强震作用下机场高耸塔台结构抗震性能分析

Seismic performance of high-rise control tower of airport under strong earthquake

为提升强震作用下机场高耸塔台结构的抗震性能及安全,采用非线性时程分析方法研究高耸塔台结构的强震损伤分布规律;基于性能化抗震设计方法确定塔台关键构件抗震性能水准,对高耸塔台结构进行性能化抗震设计和损伤控制;最后分析了竖向地震对高耸塔台结构强震损伤的影响。分析得到,采用多遇地震设计的塔台结构,在罕遇地震作用下塔台结构层间位移角满足规范要求,但塔台筒体局部区域处于严重损坏状态;塔台筒体损伤明显区域位于底部及中部;相对上部框架构件而言,罕遇地震作用下筒体是塔台结构的抗震薄弱部位;塔台筒体采用设防地震不屈服性能设计后,筒体局部区域损伤状态由严重损坏降低为中度损坏状态;罕遇地震下竖向地震效应对塔台筒体受拉损伤的影响较受压损伤明显。

To improve the seismic performance and safety of high-rise control towers of airports under severe earthquake,the damage distribution mechanism of the tower structure under strong earthquake was studied by using the nonlinear time-history analysis method.Performance levels of structural key components were determined with the performance-based seismic design method,then the performance-based seismic design and damage control of the tower structure were carried out.Finally,the influence of vertical earthquake on the damage of tower was analyzed.The results indicated that the story drift ratio of the control tower with frequent earthquake design can meet the specification requirements under the action of rare earthquake,while the local area of tower tube is seriously damaged.Compared with upper frame members,the weak part of tower structure under rare earthquake is tower tube.The damage state of local area of the tower tube is reduced from severe damage to moderate damage by using the performance design of non-yielding under fortification earthquakes.The influence of vertical earthquake action on the tensile damage of tower tube is greater than that of compression damage.