Comparative assessment of nonlinear static and dynamic methods for analysing building response under sequential earthquake and tsunami
Comparative assessment of nonlinear static and dynamic methods for analysing building response under sequential earthquake and tsunami
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用于分析连续地震和海啸下建筑响应的非线性静态和动态方法的比较评估
DOI：
10.1002/eqe.3167
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发表时间：
2019
影响因子：
4.5
通讯作者：
M. Baiguera
中科院分区：
文献类型：
--
作者：
T. Rossetto;Camilo De la Barra;C. Petrone;J. C. de la Llera;J. Vásquez;M. Baiguera
本文对评估建筑物在连续地震和海啸作用下性能的不同动态法和静力法进行了综合比较。以日本10层钢筋混凝土抗震设计的垂直疏散结构为例进行了研究。案例研究建筑首先在连续地震和海啸的非线性反应历史分析下进行评估：这在文献中是第一次。然后将所得到的工程需求参数与通过用不同的静力方法来代替地震和海啸加载阶段的非线性反应历史分析而系统地简化分析过程所获得的参数进行了比较。对于采用地震推覆的情况，还对不同的卸荷方式进行了试验。结果表明，地震非线性反应时程分析、瞬时自由振动和海啸变深度Pushover分析在精度和计算效率方面是完全动力分析的最佳选择。这种结构分析组合是推荐的，其优点是它不需要预先知道海啸淹没时间历史。相反，建议的双推方法被认为只适用于常规中低层建筑的倒塌评估和倒塌易损性函数的开发。一个重要的观察结果是，当对顺序加载进行完全动力分析时，持续地震破坏似乎不影响案例研究建筑的抗海啸能力。这一观察结果将成为今后工作的主题。
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.