Publication:
Curvas de fragilidad para estructuras de pórticos de hormigón armado en Puerto Rico involucrando el efecto de las paredes de mampostería no estructurales
Curvas de fragilidad para estructuras de pórticos de hormigón armado en Puerto Rico involucrando el efecto de las paredes de mampostería no estructurales
Authors
Agudelo-Calvo, Jairo A.
Embargoed Until
Advisor
López-Rodríguez, Ricardo R.
College
College of Engineering
Department
Department of Civil Engineering
Degree Level
M.S.
Publisher
Date
2008
Abstract
Las estructuras de pórticos de hormigón armado con paneles de mampostería como relleno representan una porción significativa de las estructuras construidas en Puerto Rico y en muchas partes del mundo. Muchos de los ingenieros estructurales analizan este tipo de estructuras sin tener en cuenta la interacción entre los elementos estructurales y la pared de bloque. Esta interacción modifica significativamente el
comportamiento bajo cargas laterales de la estructura, en unos casos aportando rigidez y resistencia lateral y en otros haciendo la edificación más vulnerable. Por esta razón se hace necesario contar con herramientas para predecir el comportamiento y el daño probable que puedan presentar este tipo de estructuras frente a un sismo determinado, una de las herramientas mas usadas para este fin son las curvas de fragilidad. En este trabajo se construyen las curvas de fragilidad y las matrices de probabilidad del daño para diferentes tipos de estructuras de hormigón típicas en Puerto Rico, usando diferentes configuraciones en las que se pueden encontrar las paredes de bloque dentro de la estructura. Para este fin se realizaron análisis dinámicos no lineales para cada uno de los modelos usando el programa LARZ-2D e incorporando las paredes de bloque utilizando el método de la diagonal equivalente propuesto por Stafford Smith y Carter (1969) y modificado por FEMA 306 (1998). Se construyó un modelo no lineal de rigidez degradante para tener en cuenta el comportamiento no lineal de las paredes de bloque y se incorporó dentro del programa para los análisis requeridos. Cada modelo fue analizado para 5 diferentes sismos escalando las aceleraciones desde 0.1g hasta 1.5g en incrementos de 0.1g. Los resultados obtenidos mostraron que las paredes de bloque en la mayoría de los casos fueron beneficiosas para la disminución del porcentaje de daño total en la estructura, las estructuras que mas aportaron al buen desempeño de la edificación fueron las que poseían bloques de mampostería en todos los vanos mientras las que tuvieron un comportamiento negativo fueron básicamente las estructuras de 2
niveles con paredes de bloque solo en el segundo piso.
The structures of reinforced concrete frames with masonry walls represent a significant part of the structures built in Puerto Rico and many other places throughout the World. Many structural engineers analyze this type of structure without taking into consideration the interaction between the structural elements and the masonry walls. This interaction modifies significantly the behavior of the structure under lateral loads. In some cases provides stiffness and lateral resistance and in others making the building more vulnerable. For this reason it is necessary to have tools in order to predict the behavior and possible damage these structures could have during a determined earthquake. One of the most frequently tools used for this purpose are the fragility curves. In this work fragility curves and probability damage matrix are built for different types of concrete structures in Puerto Rico, using a variety of configurations in which block walls can be found inside the structure. For this reason dynamic non-linear analysis were done for each of the models using the LARZ-2D program and incorporating the block walls using the equivalent diagonal method proposed by Stafford Smith and Carter (1969) and modified by FEMA 306 (1998). A non-linear model of variable stiffness was built and incorporated in the program for the required analysis. Each model was analyzed for five different earthquakes scaling the accelerations from 0.1g to 1.5g on increasing of 0.1g. The obtained results show that in most cases walls were beneficial in decreasing the percentage of total damage. The structures that contributed to the good performance of de building were those that possessed masonry block in all spans while those that had a negative behavior were basically the two level structures with block walls on the second floor only.
The structures of reinforced concrete frames with masonry walls represent a significant part of the structures built in Puerto Rico and many other places throughout the World. Many structural engineers analyze this type of structure without taking into consideration the interaction between the structural elements and the masonry walls. This interaction modifies significantly the behavior of the structure under lateral loads. In some cases provides stiffness and lateral resistance and in others making the building more vulnerable. For this reason it is necessary to have tools in order to predict the behavior and possible damage these structures could have during a determined earthquake. One of the most frequently tools used for this purpose are the fragility curves. In this work fragility curves and probability damage matrix are built for different types of concrete structures in Puerto Rico, using a variety of configurations in which block walls can be found inside the structure. For this reason dynamic non-linear analysis were done for each of the models using the LARZ-2D program and incorporating the block walls using the equivalent diagonal method proposed by Stafford Smith and Carter (1969) and modified by FEMA 306 (1998). A non-linear model of variable stiffness was built and incorporated in the program for the required analysis. Each model was analyzed for five different earthquakes scaling the accelerations from 0.1g to 1.5g on increasing of 0.1g. The obtained results show that in most cases walls were beneficial in decreasing the percentage of total damage. The structures that contributed to the good performance of de building were those that possessed masonry block in all spans while those that had a negative behavior were basically the two level structures with block walls on the second floor only.
Keywords
Curvas de fragilidad
Usage Rights
Persistent URL
Cite
Agudelo-Calvo, J. A. (2008). Curvas de fragilidad para estructuras de pórticos de hormigón armado en Puerto Rico involucrando el efecto de las paredes de mampostería no estructurales [Thesis]. Retrieved from https://hdl.handle.net/20.500.11801/1730