A Methodology for Preliminary Seismic Design of Structures With Or Without Energy Dissipation Devices


Abstract eng:
It is generally accepted that structural design under seismic excitations must be displacement- rather than force-based with the guiding design variables being ductility limits, damage indices and inter-story drift. Further, more than one level of seismic demand must be considered, establishing performance requirements for each one, in what is known as “performance-based design”. Also, there are current techniques being developed for the application of passive control of structural responses, controls provided by energy dissipation devices. These act in response to relative displacements between structural elements. The objective of these replaceable devices is to concentrate the damage in the devices, avoiding or diminishing its occurrence in the rest of the structure (beams, columns, shear walls, etc.). It is important to have a preliminary design methodology for the structure, with or without energy dissipation devices, a design that can later be improved by more detailed methods. The preliminary design should be clear in concept, and rely in as few simple calculation steps as possible. It must be displacement-based and be applicable to cases with or without devices. This work presents such a method for preliminary design. It uses inelastic design spectra in the form of capacity diagrams or Yield Point Spectra (YPS). The method can be applied to structures for which the global response, in terms of the relationship between top displacement and base shear, can be represented by an equivalent system with a single degree of freedom. For such structures, the response is dominated by the first vibration mode. The method is based on the calculation of the available ductility, starting from the limit displacement which is consistent with the required performance level and the yield displacement of either the structure or the energy dissipation devices (in case that controls are implemented). With the ductility and the yield displacements, the design spectra allow the determination of the required resistance. The proposed method represents an advance with respect to previous work, adding more clarity of concept and generalization of application to systems with or without devices. Several numerical examples are presented corresponding to a building with different number of stories and different lay-out with and without vibration control. It is shown that the methodology is simple and consistent, and that is a useful tool for the preliminary design of seismic resistant structures.

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 352.:
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