Cálculo del coeficiente de capacidad de disipación de energía en pórticos regulares de concreto reforzado con diferente altura, para una zona de amenaza sísmica alta.

Abstract

Introduction: The energy dissipation capacity coefficient (R) is a determining parameter in the earthquake-resistant design. This parameter represents the amount of energy that can dissipate a structure through its inelastic deformations, that allows to reduce the seismic forces for the design of a structure. In the design codes, values ​​for said R coefficient are presented according to the structural system and the structural elements material, but in none of the cases is the dynamic behavior of a structure considered to select its value.

Objective: Calculate and verify the value of the R coefficient for reinforced concrete porticos systems of low, medium and high height.

Method: a quantitative method was used to obtain the results of this investigation. Systems contributed in the non-linear and inelastic field were analyzed, knowing the plastic properties of the sections through the moment vs. diagrams. curvature. These diagrams were obtained by analytical methods and using the XTRAC program. Then, with a non-linear static analysis the capacity curve was obtained, and using the capacity spectrum method, the NEHRP method and the Newmark and Veletsos method, the R coefficient was calculated.

Results:  The coefficient R was obtained for frames with different dynamic characteristics, finding dependence between the value of R and the period of vibration of each modeled portal.

Conclusions: The results obtained allow questioning the selection of the value of the R coefficient with the values ​​suggested in the design codes. It is concluded that for systems provided in reinforced concrete of low height (low vibration periods) the value of R may be less than that suggested for this type of structures. And in the structures with high vibration periods, higher R coefficients can be obtained.