The newly constructed tallest building in California, the 73-story Wilshire Grand in Los Angeles, California, is designed in conformance with performance-based design procedures. The building is designed with concrete core–shear walls, three outriggers with buckling restrained braces (BRBs) located along the height, and two three-story truss-belt structural systems. The building is equipped with a 36-channel accelerometric seismic monitoring array that recorded the recent Mw7.1 Ridgecrest earthquake of 5 July 2019, as well as the Mw6.4 Ridgecrest earthquake of 4 July 2019. In this article, only the Mw7.1 event of 5 July 2019 is studied because of a larger response of the subject building during that earthquake. The earthquake records of 5 July 2019 are specifically studied to determine its dynamic characteristics and building-specific behavior. The structure exhibits torsional behavior most likely due to abrupt asymmetrical changes in the thickness and size in-plan of the core–shear walls. The translational and torsional modes during the earthquake are not closely coupled, which does not lead to a beating effect even though there is an appearance of it in the records. Available ambient records are used only to identify modal frequencies of the building and compare them with those from the Mw7.1 event of 5 July 2019. Due to the relatively low amplitude of shaking during the earthquake, the drift ratios are too small to cause any damage. It is expected that during stronger shaking levels likely to be caused by future events, these characteristics may change and the effect of BRBs can be better assessed.

中文翻译：

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根据 2019 年 7 月 5 日加利福尼亚州 Mw7.1 Ridgecrest 地震和环境运动推断出的最高加利福尼亚建筑的响应研究

加利福尼亚州新建的最高建筑，加利福尼亚州洛杉矶的 73 层威尔希尔大酒店，其设计符合基于性能的设计程序。该建筑设计有混凝土核心剪力墙、三个沿高度布置的带屈曲约束支撑 (BRB) 的支腿和两个三层桁架带结构系统。该建筑配备了一个 36 通道加速度计地震监测阵列，记录了最近的 2019 年 7 月 5 日的 Mw7.1 Ridgecrest 地震，以及 2019 年 7 月 4 日的 Mw6.4 Ridgecrest 地震。在本文中，仅记录了 Mw7.1 2019 年 7 月 5 日的事件之所以被研究，是因为该地震期间主题建筑的响应更大。专门研究了 2019 年 7 月 5 日的地震记录，以确定其动态特性和特定于建筑物的行为。该结构表现出扭转行为最有可能是由于芯-剪力墙的平面内厚度和尺寸的突然不对称变化。地震过程中的平移和扭转模式不是紧密耦合的，即使在记录中出现了跳动效应，也不会导致跳动效应。可用的环境记录仅用于识别建筑物的模态频率，并将其与 2019 年 7 月 5 日 Mw7.1 事件的频率进行比较。由于地震期间的震动幅度相对较低，漂移比太小，不会导致任何损害。预计在可能由未来事件引起的更强震动水平期间，这些特征可能会发生变化，并且可以更好地评估 BRB 的影响。