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Comparative assessment of nonlinear static and dynamic methods for analysing building response under sequential earthquake and tsunami

机译：连续地震和海啸中用于分析建筑物响应的非线性静态和动态方法的比较评估

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摘要

This paper presents a comprehensive comparison of different dynamic and static approaches for assessing building performance under sequential earthquakes and tsunami. A 10-storey reinforced concrete seismically designed Japanese vertical evacuation structure is adopted as a case study for the investigation. The case study building is first assessed under sequential earthquake and tsunami nonlinear response history analyses: the first time this is done in the literature. The resulting engineering demand parameters are then compared with those obtained when the analysis procedure is systematically simplified by substituting different static approaches for the nonlinear response history analyses in both the earthquake and tsunami loading phases. Different unloading approaches are also tested for the cases when an earthquake pushover is adopted. The results show that an earthquake nonlinear response history analysis, followed by a transient free vibration and a tsunami variable depth pushover, provides the best alternative to full dynamic analyses in terms of accuracy and computational efficiency. This structural analysis combination is recommended and has the advantage that it does not require the tsunami inundation time history to be known in advance. The proposed double pushover approach is instead deemed only suitable for the collapse assessment of regular low to mid-rise buildings and for the development of collapse fragility functions. An important observation made is that sustained earthquake damage seems not to affect the tsunami resistance of the case study building when the fully dynamic analysis is carried out for the sequential loading. This observation will be the subject of future work.
机译：本文对连续地震和海啸下评估建筑物性能的不同动态和静态方法进行了全面比较。以10层钢筋混凝土抗震设计的日本垂直疏散结构为研究案例。首先在连续地震和海啸非线性响应历史分析下评估案例研究建筑物：这是文献中的第一次。然后，将所得的工程需求参数与通过将不同的静态方法替换为地震和海啸加载阶段的非线性响应历史分析来系统简化分析程序时获得的参数进行比较。对于采用地震推覆的情况，还测试了不同的卸货方法。结果表明，地震非线性响应历史分析，瞬态自由振动和海啸可变深度推覆之后，就准确性和计算效率而言，是全动态分析的最佳替代方法。建议使用这种结构分析组合，其优点是不需要预先知道海啸淹没的时间历史。相反，建议的双侧推方法仅适用于常规低至中层建筑的倒塌评估以及倒塌脆弱性功能的开发。一个重要的观察结果是，当对顺序荷载进行全动态分析时，持续的地震破坏似乎不会影响案例研究建筑物的抗海啸能力。这种观察将成为未来工作的主题。

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