ABSTRACT

The dynamic responses of an instrumented twenty-story steel-moment frame office building were identified with the data from mainshock (M 7.1) occurred on November 30, 2018 and its six aftershocks ranging from M4.2 to 5.7 in the Alaska-Aleutian subduction zone. The deconvolution-based seismic interferometry was used to identify the traveling waves and intrinsic-damping ratio in the building. The median shear-wave velocity is 179 m/s for the east-west (EW), 201 m/s for the north-south (NS), and 174 m/s for the torsional responses. The building’s average intrinsic-damping ratio is estimated to be 4.4% and 3.7% for the EW and NS directions, respectively.

摘要

利用 2018 年 11 月 30 日发生的主震 (M 7.1) 及其在阿拉斯加-阿留申俯冲带发生的 6 次余震从 M4.2 到 5.7 的数据，确定了一座仪表化的 20 层钢弯矩框架办公楼的动态响应. 基于反卷积的地震干涉测量法用于识别建筑物中的行波和固有阻尼比。东西向 (EW) 的中值剪切波速度为 179 m/s，南北向 (NS) 为 201 m/s，扭转响应为 174 m/s。建筑物的平均固有阻尼比估计在 EW 和 NS 方向分别为 4.4% 和 3.7%。