超高压输变电钢管构架加固技术的研究与应用

Study and application of a reinforcement technique of steel-tube truss for ultra-high voltage power transmission

通过11根薄壁钢管柱外粘钢板加固后的轴心抗压试验,对超高压输变电钢管构架采用外粘钢板加固后的受力性能进行研究,试验结果表明:外粘钢板能与原钢管有效地联合工作,显著提高原钢管柱的刚度和承载力,增强其稳定性。在试验研究的基础上,通过理论分析,提出外粘钢板加固钢管柱的加固设计方法,推导加固后复合体系整体刚度的计算公式,并采用有限元方法对外粘钢板加固钢管柱的受力性能进行数值模拟分析,进一步验证试验研究和理论分析的正确性。同时结合实际工程应用,提出有效可行的施工方案,解决外粘钢板在构架基础上锚固的问题。研究成果可为大量需要进行加固处理的输变电钢管构架以及其他类似结构工程加固提供参考。

Eleven steel tubular columns strengthened by sticking steel plates （or stiffeners） on the outer surfaces of the columns and these members were tested by axial-compression to determine their structural performances. The test results show that the stiffness, stability and ultimate bearing capacity of the steel pipe columns can be improved greatly due to the combined work between the stiffener and the thin-wall steel tube. Based on the experimental results, the design methods of reinforcement and formulas for the composite structural stiffness were proposed. Furthermore, the finite element method was used to simulate the behavior of steel pipe reinforced by the stiffener, and the experimental measurements appeared to support the analysis performed. An effective technique for construction of plate stiffener connecting with the foundation was also introduced through engineering applications. Present research findings can provide a useful reference for applications to other similar engineering projects.