【摘要】 为提高交流特高压输电线路的安全稳定性,计算分析了我国第一基1000kV交流特高压输电线路试验塔ZM2。通过该塔结构线性与几何非线性静力分析及动力特性分析,并结合真型塔试验,验证了该铁塔设计的可靠性,还对该铁塔在控制工况下的破坏过程进行分析。结果表明:ZM2试验塔结构数值分析结果与试验结果基本一致,数值分析可以很好地模拟结构荷载行为;该试验塔结构性能良好,能满足设计要求;ZM2塔结构几何非线性不明显,设计分析时可不考虑其结构非线性问题;塔身瓶口是ZM2铁塔的薄弱部位,应加强这一部位的设计分析。更多还原

【Abstract】 The suspension tower type ZM2 is the first experimental tower for 1 000 kV ultra-high-voltage(UHV)AC,and will serve the first UHV overhead transmission line in China.Because of the heavier electrical and mechanical load,the UHV towers are higher than the extra-high-voltage(EHV)towers,the structural safety and reliability are critical for these transmission lines.The structural performances of ZM2 are investigated by numerical simulation and experimental test in this paper.Firstly,the static and dynamic behaviors of the experimental tower type ZM2,which was designed according to the limit state method,are calculated by employing the finite element method considering geometrically nonlinear behavior.Then,the experimental tests are conducted under various typical load cases.The simulated structural performances are verified and the structural failure modes are investigated by full-scale test at the Tower Test Station in Beijing.The calculated results from finite element analysis are very reasonable comparing with the code-based and experiment-based ones.According to the tower destructive test,the failure mode and ultimate capacity under the 60 wind load case reveal that the weak part of ZM2 is around the tower bottleneck.Through the static structural analysis of linear and geometrical nonlinear and the dynamic analysis of fundamental vibration characteristic,associating with the results of full-scale testing,it is proved that the design of Chinese UHV steel tower is reliable.By the process of destruction test under the control load case,it is indicated that the results of the numerical analysis are related with those of tests,and the numerical analysis can well simulate the structure responses.From the above studies,it can be concluded that the ZM2has a good structural bearing performance,and the practical engineering needs can be satisfied;the geometrical nonlinear of ZM2 is not obvious,so the effect of geometrical nonlinear can be neglected during the tower designing.The bottleneck of tower ZM2 should be designed and strengthen elaborately.更多还原