Identifying damage mechanisms of gymnasium structure damaged by the 2011 Tohoku earthquake based on biaxial excitation
Identifying damage mechanisms of gymnasium structure damaged by the 2011 Tohoku earthquake based on biaxial excitation
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DOI：
10.1016/j.istruc.2021.11.010
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发表时间：
2021-11
期刊：
影响因子：
4.1
通讯作者：
A. Suzuki;Tomomi Fujita;Y. Kimura
中科院分区：
文献类型：
--
作者：
A. Suzuki;Tomomi Fujita;Y. Kimura
在2011年东北大地震中，体育馆建筑遭受了意想不到的结构破坏，无法用作疏散避难所。本研究探讨了这样一个严重损坏的结构，钢屋顶和钢筋混凝土柱之间的连接较少。特征值，推覆和地震反应分析的结果阐明了观察到的结构损伤。由于柱顶约束较小，平面外变形突出，柱脚破坏严重。此外，峰值地面加速度的参数研究表明，双轴激励产生不同的破坏模式的柱顶部连接从单轴激励下。此外，破坏机制的变化是由具有广泛的频率特性的各种地震运动证明。Pushover分析结果证明了初始连接失效的可预测性。然而，推覆和地震反应分析的结果之间的差异变得更大，随后的连接失败。基于单轴Pushover和地震反应分析可以准确地评估柱脚损伤。
During the 2011 Tohoku Earthquake, gymnasium buildings sustained unexpected structural damage, preventing their use as evacuation shelters. This study examines one such severely damaged structure with fewer connections between the steel roof and reinforced concrete columns. Results of eigenvalue, pushover, and seismic response analyses elucidate the observed structural damage. The out-of-plane deformation is prominent because of the slight constraint at the column top, leading to severe damage at the column base. Moreover, a parametric study of the peak ground acceleration suggests that the biaxial excitation produces different failure modes of column top connections from those under uniaxial excitation. Moreover, variation of the failure mechanisms is evidenced by the variety of seismic motions with a broad range of frequency characteristics. Pushover analysis results demonstrated the predictability of initial connection failure. However, discrepancies between results of the pushover and seismic response analyses became greater with subsequent connection failures. The column base damage can be assessed accurately based on uniaxial pushover and seismic response analyses.