Comparison of the Inelastic Seismic Behavior in a Nine Level Building Structured Without and with Energy Dissipation

Abstract eng:
The inelastic seismic behavior of a new nine level building structured by the following ways is compared: a) only frames (monolithic beams and slabs with columns); b) frames with the help of steel braces and energy dissipaters ADAS type. It is intended to observe how the seismic effects are distributed in the different existent structural elements in order to decide what the most convenient is to reduce damages according to the design point of view. The building of both cases, reinforced concrete, was dimensioned under the requirements of Mexico City Code, making practical considerations: B group (offices), zone IIIb (soft soil), permissible interstory lateral deformation of 0.012, seismic behavior factor Q= 3. The second order and gravitational loads effects were included. The energy dissipaters distribution as well as the diagonals was made based on the idea of accomplish with architectural aspects and also to look which position and plate numbers of such dissipaters was convenient to achieve a more uniform seismic behavior in all the structure. The calculation of the inelastic responses is done with step-by-step dynamic analysis with the SCT-EW-1985 record, earthquake representative of the soft zone in Mexico City. Inelastic seismic behavior comparison is made based on the local and global ductility maximum demands. With the help of ADAS, the reinforced concrete elements are checked to verify and prove than in these members a different and favorable behavior was obtained. Some conclusions are obtained to new and to retrofit structures with this kind of energy dissipation.

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