未考虑螺栓滑移影响,不能准确反映输电铁塔实际变形情况,导致变形计算值一般远低于实测值,进而影响到结构内力分析的准确性和安全性。目前关于螺栓滑移对变形的影响主要是通过有限元软件结合弹簧等单元进行分析,由于输电铁塔杆件较多,结构复杂,这种处理方式效率较低,一般仅用于真型试验的验证分析。考虑螺栓滑移和残余变形影响,基于虚功原理对铁塔变形计算公式进行改进和优化,总结影响螺栓滑移变形大小的关键因素,提出各类节点模型快速识别方法。同时首次对牦牛造型景观塔变形开展足尺真型试验研究,并对试验结果、理论计算值和改进公式计算值进行多工况对比分析,验证改进公式的有效性。此外,根据分析结果和影响因素,提出减少螺栓滑移变形的措施。研究成果对铁塔结构优化设计、变形控制和滑坡、沉降等地基变形情况下的承载力评估具有一定的参考价值。
For the convenience of installation,the bolt hole diameter in the transmission tower is generally required to be 1.5 mm larger than the diameter of the bolt,and there is sliding phenomenon after the bolt is subjected to force.The current tower design software generally uses a spatial truss model for analysis,without considering the influence of bolt slip,which cannot accurately reflect the actual deformation of transmission towers.As a result,the calculated deformation values are generally much lower than the measured values,which affects the accuracy and safety of structural internal force analysis.At present,the analysis of the impact of bolt slip on deformation is mainly carried out through finite element software combined with spring elements.Due to the large number of transmission tower members and complex structure,this processing method has low efficiency and is generally only used for verification analysis of tests.Based on the principle of virtual work,considering bolt slip and residual deformation,the calculation formula for tower deformation is improved,and fast identification methods for various joint models are proposed.At the same time,a full-scale real type experimental study was conducted for the deformation of the yak shaped landscape tower for the first time,and the experimental results,theoretical calculation values,and improved formula calculation values were compared and analyzed to verify the effectiveness of the improved formula.In addition,the measures to reduce bolt slip deformation are proposed.The research results have certain reference value for the optimization design of transmission tower,deformation control,and evaluation of bearing capacity under foundation deformation conditions such as landslides and settlements.
作者
廖邢军
何松洋
何文俊
刘洪昌
LIAO Xingjun;HE Songyang;HE Wenjun;LIU Hongchang(Southwest Electric Power Design Institute Co.,Ltd.of CPECC,Chengdu 610056,China)
出处
《科技和产业》
2025年第15期88-94,共7页
Science Technology and Industry
基金
国家电网公司科技项目(SGXZJG00JCWT2200083)。
关键词
景观塔
螺栓滑移
结构变形
真型试验
虚功原理
landscape tower
bolt slip
structure deformation
full-scale test
virtual work principle
作者简介
廖邢军(1987-),男,四川宣汉人,硕士,高级工程师,研究方向为输电线路勘察设计与施工;何松洋(1995-),男,贵州铜仁人,硕士,工程师,研究方向为输电线路结构计算理论和设计技术;何文俊(1986-),男,四川广元人,工程师,研究方向为输电铁塔和基础设计;刘洪昌(1987-),男,山东新泰人,高级工程师,研究方向为输电线路设计和管理。
