一种基于增量动力分析法的高耸混凝土电视塔结构整体损伤模型

A global damage index for a high-rise concrete TV tower based on the incremental dynamic analysis

由于缺乏多道抗震防线,高耸混凝土电视塔结构在地震作用下易发生破坏,评估结构在经历地震作用后的损伤状态对于评价结构的抗震性能以及震后可恢复性能具有重要意义。基于增量动力分析(incremental dynamic analysis,IDA)法,使用IDA曲线围成面积的比值定义了一种新的整体损伤模型;介绍结构损伤状态判定原则以及地震动强度指标的选取方法,并证明了该研究提出的整体损伤值随着地震动强度指标值的增加而单调递增的特性;以北京中央电视塔为对象,研究该损伤模型和其他损伤模型对高耸混凝土电视塔结构的适用性。研究结果表明,该研究提出的模型解决了其他模型的损伤演化曲线局部下降问题;此外,该模型的损伤演化曲线形状特点较符合电视塔结构的脆性破坏特点。

Due to the lack of multi-seismic defense lines,high-rise concrete TV tower structures are easy to be damaged under earthquake.Evaluation of the damage state of the structures after earthquake is of great significance to evaluate the seismic performance and recoverability of the structures after earthquake.In this paper,a new global damage model,defined by the ratio of the area enclosed by the incremental dynamic analysis(IDA)curves,based on the incremental dynamic analysis IDA method was proposed.The principle of structural damage state and the selection method of ground motion intensity measure were introduced,and it was proved that the overall damage value proposed in this paper increases monotonously with ground motion intensity measure.Taking the Beijing CCTV Tower as an object,the applicability of the damage model and other damage models to the structure of high-rise concrete TV tower was studied.Results show that the model proposed in this paper solves the problem of local decline of damage evolution curves of other models.In addition,the shape characteristics of damage evolution curves of this model are more consistent with the brittle failure characteristics of the TV tower structure.