Examinando por Autor "Guerrero, Néstor"
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- PublicaciónSólo datosCyclic Behavior of Hollow Section Beam–Column Moment Connection: Experimental and Numerical Study(Metals, 2020-12-01) Nuñez, Eduardo; Boainy, Nwar; González, Freddy; Torres, Ronald; Picón, Ricardo; Guerrero, NéstorSteel buildings with tubular columns showed a satisfactory performance during the Honshu (2011) earthquake, unlike steel buildings in the 1994 Northridge and 1995 Kobe earthquakes, where welded moment connections showed damage in their joints. In this research, a lateral joint using a hollow structural section (HSS)-beam and HSS-column subjected to cyclic displacement was performed. Three large-scale specimens were tested and a numerical model was calibrated, reaching a good adjustment. Later, several configurations of beams and columns were evaluated using finite element (FE) models from the numerical model previously calibrated. A flexural resistance higher 0.80 Mp at 0.04 [rad] was obtained for all cases studied. The ductility factor in the 3 specimens was lower than 2.5, therefore a non-ductile behavior was controlled in the connection. This aspect is very important although a 0.8 Mp at 0.04 [rad] was achieved. Finally, the typical welded moment connection can be improved using the bolted moment connection, which allows the concentration of inelastic incursion in the beam compared with the welded solution. However, a non-ductile behavior derived from local buckling in flanges of a tubular beam can affect the seismic performance.
- PublicaciónAcceso abiertoEvaluación de vulnerabilidad sismo resistente del edificio de humanidades II de la Universidad de Ibagué(Universidad de Ibagué, 2019) Solano Patiño, Diana Paola; Reinozo Conde, Anguie Fernanda; Guerrero, Néstor; Del Rio, Juan DavidTo understand how a structure will interact and respond to different events during its useful life, it is necessary to study especially the geological or natural aspects that may affect it, such as: close or distant location of geological faults and the depth at which are located, the location of the land with respect to water sources that can produce floods or high water tables, and the amplification of the accelerations of the land with respect to acceleration in rock. The building that will be studied is located at the University of Ibagué. This city is located in an area of intermediate seismic threat. A clear expression of what these threats constitute is reflected in the landscape of the so-called Ibagué fan in which the glacial and volcanic activity of the Central Cordillera is evidente. The objective of this work is to offer the widest possible panorama in relation to the conception, design, construction and fundamental analysis problems in reinforcement actions on this structure. To do this, as a preliminary matter, some basic definitions and concepts of the problem are established, and the current state of the building is analyzed in general terms. Although the nature of the work does not allow for an in-depth study of some of the issues addressed, an approximation is always made to them, while basic bibliographic references are offered for a more detailed study of the subject.
- PublicaciónAcceso abiertoInfluence of global slenderness and sliding pallets on seismic design of steel storage racks: a sensitivity analysis(2022-10-31) Nuñez, Eduardo; Mata, Ramón; Castro, Jorge; Maureira, Nelson; Guerrero, Néstor; Roco, ÁngelIn this research, the influence of global slenderness and sliding pallets factor on the seismic design of steel storage racks are assessed. Variations in span length, the height of storage levels, live load, and percentage of live load considered in the seismic mass are studied for different levels of seismic zone and soil type. The models were designed according to the Chilean Code NCh2369. Subsequently, a global sensitivity analysis was developed to analyze the influence of each studied parameter in the seismic design response in terms of fundamental period, drift, and base shear from a response spectral analysis approach. A total of 12000 simulations were performed. Two-hundred additional models were performed to evaluate the variation of seismic mass in the structural response. Results indicate a significant influence of live loads and seismic mass on steel racks designed for soft soils and unbrace conditions. The stiffness also modifies the performance of the racks, mainly in models using braces in the down-aisle direction and cross-aisle direction. In these cases, the seismic mass factor does not have a strong influence on structural response in comparison to the global slenderness
- PublicaciónAcceso abiertoVideo Diplomado en competencias básicas en TIC 2018B(Universidad de Ibagué, 2018-12-10) Rojas, Gina; Del Río, Juan David; Morales, Edwin Giovanni; Moreno, Miguel César; Molina, Yair Guillermo; Garzón, Claudia Catalina; Ramírez, Juan Pablo; Balaguera, Sergio Alejandro; Ramírez, Angie; Guerrero, Néstor; Ávila, Tatiana; Zuluaga, Juan Guillermo; Vejarano, Natalia