INELASTIC SEISMIC BEHAVIOR COMPARATION OF A TYPICAL REINFORCED CONCRETE 10 LEVEL BUILDING WITH FRAMES AND SHEAR WALLS DESIGNED WITH TWO CODES

摘要

The seismic elastic and inelastic behavior of a typical reinforced concrete 10 levels building in Mexico city designed according to the RDF-1993 and RDF-2003 (to be approved) Codes is compared. It is intended to corroborate that the modifications made to the RDF-1993 Code provide safe structures with suitable behavior facing severe earthquakes, according to the type and importance of the structure and kind of soil where will be build, based on the new seismic zone of the Valley of Mexico; the previous analysis is made based on the RDF-1993, current nowadays. The building is structured with longitudinal direction frames and with shear wall frames in the transversal direction. The design is made with the modal dynamics seismic analysis and the seismic spectra corresponding to zone III (soft) of the RDF-1993 Code and zone IIIb (soft) of the RDF-2003 Code; the dimensions of the structural elements are determined satisfying the permissible relations of the relative lateral displacements between the story height (0.012 in longitudinal direction and 0.006 in transversal direction); to satisfy the limit state of failure, a seismic behavior factor Q= 3 is used, designing with the general requirements and with the special requirements needed for ductility. The use is for offices (B group); the designs are made considering the gravitational loads and the second order effects. The calculation of the inelastic responses is done with dynamic step by step analysis with the SCT-EW-1985 register, earthquake representative of the structural damages on the soft zone in Mexico city; the local and global ductility demands are determined, the possible tendencies of failure mechanisms and no-lineal deformations in the structural elements. The inelastic responses, after being satisfied the RDF-2003 design conditions, show satisfactory structural behavior; the majority of the beams have less plastic hinges.