超高电视塔结构的动力弹塑性地震反应控制分析

Elasto-plastic Dynamic Seismic Response Control Analysis of Super High-rising TV Tower

分别采用反应谱分析法、弹性时程分析法和基于塑性铰模型的弹塑性动力分析法对320 m高的宁夏电视塔结构在多遇和罕遇地震作用下进行了抗震分析;并在此基础上,对装置非线性粘滞阻尼器(Nonlinear Viscous FluidDamper,NVFD)的电视塔结构进行了减震控制分析。结果表明,装置NVFD后的电视塔结构在多遇地震作用下的层间位移角小于其限值,而在罕遇地震作用下的弹塑性层间位移角在刚度突变处大于其限值,经过局部调整后,弹塑性层间位移角满足规范要求。因此,经过局部调整后的电视塔结构达到了"三水准"的抗震设防性能目标;且装置NVFD后,结构的层间位移满足规范要求,塑性铰数量明显减少,减震效果明显。

The paper introduces the seismic-resistance analysis of the 320m high Ningxia TV tower under the frequent and rare earthquake using the response spectral analysis,the elastic time history analysis method and the elasto-plastic dynamic analysis based on the plastic hinge model.Then,the shock absorption of the TV tower equipped with NVFD is analyzed.The result indicates that the inter-story drift ratio of the TV tower with NVFD under the frequent earthquakes is less than the limit value,while the elasto-plastic inter-story drift ratio under the rare earthquakes is greater than the limit value where the rigidity changes abruptly.After the minor adjust-ment,the inter-story drift ratio satisfies the requirements.Therefore,the performance of the TV tower after the adjustment meets the ＂three-level＂ in the seismic-resistance target.Equipped with NVFD,the inter-story drift ratio meets the requirement,the number of the plastic hinge of the structure is obviously decreased,and the ef-fect in shock absorption is evident.