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The Complementary Technical Requirements for Seismic Design of the Mexican Building Code do not contemplate explicitly several variables that are relevant for the design of the lateral strength of structures located in the Lake Zone of Mexico City. Firstly, the lack of explicit consideration of the cumulative plastic demands results in an underestimation of the lateral strength of structures having a period of vibration close to the ground period at the site. Secondly, the particularities of the hysteretic cycle affect the strength demands of earthquake-resistant structures, in such way that not considering it explicitly may result in an underestimation of the lateral strength of structures exhibiting degrading behavior and a period less than the ground period at the site. Thirdly, the concept of lateral overstrength is discussed, and the need to carefuly calibrate the expressions offered by the technical requirements to estimate it is emphasized. This paper introduces the concept of constant cumulative ductility spectra as a tool to correct the underdesign of lateral strength of some reinforced concrete ductile structures located in the Lake Zone of Mexico City.

DISEÑO POR DESEMPEÑO DE ESTRUCTURAS DÚCTILES DE CONCRETO REFORZADO UBICADAS EN LA ZONA DEL LAGO DEL DISTRITO FEDERAL: LA RESISTENCIA LATERAL DE DISEÑO