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为探究玻璃纤维增强复合材料(GFRP)输电桁架塔的结构整体受力性能,对1个采用GFRP的220 k V输电桁架塔足尺模型开展试验。该输电桁架塔高8.75 m,由高1.25 m的钢质地线支架和高7.5 m的GFRP塔身以及GFRP横担组成。通过钢丝绳和反力墙对桁架塔进行加载,模拟该结构在3种不同设计荷载工况作用下的受力情况。试验结果表明:GFRP桁架塔在各荷载工况作用下产生了较大的弹性变形,而结构中各杆件的应力值均较小,在最不利荷载工况作用下的最大应力远低于材料的强度设计值。这表明,GFRP输电桁架塔的整体受力性能良好,可以满足输电工程的设计使用要求。
In order to explore the overall mechanical performance of GFRP transmission truss tower, a full-scale model of 220 kV transmission truss tower with GFRP was tested. The transmission truss tower is 8.75 m high and consists of a 1.25 m high steel ground support and a 7.5 m high GFRP tower with a GFRP cross arm. The truss tower was loaded with steel wire rope and reaction wall to simulate the force condition of the structure under three different design load conditions. The test results show that the GFRP truss tower has a large elastic deformation under various load conditions and the stress values of all the members in the structure are small. The maximum stress under the most unfavorable load conditions is much lower than that of the material The strength of the design value. This indicates that the overall force performance of GFRP transmission truss tower is good, which can meet the design and application requirements of transmission projects.