Las metodologías convencionales de diseño de estructuras sismo-resistentes se basan en el diseño de resistencia, rigidez y ductilidad de la estructura en el rango inelástico. Recientes avances en el área, buscan generar nuevas metodologías basadas en la disipación de energía del sismo mediante dispositivos externos. Lo anterior con el fin de disminuir los daños que se puedan presentar en los elementos estructurales después de la ocurrencia de un sismo. En este artículo, se propone una metodología para la optimización del diseño de pórticos de acero resistentes a momentos, equipados con amortiguadores de masa sintonizada. El objetivo es disminuir las deformaciones, los daños estructurales, los no estructurales y el costo de la estructura. En el proceso de optimización se utilizó una heurística basada en la teoría de la evolución de una población y denominada algoritmo de evolución diferencial. Se modificó adicionando dos características para mejorar su funcionamiento. En primera instancia, se le generó una autoadaptación de los parámetros de mutación y cruzamiento. Por otra parte, se le dio características multimodales para ayudar al algoritmo a encontrar el óptimo global. Finalmente, utilizando la metodología de optimización en los diversos casos de estudio, se pudo observar que la calidad de la solución y la convergencia del algoritmo eran buenas. Además, se vio una mejoría en la calidad de optimización debido a las características adicionadas de funciones multimodales y parámetros autoadaptativos. Haciendo que el algoritmo tuviera mayor espacio de exploración y explotación.

Essential facilities, such as hospitals, communication systems, highways, bridges, among others, play a significant role in a community. These facilities are vital, especially after being hit by a natural hazard. They must remain functional after a significant event to provide essential services to the community. The implementation of control systems during the structural design and rehabilitation stages enables an attractive manner for this type of structure to dissipate the dynamic response under major disturbance events. Typically, the design stage of structural control systems focuses its attention on the asset's structural configuration. Under seismic events, the structure's response can be altered by the interaction between the structure and the soil underneath. In this paper, the dynamic response's influence is evaluated through numerical simulation by including the effects of soil-structure interaction in a concrete moment resistant frame with viscous fluid-type energy dissipation systems. For this analysis, seven ground motion records were selected for the analysis, considering their frequency and source of content. These records are matched to the corresponding building code design response spectrum for areas prone to high seismicity. Similarly, the soil profiles used for the analysis correlates with the same seismic hazard zone. The analyzed structure corresponds to an essential facility of high importance modeled as a two-dimensional concrete moment resistant frame. The analysis is performed on a seven-story building implementing viscous dampers. Two cases are studied: implementing and neglecting the effects of the soil-structure interaction. The results for the case-study show a significant increase in the dynamic response in terms of displacement, interstory drift, and base shear when considering soil-structure interaction.

During the last few years, different methodologies have been developed for the analysis of the structural seismic response, such as the performance-based design, the systems of energy dissipation, seismic isolation. Based on these efforts, a number of devices, known collectively as protection systems have emerged. They are divided into three types of systems: passive, active, and semi-active. Passive systems dissipate energy through friction, viscous fluid dampers, and inelastic behavior of the material, among others. On the other hand, active control systems can be implemented by applying time varying forces to counteract those imposed by the excitation. which can be active, passive, semi-active, active, etc. This paper presents the response of the structure when it enters the nonlinear range and is being controlled by the Viscous Damper. To obtain the nonlinear response of the structure system through numerical simulation are used the Methodologies of ASCE 7-10 and ASCE 7-16. To examine the behavior of the structures and the application of each methodology, simulations using concrete frames of 5, 7 and 11-story buildings were performed. The models were subjected to the horizontal components of different earthquakes, for the ASCE 7-10 were used three earthquakes, for the ASCE 7-16 were used seven earthquakes. These seismic records are subjected to a matching process to obtain records that match the corresponding building code design spectrum for a high seismic risk zone. The history displacement and acceleration results were compared with those obtained with the uncontrolled structure with nonlinear behavior.