Responses of a Tall Building in Los Angeles, California, as Inferred from Local and Distant Earthquakes

Çelebi, Mehmet; Ulusoy, Hasan S.; Nakata, Nori

doi:10.1193/050515eqs065m

Cited by 17 publications

(10 citation statements)

References 28 publications

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“…In addition, in an earlier paper (Çelebi et al, 2016b) studying earthquake responses of a 58-story building, a few blocks away from the Wilshire Grand in downtown Los Angeles also yielded low-site frequency (long period) ∼0.12–0.13 Hz (7.7–8.3 s). These are included herein primarily to draw attention to the basin effect so that future studies of existing and future long-period structures in that area can make use of such similarity and consider basin effects in assessing site effects.…”

Section: Foundation Site Basin Effect and Site Transfer Functionmentioning

confidence: 95%

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Response study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions

et al. 2020

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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.

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Section: Foundation Site Basin Effect and Site Transfer Functionmentioning

confidence: 95%

“…Thanks to seismic structural monitoring projects, long-distance long-period responses of tall buildings severely shaken by events that occur at far distances has been the subject matter of many recent studies (e.g. Çelebi et al, 2014, 2016a, 2016b, 2017a, 2017b; Safak et al, 2014; Skolnik et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Response study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions

et al. 2020

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“…Examples of earthquake and ambient noise waves propagating in this building, as recorded by the dense CSN network, are shown in Clayton et al (2015) and Kohler et al (2016). The performance of the building, including modal frequencies, velocity, and damping variations is described in Celebi et al (2016) and Kohler et al (2016).…”

Section: Example Of a 52-story Buildingmentioning

confidence: 99%

Damage Detection by Template Matching of Scattered Waves

Massari

Clayton

Kohler

2018

Bulletin of the Seismological Society of America

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A method based on template matching is presented to detect and locate damage in buildings following severe shaking by an earthquake. The templates are constructed by finite-element simulations of a suite of damage scenarios, with the solutions evaluated at the location (and orientation) of each sensor in the structure. The damage detection is carried out by cross-correlating the templates with recordings acquired from earthquakes. A dense distributed network of sensors is important for detecting anomalies in the presence of ambient noise. The cross correlation of the templates with themselves provides a measure of the resolution of the damage location.

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“…FEM analyses performed and results obtained by the designers were reviewed in the previous study (Çelebi et al 2013). The methods applied in this paper are similar to those used in analyses of data from several tall buildings in Japan (Çelebi et al 2014, 2016a, 2016b), and the US (Çelebi et al 1993, 2013, 2016c, Çelebi 2016). Such methods provide optimal and efficient results to meet the objectives of similar studies as in this paper.…”

Section: Objectives Of the Current Studymentioning

confidence: 99%

Study of Responses of 64-Story Rincon Building to Napa, Fremont, Piedmont, San Ramon Earthquakes and Ambient Motions

2017

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We analyze the recorded responses of a 64-story, instrumented, concrete core shear wall building in San Francisco, California, equipped with tuned sloshing liquid dampers (TSDs) and buckling restraining braces (BRBs). Previously, only ambient data from the 72-channel array in the building were studied ( Çelebi et al. 2013 ). Recently, the 24 August 2014 Mw 6.0 Napa and three other earthquakes were recorded. The peak accelerations of ambient and the larger Napa earthquake responses at the basement are 0.12 cm/s/s and 5.2 cm/s/s respectively—a factor of ∼42. At the 61st level, they are 0.30 cm/s/s (ambient) and 16.8 cm/s/s (Napa), respectively—a factor of ∼56. Fundamental frequencies (NS ∼ 0.3, EW ∼ 0.27 Hz) from earthquake responses vary within an insignificant frequency band of ∼0.02–0.03 Hz when compared to those from ambient data. In the absence of soil-structure interaction (SSI), these small and insignificant differences may be attributed to (1) identification errors, (2) any nonlinear behavior, and (3) shaking levels that are not large enough to activate the BRBs and TSDs to make significant shifts in frequencies and increase damping.

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Responses of a Tall Building in Los Angeles, California, as Inferred from Local and Distant Earthquakes

Cited by 17 publications

References 28 publications

Response study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions

Response study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions

Damage Detection by Template Matching of Scattered Waves

Study of Responses of 64-Story Rincon Building to Napa, Fremont, Piedmont, San Ramon Earthquakes and Ambient Motions

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