Browsing by Autor "Juan F. Correal"

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Digitally Augmented Database of Fracture-Critical Steel Beam-to-Column Connection Tests
(American Society of Civil Engineers, 2025) Francisco A. Galvis; Gregory G. Deierlein; Wen-Yi Yen; Carlos Molina Hutt; Juan F. Correal
This paper describes a recently compiled database of 100 full-scale steel beam-to-column connections that failed due to flange fractures. This database focuses on welded flange connections tested in the past 50 years, including tests with strong panel zones and box columns that have been excluded from previous collections. This database is augmented with high-fidelity structural models carefully calibrated to the test data using a semiautomatic algorithm to extend the information from each experiment beyond the recorded response. Once calibrated, these models offer a versatile method to decompose the total displacement response of the connections in beam, panel zone, and column deformations and extract more detailed response quantities, such as the stress history of the flange. This augmented database enables a deeper understanding of the causes of flange fractures and an assessment of the common rotation limits in ASCE/SEI 41 employed for simulating fracture. The results show that these rotation limits have a considerably large error. Furthermore, these rotation limits are incapable of either identifying the flange that would fracture first or simulating the opening and closing behavior of a fractured flange. The stress histories of the flange extracted using the models is a more efficient demand parameter for characterizing fracture behavior. This database is openly available in the DesignSafe DataDepot and is immediately useful for researchers developing new models for beam-to-column connections susceptible to fracture and to practicing engineers interested in calibrating structural models for nonlinear dynamic analysis.
Experimental Study of Glued Laminated Guadua Bamboo Panel as an Alternative Shear Wall Sheathing Material
(Trans Tech Publications, 2012) Juan F. Correal; Sebastian Varela
Wood frame buildings have shown good performance on past earthquakes mainly because the lateral system of those buildings was able to dissipate energy without significant loss of lateral capacity. Typically, the lateral load resisting system is provided by wood shear walls, which consist of a wood frame sheathed with wood or wood-based composites, such as Plywood or OSB panels. Taking into account the increasing forest demand for wood, there is a global need to find alternative energy-efficient, renewable and eco-friendly construction materials. Giant bamboo like Guadua Angustifolia kunt emerges as an interesting construction material, since it has a fast growing rate (3 to 4 years), high strength to weight ratio and high carbon (CO2) capture capabilities. Results of a past study conducted at the Universidad de los Andes in Bogotá-Colombia reported that Glued Laminated Guadua Bamboo (GLG) has mechanical properties comparable to those of the best structural timbers in Colombia. Potential applications of GLG include not only laminated beams and columns, but also structural panels to be used as a sheathing material for wood frame shear walls. A comprehensive experimental study has been performed on GLG sheathed shear walls in order to find an alternative sheathing material for wood frame buildings as well as to explore their possible application for residential and/or commercial construction in Colombia. A series of tests were conducted on full-size shear wall specimens in order to study the influence of the wall aspect ratio and the edge nail spacing on the shear wall performance. Based on cyclic tests on shear walls, it was found that the stiffness and maximum load carrying capacity of the wall increases as edge nail spacing decreases. In contrast, the displacement ductility capacity decreases, since the rotation of the panels is restricted when the edge nail spacing is reduced. Experimental results also revealed that stiffness, maximum load capacity, and ductility of the GLG sheathed shear walls are not affected by the aspect ratio of the wall. The final stage of the present study included dynamic shake-table tests on full-size one and two-story housing units using GLG sheathed shear walls. Results showed that the units had similar performance characteristics to those of OSB and Plywood sheathed shear walls, and it was concluded that wood-GLG combination could be a viable construction alternative from a structural point of view.
Racking Performance of Traditional and Non-Traditional Engineered Bamboo Shear Walls
(Trans Tech Publications, 2012) Juliana Arbeláez Gaviria; Juan F. Correal
Guadua Angustifolia Kunt (G.A.K.) is a bamboo specie that has been considered an alternative material for construction in some of the Latin-American countries. In Colombia, specifically in coffee region, G.A.K. has been used mainly for residential buildings, having bahareque (Split bamboo and mortar connected to a guadua frame) as the preferred structural system for this type of structures. This system has shown an adequate seismic behavior during earthquakes like the one in Armenia (1999), [. Nowadays, there is not a real understanding of the structural behavior of this kind of bamboo shear walls. For that reason, a study on the seismic performance of engineering bahareque shear walls and two kinds of non-conventional G.A.K. shear walls is done. Throughout this article, the preliminary results of this study are presented, based on monotonic tests only. So far, 13 tests have been run on the different types of shear walls. In addition, 6 static tests were performed on the connection of the shear walls to the foundation, to understand the capacity and the behavior of this type of joint. The results show that the structural behavior of engineering bahareque shear walls is both adequate and better than the one observed on the two kinds of non-conventional shear walls. In spite of that, some changes on the constructive details could improve the structural behavior of these two kinds of shear walls. As for the connection of the shear walls to the foundation, it is observable that the capacity of the joint is related to the resistance of cement mortar. Also two types of failure, identified on the study, affect directly the connection behavior.
Riesgo sísmico, geotécnico y estructural. El caso de estudio de los edificios San Jerónimo de Yuste en Bogotá
(Spanish National Research Council, 2018) Juan Manuel Medina; Camilo Villate; Bernardo Caicedo; Luis E. Yamín; Juan F. Correal; Nicolás Estrada; Raul Rincón
El conjunto residencial San Jerónimo de Yuste se encuentra ubicado en Bogotá, en un terreno inclinado en el pie de monte de los cerros orientales de la ciudad. Fue construido entre 2008 y 2011, como parte de un proyecto de urbanización promovido por la caja de compensación familiar Compensar. Durante mayo y junio de 2013 el terreno presentó desplazamientos tanto verticales como horizontales que generaron daños visibles en las estructuras y motivaron la evacuación de dos de las seis torres que conforman el conjunto. El presente trabajo presenta los resultados de la investigación que llevaron a cabo los grupos de investigación de las facultades de Arquitectura e Ingeniería de la Universidad de los Andes para determinar las causas que condujeron al evento de desplazamiento de la estructura debidas al movimiento del terreno, estimar el coeficiente de seguridad actual y proponer intervenciones geotécnicas y estructurales que permitan recuperar la edificación.