为解决某些输电铁塔因设计时间较早或环境变化等原因已无法满足安全使用要求的问题,文章采用一种使用钢板和抱箍夹具的加固方法对铁塔主柱角钢加固,该方法无需对原塔材拆卸或打孔,且加固效果显著.采用有限元软件ANSYS建立其数值模型,与试验结果进行对比验证.研究该加固方法在某工程双回路直线塔中的加固效果,并对其进行参数分析,考察加固钢板的宽度、厚度、屈服强度及加固钢板与原主柱角钢间的初始间隙等因素对加固效果的影响.结果表明:加固钢板与主柱角钢间的初始间隙对加固效果的影响较为显著,且间隙值越大,承载能力越低.该加固方法施工简便、安全,能有效提升铁塔主柱角钢的极限承载力,可应用于输电铁塔的加固.
Abstract
Some transmission towers, designed under old regulation, fail to meet the new safety requirement/environment. This paper adopted a method to reinforce the main structural members of transmission tower which includes steel plate and fixtures. This method needn’t to punch or disassemble the original tower materials, and shows remarkable effect. The numerical analysis model is made by ANSYS software, and analysis results are compared with experimental results. The effect of this method in the straight-line tower of double circuit was investigated. Influence analysis is made on the width, thickness, yield strength of steel plate and the initial gap between steel plate and angle steel. The result shows that, the effect of initial gap between steel plate and angle steel is relatively remarkable, the greater the gap, the smaller the bearing capacity. This method could be safely, expediently, and effectively applied to the reinforcement of transmission towers.
关键词
输电铁塔 /
抗风 /
加固方法 /
承载力
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Key words
transmission tower /
wind-resistant /
reinforcement method /
bearing capacity
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