Browsing by Autor "Natalia Barrera"

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    Reforzamiento estructural de edificaciones patrimoniales en tierra de 1 y 2 pisos: aplicación de la normativa AIS-610-EP-2017
    (Spanish National Research Council, 2023) Daniel Ruíz; Paula Rossana Galindo Jaramillo; Anyi Lizeth Hernández Niño; Juan Carlos Reyez Ortiz; Manuela Restrepo; Natalia Barrera; José Gustavo Martínez Murcia; Cecilia Teresa López Pérez
    Los españoles que conquistaron la zona andina latinoamericana construyeron edificios en adobe y tapia apisonada. Por esta razón, el 90% de los edificios patrimoniales en Colombia están construidos en tierra; la mayoría ubicados en zonas de amenaza sísmica intermedia y alta. Considerando que estas edificaciones son sísmicamente vulnerables, en 2019 se incluyó la norma AIS-610-EP-2017 en la reglamentación sismo-resistente del país (norma para reforzamiento sísmico de edificios patrimoniales en tierra). Utilizando esta norma, se analizaron dos edificios construidos en el siglo XVI. Los muros fueron reforzados con placas de acero (o de madera). Los resultados indican que para cargas sísmicas solo el 24% de los muros sin refuerzo tendrían tensiones menores que la resistencia a la tracción de la tierra, mientras que en los muros reforzados este porcentaje es del 98%. Asimismo, las tensiones en los elementos de refuerzo (acero y madera) se mantienen por debajo de los límites permisibles.
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    Seismic Performance of a 1:4 Scale Two-Story Rammed-Earth Model Reinforced with Steel Strips Tested on a Bi-Axial Shaking Table
    (2023) Natalia Barrera; Daniel Ruíz; Juan C. Reyes; Yezid A. Alvarado; Daniela Carrasco-Beltrán
    During the 16th and 17th centuries, Latin American cities adopted earthen construction techniques from European colonizers. As a result, rammed earth (RE) buildings now occupy an important place in Latin America's cultural heritage. However, earthquakes around the world have shown that unreinforced earthen constructions are highly vulnerable. For several years, researchers in northern South America have been proposing a technique that consists of installing confining steel plates (or wooden elements) on both sides of the RE walls forming a grid. This system has shown excellent performance in controlling seismic damage and increasing strength and ductility capacity. Although researchers have tested full-scale one- and two-story earthen walls under pseudo-static loading in the laboratory, and one- and two-story earthen walls at 1:1 and 1:2 scale on uniaxial and biaxial shaking tables, the behavior of a complete reinforced module (one- or two-story) on a shaking table has never been assessed. The present study presents the results of shaking table tests performed on two-story RE modules at 1:4 scale. The experimental data indicate that the retrofit system with confining steel strips was effective in reducing the seismic damage of earthen constructions. In addition, the comparison of the results of the 1:4 scale tests with the 1:2 and 1:1 scale tests previously conducted by the researchers, shows that the acceleration levels of the equivalent prototypes are in the same order of magnitude for the three scales.