输电塔角钢构件加固性能试验与有限元对比研究

Comparative study on reinforcement performance of angle steel members of transmission tower based on experimental and finite element analysis

为研究不同加固方式对输电塔角钢主构件极限承载力的影响,给老旧角钢输电塔加固提供技术支持。提出针对输电塔主材夹具式和穿孔式2种加固形式,分别通过静载试验和参数化有限元模拟,研究不同加固方式、加固位置、连接件间距等参数下加固构件的破坏形态、承载力大小以及加固效果,并分析构件加固机理。研究结果表明:有限元模拟结果与试验结果吻合良好,极限承载力和破坏形态与试验结果相近;加固改变原构件的破坏形态,从整体失稳转变为局部失稳;加固构件两端连接,承载力提高约7%~8%,而增加中间连接后其加固效果比两端连接提升1倍。2种加固方式均能有效提高构件承载力,中间位置增设连接件可使承载力提高更为显著。

In order to provide technical support to the reinforcement for old angle steel transmission towers,studies of the effects on the ultimate bearing carrying capacity of angle steel leg member under different reinforcement methods were conducted.In this paper,two main reinforcement methods of fixture and perforation types for angle steel leg member were proposed.The failure mode,bearing capacity and reinforcement effect of reinforced members are studied under different reinforcement methods,reinforcement positions and connector spacing by static load test and parametrization finite element simulation,and then the reinforcement mechanism of members is analyzed.The results show that:the finite element simulation results are in good agreement with the test results,the ultimate bearing capacity and damage pattern are similar to the test results.The reinforcement changes the damage pattern of the original member,from overall instability to local instability.The bearing capacity is increased by about 7%~8%when the two ends of the reinforced member are connected,and the reinforcement effect is doubled after the middle connection is added.Both types of reinforcement are effective in increasing the bearing capacity of the elements,and with the addition of intermediate joints increasing the bearing capacity even more significantly.