Earthquake Simulator Laboratory
Six Degree-of-Freedom Shaking Table
The signature piece of testing equipment at the PEER-UC Berkeley Lab is the Six Degree-of-Freedom Shaking Table, the largest in the United States, and one of the largest in the world. The PEER-UC Berkeley Lab also houses a Large Scale Structures Lab consisting of a 20' x 60' strong floor with an integrated, reconfigurable, modular reaction wall. A comprehensive inventory of both static and dynamic hydraulic actuators, ranging from 5 kips to 2000 kips, along with an inventory of other test hardware and components are available to accommodate both simple single degree of freedom test setups as well as multi-axis custom test configurations. In addition, the PEER-UC Berkeley Lab houses large and small damper test machines, a 200 kip and a 4,000 kip uniaxial load frame, along with all of the associated control, measurement and data acquisition equipment required to operate the Lab's various test machines. The PEER facility also houses a Micro Lab for smaller scale experiments in self-equilibrating testing frames. The PEER-UC Berkeley Lab is at the forefront in the development of both hybrid control and digital image processing for the measurement of continuous strain fields.
Single Degree of Freedom Table
The PEER Single Degree of Freedom Shaking Table has a maximum stroke of +/-20 inches. The platform is 7' x 19'. The payload can be as high as 200 kips, with lateral capacity of 150 kips.
The controller is connected to a SCRAMNet ring buffer; hence, this shaking table is capable of performing real-time hybrid simulation. This platform is ideal for projects requiring large displacement such as seismically isolated structues.
Small Damper Test Machine
The small damper test machine is designed for the testing of small to mid size dampers, friction devices and other structural components. The test machine consists of two, dynamic servo-hydraulic actuators installed in a self equilibrating system that consists of two, dynamic servo-hydraulic actuators and a reaction frame. The actuators generate vertical displacement that develops a compression or tension load in the damper or friction device attached between the top and bottom platens of the test machine.
The system capacity is 445 kN (100 kips) at 0.50 m/sec (20 in/sec) during dynamic tests. In static loading, the actuators have a peak-to-peak stroke limit of 500 mm
Large Damper Test Machine
The Large Damper, uniaxial test machine, is designed for the testing of full-size dampers. The test machine is a self-reacting system comprised of a dynamic, servo-hydraulic actuator and a reaction frame. The actuator generates a displacement that develops a compression or tension load in the damper which is attached between the actuator and the reaction frame.
The actuator can deliver 900 kN (200 kips) at 0.38 m/sec (15 in/sec) during dynamic tests. In static loading, the actuator delivers a 1560 kN (346 kips) static force with a peak-to-peak stroke limit of (600 mm) 24 in.
A Southwark-Emery, 4,000-kip Load Frame, originally built in 1932, was moved from the main campus and installed at the current PEER-UC Berkeley Lab in 1964. The uniaxial load frame can impose a 4,000 kip compression load and a 3,000 kip tension load. The maximum horizontal clearance between the vertical columns is 10'. The maximum length of a compression test element is 33.5 feet. In tension, the maximum specimen length is 22 feet. The stroke limit is 48" and the maximum rate of loading, at full capacity, is 0.071 inches per second. A dedicated hydraulic system provideshigh pressure oil to the 4,000 kip Load Frame. The load measuring emery-capsule and the associated electronic read-outs are routinely calibrated with NIST traceable equipment and procedure. A 12 ton bridge crane is accessible tothe entire Lab where the 4,000 kip Load Frame is sited. A dedicated 8 ton crane and a perimeter elevator platform, provide additional utility to the 4,000 kip Load Frame. The below the crane hook ceiling height of the Lab is 65' and the truck entry door to the Lab is 11' wide and 16' tall. The 4,000 kip Load Frame is routinely utilized for research projects and is also available to commercial clients who require large loads to complete their required testing. An inventory of test machine specific hardware is maintained by PEER, as well as transducers, controllers and data systems.
Reaction Wall and Floor
he structural tie-down floor is located on the east end of the main bay of the laboratory. The overall plan dimensions of the tie-down slab are 20 x 60 ft. The slab has 2-1/2 inch holes located in an array of 36 inch on center over the 20 x 60 ft area. The test floor provides a completely versatile facility for testing large structural assemblies. Static or dynamic loads may be applied to specimens using tie rods, hydraulic actuators and steel loading frames. The test floor was designed to act as a hollow box girder in the longitudinal direction and as a vierendeel girder in the transverse.
Fleet of Actuators
|Manufacturer||Model||Load Capacity kN (kip)||Stroke mm (in)||Quantity|
|MTS||243.70T||1460 (328)||1829 (72)||3|
|Sheffer||20HHC12||4180/3110 (940/700)||300 (12)||2|
|Sheffer||14HHC20||2000/1500 (460/340)2000/1500 (460/340)||500 (20)||2|
|Sheffer||14HHC10||2000/1500 (460/340)||250 (10)||2|
|Parker||CBB 2HL 40C||1070 (240)||600 (24)||1|
|Parker||CD 2H 14C||530 (120)||900 (36)||2|
|Parker||BB 2H LT18A||270 (60)||900 (36)||1|
|Manufacturer||Model||Load Capacity kN (kip)||Stroke mm (in)||Quantity||Velocity, mm/sec (in/sec)|
|MTS||244.51S||1000 (220)||508 (20)||2||508 (20)|
|MTS||244.50||667 (150)||1016 (40)||2||508 (20)|
|Parker||14.0.TM3Sh 24.000||1560/1560 (350/350)||600 (24)||1||375 (15)|
|Parker||CD 2H 14C||530 (120)||900 (36)||2||175 (7)|
|Sheffer||N/A||530 (120)||500 (20)||1||500 (20)|
|Sheffer||6HHTF/RHF20||380/270 (85/60)||500 (20)||2||> 500 (20)|
|MOOG||85 446||330 (75)||300 (12)||1||750 (30)|
|MTS||N/A||310 (70)||300 (12)||1||750 (30)|
|RexRoth||MT4-HH||170 (38)||2500 (100)||2||1125 (45)|
|Cunningham||Nitrogen jack, AP||90/60 (20/13)||250 (10)||2||> 1250 (50)|
|Sheffer||2.5HHTF15||50/50 (12/12)||375 (15)||2||625 (25)|