Study on Residual Displacements of Conventional and Dual Structures


Abstract eng:
Although damage to structures may be insignificant after an earthquake, the economic impact due to residual displacements (RDs) may be huge. This has recently been highlighted by many research studies. Therefore, this study focuses on the understanding of the parameters affecting RDs in conventional and dual systems (representative of structures equipped with Buckling-Restrained Braces) located in very soft soils. For that purpose, the statistics of the residual displacement demands in conventional and dual SDOF oscillators were investigated when the oscillators were subjected to 220 ground motions recorded on the lakebed zone of Mexico City. The effects of different parameters, such as post-yielding stiffness ratio, period of vibration, strength reduction factor and level of ductility on the responses were studied. It was observed that all these parameters affect the magnitude of the residual displacements. As an example, a positive post-yielding stiffness ratio (r) in conventional structures was found to be very effective in reducing the RDs, while negative values of r were highly detrimental. On the other hand, for dual systems, it was observed that RDs may be small when the primary part remains elastic. However, if the primary part exhibits inelastic deformations, the expected RDs are increased significantly. In this case, the post-yielding stiffness ratio of the secondary part plays a key role while that of the primary part becomes unimportant. Several recommendations are made to mitigate RDs in conventional and dual structures. The results of this study may be applicable to structures whose response is not significantly influenced by higher modes.

Contributors:
Conference Title:
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.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 2344.:
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