The NEES@UCSD Large High Performance Outdoor Shake Table

Restrepo, José I.; Conte, Joseph Le; Luco, J. Enrique; Seible, Frieder; Einde, Lelli Van Den

doi:10.1061/40779(158)1

Cited by 14 publications

(3 citation statements)

References 1 publication

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“…Proof-of-concept testing was performed on the 12.2 m long by 7.6 m wide 6.8MN capacity unidirectional outdoor shaketable of the University of California, San Diego, formerly known as NEES@UCSD. 20…”

Section: Test Facilitymentioning

confidence: 99%

“…The slab thickness was not scaled (rather than adding mass) to provide sufficient tributary mass to develop realistic diaphragm forces; a more realistic relationship between gravity load, P-Δ effects, and inertial forces, and, to keep the table accelerations within the operating range. 20 The larger relative thickness of the slab creates a condition where it is difficult to enforce a strong column-weak slab design condition to preclude a story mechanism. For this reason, and for test repeatability, special precast concrete gravity columns (Figure 7) were developed for the structure.…”

Section: Shake-table Specimen Overviewmentioning

confidence: 99%

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Shake‐table test performance of an inertial force‐limiting floor anchorage system

Zhang

Fleischman

Restrepo

et al. 2018

Earthq Engng Struct Dyn

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Summary A new floor connecting system developed for low‐damage seismic‐resistant building structures is described herein. The system, termed Inertial Force‐Limiting Floor Anchorage System (IFAS), is intended to limit the lateral forces in buildings during an earthquake. This objective is accomplished by providing limited‐strength deformable connections between the floor system and the primary elements of the lateral force‐resisting system. The connections transform the seismic demands from inertial forces into relative displacements between the floors and lateral force‐resisting system. This paper presents the IFAS performance in a shake‐table testing program that provides a direct comparison with an equivalent conventional rigidly anchored‐floor structure. The test structure is a half‐scale, 4‐story reinforced concrete flat‐plate shear wall structure. Precast hybrid rocking walls and special precast columns were used for test repeatability in a 22‐input strong ground‐motion sequence. The structure was purposely designed with an eccentric wall layout to examine the performance of the system in coupled translational‐torsional response. The test results indicated a seismic demand reduction in the lateral force‐resisting system of the IFAS structure relative to the conventional structure, including reduced shear wall base rotation, shear wall and column inter‐story drift, and, in some cases, floor accelerations. These results indicate the potential for the IFAS to minimize damage to the primary structural and non‐structural components during earthquakes.

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Section: Test Facilitymentioning

confidence: 99%

Section: Shake-table Specimen Overviewmentioning

confidence: 99%

Shake‐table test performance of an inertial force‐limiting floor anchorage system

Zhang

Fleischman

Restrepo

et al. 2018

Earthq Engng Struct Dyn

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“…Along these lines, a series of full‐scale tests was conducted at the University of California San Diego for the uni‐axial seismic excitation of a 22 m high wind turbine with rated power of 65 kW . Base shaking was imparted perpendicular to the axis of the spinning rotor using the Large High Performance Outdoor Shake Table, which was provided by the Network for Earthquake Engineering Simulation. A limited number of real earthquake motions, scaled in various intensity levels, was used for the seismic excitation, and the main intention was to avoid inducing excessive nonlinear response (and hence severe damages) to the prototype wind turbine.…”

Section: Experimental Evaluation Of Wind Turbine Seismic Responsementioning

confidence: 99%

Wind turbines and seismic hazard: a state-of-the-art review

2016

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Wind energy is a rapidly growing field of renewable energy and as such, intensive scientific and societal interest has been already attracted. Research on wind turbine structures has been mostly focused on the structural analysis, design and/or assessment of wind turbines mainly against normal (environmental) exposures while, so far, only marginal attention has been spent on considering extreme natural hazards that threat the reliability of the lifetime-oriented wind turbine's performance. Especially, recent installations of numerous wind turbines in earthquake prone areas worldwide (e.g., China, USA, India, Southern Europe and East Asia) highlight the necessity for thorough consideration of the seismic implications on these energy harnessing systems. Along these lines, this state-of-the-art paper presents a comparative survey of the published research relevant to the seismic analysis, design and assessment of wind turbines. Based on numerical simulation, either deterministic or probabilistic approaches are reviewed, since they have been adopted to investigate the sensitivity of wind turbines' structural capacity and reliability in earthquake-induced loading. The relevance of seismic hazard for wind turbines is further enlightened by available experimental studies, being also comprehensively reported through this paper. The main contribution of the study presented herein is to identify the key factors for wind turbines' seismic performance while important milestones for ongoing and future advancement are emphasized.

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Model‐based multi‐metric control of uniaxial shake tables

Phillips

Wierschem

Spencer

2013

Earthq Engng Struct Dyn

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SUMMARY Shake tables provide a direct means by which to evaluate structural performance under earthquake excitation. Because the entire structure is mounted on the base plate and subjected to the ground motion in real time, dynamic effects and rate‐dependent behavior can be accurately represented. Shake table control is not straightforward as the desired signal is an acceleration record, while most actuators operate in displacement feedback for stability. At the same time, the payload is typically large relative to the capacity of the actuator, leading to pronounced control‐structure interaction. Through this interaction, the dynamics of the specimen influence the dynamics of the shake table, which can be problematic when specimens change behavior because of damage or other nonlinearities. Moreover, shake tables are themselves inherently nonlinear, making it difficult to accurately recreate a desired acceleration record over a broad range of amplitudes and frequencies. A model‐based multi‐metric shake table control strategy is proposed to improve tracking of the desired acceleration of a uniaxial shake table, remaining robust to nonlinearities including changes in specimen condition. The proposed strategy is verified for the shake table testing of both linear and nonlinear structures. Copyright © 2013 John Wiley & Sons, Ltd.

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The NEES@UCSD Large High Performance Outdoor Shake Table

Cited by 14 publications

References 1 publication

Shake‐table test performance of an inertial force‐limiting floor anchorage system

Shake‐table test performance of an inertial force‐limiting floor anchorage system

Wind turbines and seismic hazard: a state-of-the-art review

Model‐based multi‐metric control of uniaxial shake tables

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