Estimación de factores de amplificación de deflexión de estructuras de 1 grado de libertad para diferentes valores del factor de reducción por ductilidad (Rµ).

Abstract

Because a properly designed structure has the ability to dissipate input energy caused by a seismic event, Modern design provisions use this criterion primarily to optimize costs, proposing that the elastic seismic forces be significantly reduced, using an R reduction factor, for this reason the structure will experience an inelastic displacement product of that force. Since algebraic methods are not sufficient for the calculation of inelastic displacement, the rules establish factors that allow a value close to the plastic behavior of the structure to be approximated. In the National Risk and Earthquake Reduction Program (NEHRP), it establishes the use of a deflection amplification factor (Cd) to calculate the maximum expected inelastic displacement from the elastic displacement. On the other hand, the Ecuadorian construction standard (NEC-15) indicates that inelastic displacements (ΔM) are calculated by multiplying the maximum elastic displacement (ΔE) by 0.75 and by the R factor. In contrast, the American Society of Civil Engineers (ASCE7-16) proposes that elastic displacements be multiplied by a deflation amplification factor (Cd) that is normally similar to the resistance reduction factor (R). Taking into account all these variations proposed by each regulations, this research is aimed at achieving these deflection amplification factors (Cd) corresponding to structures of a degree of freedom, in order to have values standard, subject to a design spectrum.