This website includes a report on a NEES payload shake table test of an equipment isolation system. The report includes: sensor configuration, channel tags, time steps, units, time history plots, matlab functions for parsing the recorded test data,... (more)

This website includes a report on a NEES payload shake table test of an equipment isolation system. The report includes: sensor configuration, channel tags, time steps, units, time history plots, matlab functions for parsing the recorded test data, objectives, and official outcomes. Tab-delimited ASCI data of recorded time histories are available for download. Video of the tests has also been uploaded and will soon be available for download. This payload test was part of the NEES shake-table testing phase of the project entitled "GOALI: Development of a Seismic Design Methodology for Precast Floor Diaphragms (DSDM)" (Award NSF-CMS 0324522).

In order to mitigate the seismic risk posed to shock and vibration-sensitive equipment, isolation systems have been installed within hundreds of data centers, hospitals, and emergency response centers. During near-fault ground motions (such as ground motions with a long-period velocity pulse) the displacement demand on the isolators are likely to result in the isolation system rolling beyond its limits and could result in impacts or the toppling of equipment. Current seismic qualification standards for equipment protection systems do not require long-period excitation. For these reasons, the current level of seismic risk to isolated equipment in hospitals, data centers, and emergency response facilities is virtually unknown. The Large High-Performance Outdoor Shaking Table (LH-POST) at the UCSD-NEES equipment site is one of the only facilities in the world capable of exerting the long-period high-velocity motions required to assess the behavior of rolling isolation systems under near-fault conditions. Experiments at LH-POST on a precast concrete structure, carried out in May 2008, provided a unique opportunity to assess the true seismic vulnerability of the EIS's to near-fault effects. (hide)

Equipment	Component	Equipment Class	Facility
Large High Performance Outdoor Shake Table (LHPOST)	Concrete Reaction Mass	Reaction System	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Horizontal Actuators	Hydraulic Actuator	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	NI DAQ	DAQ Infrastructure	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Platen Yaw Restraint	Shaking Table System	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Shake Table Controller	Other Utilities	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Sony EVI-D30	Camera	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Vertical Pressure Balance Bearings	Hydraulic Actuator	University of California, San Diego
Large High Performance Outdoor Shake Table (LHPOST)	Video System	Other Utilities	University of California, San Diego

Bryce Dickinson; Henri P Gavin, "A Parametric Statistical Generalization of Uniform-Hazard Earthquake Ground Motions" (view)

Henri P Gavin; Bryce Dickinson, "Generation of Uniform-Hazard Earthquake Ground Motions" (view)

view

view

Additional photos (view)

Experiment

Comments