Damage to elevated water tanks in past earthquakes can be attributed to the poor performance of their supporting frame staging. In order to ascertain the performance of these elevated water tanks, it is crucial to categorize the damage in quantifiable damage states. Among various parameters to quantify the damage states, the top drift of frame staging can be conveniently correlated to the different damage levels. In literature, drift limits corresponding to different damage states of the frame staging of the elevated water tank are not available. In the present study, drift limits for RC frame staging in elevated water tanks corresponding to different seismic damage states have been proposed. Various damage states of the elevated water tank have been determined using the Park and Ang damage index. The Park and Ang damage index utilizes results of both pushover analysis and incremental dynamic analysis. Twelve models of elevated water tanks have been developed considering variation in staging height and tank capacity. Incremental dynamic analysis has been performed using the suite of twelve actual earthquake ground motions. Based on the regression analysis between damage indexes and drift, limiting drift values for each damage state are proposed.

中文翻译：

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利用Park和Ang损伤指数估算高架水箱RC框架阶段地震破坏状态的漂移极限。

在过去的地震中，水箱的损坏可能是由于其支撑架的性能不佳所致。为了确定这些高位水箱的性能，至关重要的是将损害分类为可量化的损害状态。在量化损伤状态的各种参数中，可以将帧分段的顶部漂移方便地与不同的损伤级别相关联。在文献中，没有对应于高架水箱框架分级的不同损坏状态的漂移极限。在本研究中，已经提出了对应于不同地震破坏状态的高架水箱中钢筋混凝土框架分段的漂移极限。高水箱的各种损坏状态已通过Park和Ang损坏指数确定。帕克和昂格损伤指数利用推覆分析和增量动态分析的结果。考虑到分段高度和水箱容量的变化，已经开发了十二种高架水箱模型。使用十二个实际地震地震动套件进行了增量动力分析。基于损伤指数与漂移之间的回归分析，提出了每种损伤状态的极限漂移值。