【摘要】 为了研究地震动非平稳性对高压输电塔-线体系的地震响应,通过引入均匀调制函数,建立了高压输电塔-线体系非平稳随机地震反应的求解方法.由于地面加速度功率谱采用精细积分的格式,因此计算效率和精度都得到了提高.通过对某220kV高压输电塔-线体系进行地震响应分析,计算了平稳与非平稳随机激励下输电塔和导线的内力及位移反应.计算结果表明:考虑非平稳因素可使导线位移反应增大14.9%～26.8%,导线轴力增大14.9%～48.1%,输电塔的弯矩反应增大8.0%～13.5%.在非平稳随机激励下,考虑行波效应和部分相干效应会使导线的位移和轴力反应明显增大,因此,计算高压输电塔-线体系的地震响应必须考虑地震动非平稳性.更多还原

【Abstract】 In order to study the seismic response of high voltage transmission tower-line system subjected to non-stationary ground shake,the solving method for the non-stationary stochastic seismic responses of high voltage transmission tower-line system was established through introducing the uniform modulation function. Due to the precise integration is utilized for calculating the power spectrum density,the computational efficiency and precision have been remarkably improved.Through performing the seismic responses analysis for a 220 kV high voltage transmission tower-line system,the displacement and internal force of tower and wire under both stationary and non-stationary stochastic excitations were calculated.The calculation results show that with considering the non-stationary factors,the longitudinal displacement of wire will increase by 14.9% to 26.8%,the axial force of wire will increase by 14.9%to 48.1%,and the bending moment of tower will increase by 8.0%to 13.5%.Under the non-stationary stochastic excitation,the displacement and axial force of wire will significantly increase with considering the traveling wave effect and partial coherence effect.Therefore,the nonstationarity of ground shake must be considered in calculating the seismic response of high voltage transmission tower-line system.更多还原