输电塔增高的偏心墩试验及数值方案研究

Experimental and numerical study on eccentric piers for higher transmission towers

基于实际工程,解决输电塔增高的问题,在满足安全可靠的情况下尽可能减少工程量以及能源损耗,采取了原位升高输电塔的方法。对输电塔偏心墩进行设计以及试验分析,最终确定了两种结构的偏心墩方案。对预制的偏心墩进行了加载试验以研究其整体稳定性以及重点关注的螺杆受力状态。同时对直坡塔腿进行方案设计以及ABAQUS有限元分析。模型与实际试验尺寸一致,对螺杆的受力状态进行提取分析,试验结果以及数值计算结果表明,对于采用的两种偏心墩结构方案,有限元分析结果以及试验结果较为吻合;通过两种塔腿受力状态对比,发现直坡塔腿部分采用角钢较为合理,能满足实际工程需求。

Based on the actual project,this paper solves the problem of increasing the height of the transmission tower,reduces the engineering quantity and energy loss as much as possible under the condition of meeting safety and reliability,and adopts the method of raising the transmission tower in situ.The eccentric pier design and test analysis of the transmission tower are carried out,and the eccentric pier schemes of the two structures are finally determined.Loading tests on prefabricated eccentric piers were carried out to study their overall stability and the stress state of the screw rod which was the focus.At the same time,the scheme design and ABAQUS finite element analysis are carried out for the straight slope tower legs.The model is consistent with the actual test size,and the force state of the screw is extracted and analyzed.The test results and numerical calculation results show that for the two eccentric pier structure schemes,the finite element analysis results and test results are relatively consistent;through the two tower legs comparing the stress state,it is found that the use of angle steel for the legs of the straight slope tower is more reasonable and can meet the actual engineering needs.