Cook, Jarrod

Testing and Modelling of Prototype Tension-Only Seismic Energy Dissipation Devices

Abstract eng:
Seismic damage-resistant structures, such as jointed precast connections and rocking wall structures, usually require supplementary energy dissipation devices to limit structural and non-structural demands. A ratcheting, tension-only device has been developed to offer resistance to loading in tension, while offering negligible resistance to compression, and can be used in conjunction with a range of energy dissipation mechanisms. This lack of compressive forces allows unimpeded re-seating of a rocking connection to minimise residual structural displacements. Upon re-loading, dissipater engagement will be more rapid due to the ratcheting mechanism, as the absence of residual compressive loads reduces the amount of elastic take-up before yielding occurs on subsequent cycles. A tension-only solution also removes the requirement for buckling restraint in the dissipater design. The design of the ratcheting mechanism was refined to provide ease of manufacture, eliminating complex and expensive processes, to reduce the overall construction costs. Experimental proof-of-concept testing on 14 yielding-steel dissipaters, providing a yield force of 45kN and an ultimate tensile force of 65kN, was used to demonstrate the function of two prototype ratcheting mechanisms and assess the hysteretic behaviour of the dissipater element and the overall system. Results show rapid and reliable engagement in both prototypes. The ratcheting mechanism can potentially induce large inelastic displacement demands within the dissipater, and simplified methods are required to define this demand. A spectral analysis has been completed to assess the effects of the device on the response of a SDOF structure model to a range of ground motion recordings. A linear relationship between spectral displacement and cumulative inelastic demand on the dissipater element is revealed for lower peak displacements. The highest ratio of cumulative inelastic dissipater demand to the peak displacement was 3.3, with the majority of results having ratios of less than 2.0.

Contributors:

Rodgers, Geoff

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.