Resumo

NINO-CASTANO, Jorge A.; CHALARCA, Bryan  e  BEDOYA-RUIZ, Daniel. Influence of seismic isolation on the seismic design of buildings with reinforced concrete wall structure. Ing. compet. [online]. 2024, vol.26, n.1, e-20212779.  Epub 26-Fev-2024. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v26i1.12779.

The use of reinforced concrete walls has become popular in Latin America as a structural system for the construction of residential buildings. However, this system is characterized by a low ductility capacity, compromising its seismic performance during the last strong earthquakes. To improve the seismic performance of reinforced concrete walls, building codes have increased the design requirements such as augmenting the use of boundary elements, larger cross sections and safety factors. These new requirements lead to higher building costs without assuring obtaining higher levels of seismic performance, becoming necessary the implementation of novel technologies that allow the improvement of the seismic performance of this structural system. Seismic isolation allows for reducing the seismic demand on the structure and increasing the seismic performance without incurring larger design values. This study uses three real buildings composed of reinforced concrete walls located in a high seismic region and soil type D, designed based on the Colombian building code. Nonlinear models of these three buildings were generated to evaluate the seismic response under actual ground motions. The three buildings were then redesigned using seismic isolation and the same analysis procedure was carried out to obtain the seismic response of the isolated buildings, comparing the results with those of the fixed base. The results show that the seismically isolated buildings exhibited a higher seismic performance, moving from a life safety performance level of the fixed-base buildings to an immediate occupancy performance level. In addition, the isolated buildings required up to 50% less reinforced steel and up to 100% fewer boundary elements compared to the fixed-base buildings, while keeping the architectural and building advantages of the wall structural system.

Palavras-chave : reinforced concrete walls; seismic isolation; seismic performance; boundary elements; steel reinforcement.

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