Design Criteria for Seismic Retrofit of Vulnerable Concrete Frames Using Energy Dissipators

Abstract eng:
Many buildings in Spain are vulnerable to the design earthquakes mainly because the former Spanish code required only low lateral strength and did not contain any ductility demand. Further, a large number of these structures are reinforced concrete moment resisting frames with wide beams and one-way joist slabs. Such frames are highly vulnerable due to low lateral stiffness and strength, low ductility and deficient beam-to-column moment transmission. This study is concerned with the seismic upgrading of reinforced concrete moment resisting frames with wide beams designed only for gravity loads and located in low seismicity regions, by using hysteretic energy dissipators. The objective of this study is to clarify the influence of the spatial, strength and stiffness distributions of the dissipators in the seismic response of the frame. To this end, a numerical parametric assessment is carried out. The main issues and parameters are: (1) number of floors (1 to 6), (2) plan symmetry, (3) distribution of stiffness and yielding force of the dissipators along the height of the building, (4) plan and vertical layout of the devices in the frame and (5) seismic input. The seismic performance of the frames is assessed by nonlinear static and time history analyses. The nonlinear behavior of both the main frame and the dissipators is accounted for. Performance indices are: base shear coefficient, overturning moment, interstory drifts, damage index and plastic deformation energy per floor.

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