REPEAT Frame
A REconfigurable Platform for EArthquake Testing (REPEAT) is a steel frame designed to be used repeatedly in a variety of seismic tests. It comprises cruciform connection elements, a clevis-coupon reconfigurable moment connection, and a number of modular-length tubular beam and column elements. Figure below shows several example configurations (from many possible ones) and details of the frame.

The clevis-coupon connection is used at UC Berkeley to simulate the behavior of fracturing and/or ductile moment connections. The coupons in these connections are disposable and can be bolted in and out of the frame quickly, allowing for repeated use of the frame in many tests. The frame can be bolted together in several different configurations, within 6-, 9-, 12- and 15- foot modules (corresponding to the hole spacing) in both bay width and height. The stiffness of different stories can be changed by adding turn-buckle braces.
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| REPEAT frame attached to reconfigurable reaction wall | REPEAT frame assembled in nees@berkeley lab |
Possible uses of the REPEAT frame include: 1) pseudo-dynamic testing of different regular and irregular frame configurations; 2) repeated testing of brittle structural infill wall components, such as masonry or plywood walls under realistic frame boundary conditions; 3) repeated testing of many non-structural elements, such as partition walls, ceilings, light fixtures and piping, under dynamic loading; and 4) hosting a variety of wireless and innovative wired sensor payloads to conduct validation tests of such new data acquisition systems. The REPEAT frame saves money in the long run because NEES researchers will not have to repeatedly budget for building and disposal of similar single-use frames to carry structural or non-structural components that are actually tested.


