Propuesta de drift límite y factor de modificación de la respuesta estructural “R” para edificios de mediana altura estructurados con muros y losas de CLT
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Fecha
2019
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Idioma
es
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Universidad Andrés Bello
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Licencia CC
Licencia CC
Resumen
La tesis estudia una propuesta de desplazamiento límite de entrepisos (Drift) de un edificio compuesto de muros estructurales de madera contralaminada (CLT), mediante la variación del factor de modificación de la respuesta estructural “R”. Para evaluar el comportamiento de la estructura y obtener registro de los desplazamientos máximos de entrepisos, se elaboró la modelación de un edificio de cuatro pisos variable en su cantidad de muros, sometido a la acción de 18 registros de aceleraciones correspondientes al terremoto Mw 8,8 ocurrido en Chile el 27 de febrero de 2010. Para la modelación se utilizó el programa SAPwood v2.0, el cual permite tener registro de las respuestas máximas de una estructura frente a un determinado registro sísmico. Esta herramienta permite introducir el comportamiento histeréticos de muros ensayados ante carga lateral, de modo que la estructura rige su comportamiento global de acuerdo al comportamiento mostrado por los muros a nivel de componente. Basado en los resultados obtenidos de la simulación, los desplazamientos máximos de entrepisos fueron representados en una función de distribución acumulada, la cual relaciona el desplazamiento con la probabilidad de no excedencia de este. Posteriormente, se mide la sensibilidad del factor de modificación de la respuesta estructural, realizando simulaciones a los modelos frente al registro de Constitución CH3 para escalas de terremoto de 0.8 g, 1.0 g y 1.2 g.Finalmente, a partir de los resultados mostrados en el análisis de sensibilidad de los modelos, un valor de R=2 puede ser asignado para el diseño sísmico de edificios que empleen el uso de muros de CLT en Chile.
The thesis studies a proposal of limited displacement of mezzanines (Drift) of a building composed of structural walls of cross laminated timber (CLT), by varying the response modification factor “R”. In order to evaluate the structure's behavior and obtain a record of the maximum displacement of mezzanines, the modeling of a four-floor building was prepared, which is variable in its amount of walls. It was also submitted to the action of 18 acceleration records corresponding to the 8.8 Mw earthquake occurred in Chile on February 27, 2010. For modeling, the SAPwood v2.0 program was used, which allows to have a record of the maximum responses of a structure against a particular seismic record. This tool allows to introduce the hysteretic behavior of walls tested against lateral load so that the structure governs its overall behavior according to the behavior shown by the walls at component level. Based on the results obtained from the simulation, the maximum displacement of mezzanines were represented in a cumulative distribution function, which relates the displacement with the probability of not exceeding this. Subsequently, the sensitivity of the structural response modification factor is measured, performing simulations to the models against the CH3 constitution record for earthquake scales of 0.8g, 1.0g and 1.2g. Finally, based on the results shown in the sensitivity analysis of the models, a value of R = 2 can be assigned for the seismic design of buildings that employ the use of CLT walls in Chile.
The thesis studies a proposal of limited displacement of mezzanines (Drift) of a building composed of structural walls of cross laminated timber (CLT), by varying the response modification factor “R”. In order to evaluate the structure's behavior and obtain a record of the maximum displacement of mezzanines, the modeling of a four-floor building was prepared, which is variable in its amount of walls. It was also submitted to the action of 18 acceleration records corresponding to the 8.8 Mw earthquake occurred in Chile on February 27, 2010. For modeling, the SAPwood v2.0 program was used, which allows to have a record of the maximum responses of a structure against a particular seismic record. This tool allows to introduce the hysteretic behavior of walls tested against lateral load so that the structure governs its overall behavior according to the behavior shown by the walls at component level. Based on the results obtained from the simulation, the maximum displacement of mezzanines were represented in a cumulative distribution function, which relates the displacement with the probability of not exceeding this. Subsequently, the sensitivity of the structural response modification factor is measured, performing simulations to the models against the CH3 constitution record for earthquake scales of 0.8g, 1.0g and 1.2g. Finally, based on the results shown in the sensitivity analysis of the models, a value of R = 2 can be assigned for the seismic design of buildings that employ the use of CLT walls in Chile.
Notas
Tesis (Ingeniero Civil)
Palabras clave
Edificios, Efectos Sísmicos, Estructuras de Madera, Diseño y Construcción, Madera Aserrada, Modelos Matemáticos