高压输电塔-线体系振动台模型非等比例问题研究

摘要

高压输电塔-线体系模型进行振动台试验时,由于模型跨度大以及实验室尺寸等条件限制,输电塔-线体系中塔与线的比例因子很难保持相同,此时需要将导(地)线的比例进行修正.从数值分析的角度出发,以辽宁盖州500kV输电线路的一段输电塔-线体系为例,输电塔的比例保持不变,导(地)线的修正系数分别取为1.0、0.5和0.4的情况下进行纵向和侧向下的一致和多点地震响应时程分析.研究结果表明,导(地)线的比例进行修正后,输电塔-线体系的地震响应与原模型保持一致,因此这种修正模型的振动台试验的精度满足工程要求.%Because of large span of model and limitation of laboratory size, it is difficult to keep tower and line with same scaling factor when shaking table testing of a power transmission tower-line system is conducted, and it is needed to modify scaling factor of line. With numerical analysis and based on a 500kV transmission system of Gaizhou city in Liaoning province, the modified scaling factor of its line was taken as 1.0, 0. 5 and 0. 4, the scaling of its tower was unchanged, and the longitudinal and transverse seismic responses of the model were obtained under uniform and multiple excitations, respectively. The results showed that the seismic responses of the modified model of the transmission tower-line system keep the same as those of the original model, and the precision of the shaking table testing of the modified model meets the engineering requirements.