±800 kV特高压直流穿墙套管抗震性能研究

Study on Seismic Performance of ±800 kV Ultra-high Voltage DC Wall Bushing

为评估某工程800 kV特高压直流复合穿墙套管的抗震性能,在有限元软件ABAQUS中建立复合穿墙套管和全钢阀厅的整体模型,并通过计算获得了复合穿墙套管设备在地震作用下的加速度、应力和位移响应。研究发现:穿墙套管底部的阀厅结构对地面运动的加速度峰值有一定的放大作用,放大系数在1.5~3.0之间。复合穿墙套管在0.4 g加速度峰值的地震波作用下其根部应力处于容许应力范围内,但套管顶部的位移达到86~96.7 mm。对于复合穿墙套管设备,应结合支撑结构阀厅的放大作用及复合套管的应力和位移响应综合判定其抗震性能。

In order to evaluate the seismic performance of a type of 800 kV ultra-high voltage direct current composite wall bushing, the whole model of the composite wall bushing and steel valve hall is established through the finite element software ABAQUS. The stress, acceleration and displacement responses of the composite wall bushing under seismic action are obtained through calcualtion. The study found that the valve hall structure at the bottom of the wall bushing has certain amplification effect on the peak acceleration of ground motion, and the amplification factors are among 1.5~3.0. The root stress of the composite wall bushing is within the allowable stress range under the input of seismic waves with 0.4 g PGA, but the displacement almost reaches 86~96.7 mm. For comprehensively evaluating the seismic performances of composite wall bushing, it should combine the amplification effect of the valve hall and the stress and displacement responses of composite wall bushing.