Changes in the Dynamic Characteristics of a Small-Scale Gymnasium Model Due to Simulated Earthquake Damage
Changes in the Dynamic Characteristics of a Small-Scale Gymnasium Model Due to Simulated Earthquake Damage
复制标题
DOI：
10.20965/jdr.2021.p1074
复制
发表时间：
2021-10
影响因子：
0.8
通讯作者：
J. Fujiwara;A. Kishida;Takashi Aoki;R. Enokida;K. Kajiwara
中科院分区：
文献类型：
--
作者：
J. Fujiwara;A. Kishida;Takashi Aoki;R. Enokida;K. Kajiwara
本文通过振动台试验对模拟损伤的小型体育馆模型进行了模态参数评估，研究了大跨度建筑结构损伤评估的可行性。在日本，体育馆等大跨度建筑预计会在自然灾害发生时被用作疏散避难所。由于避难所本身在地震情况下可能会受损，因此在使用避难所之前，确定是否发生了损害、发生在哪里以及损害的严重程度至关重要。根据相似准则设计了小型体育馆。观测到的地震地面运动被应用到余震水平上。由测得的响应加速度得到结构的固有频率和振型。为了研究结构损伤对结构模态参数的影响，还对一个体育馆模型进行了模拟损伤试验。结果表明，由响应加速度可以得到结构的固有频率和振型等模态参数，通过这些参数的变化可以判断结构的损伤模式。
In this study, the authors used shake-table tests to assess the modal parameters of a small-scale gymnasium model with simulated damage, the feasibility of estimating the damage to large-span building structures was studied. In Japan, large-span structures, such as gymnasiums, are expected to be used as evacuation shelters when a natural disaster occurs. As the shelter itself may be damaged in case of an earthquake, it is critical to determine whether damage has occurred, where it occurred, and how serious it is, before the shelter is used. The small-scale gymnasium was designed based on the similarity rule. Observed earthquake ground motions scaled to aftershock levels were applied to the model. The natural frequencies and mode shapes were obtained from the measured response accelerations. To study the influence of structural damage on the modal parameters, a gymnasium model with simulated damage was also tested. The results indicate that the modal parameters, e.g., natural frequencies and mode shapes, can be obtained from the response accelerations, and the damage patterns can be estimated from the changes in these modal parameters.