Experimental Behavior of Welded Connections Between Square Steel Tubes Conformed by G Profiles of 60x30x10x2 and 80x40x15x3 mm Subjected to Monotonic Load

Experimental Behavior of Welded Connections Between Square Steel Tubes Conformed by G Profiles of 60x30x10x2 and 80x40x15x3 mm Subjected to Monotonic Load

• Carlos Alberto Romero Romero Universidad Politécnica Salesiana https://orcid.org/0000-0002-0974-8408
• Franklin Paul Verdugo Astudillo Universidad Politécnica Salesiana https://orcid.org/0000-0002-0299-6230
• Julio Sebastián Bejarano Saritama Universidad Politécnica Salesiana https://orcid.org/0000-0002-1412-355X
• José Domingo Alviar Malabet https://orcid.org/0000-0001-9613-0675
• Nelson Andrés López Machado https://orcid.org/0000-0002-3111-7952 https://orcid.org/0000-0002-3111-7952

DOI: https://doi.org/10.22209/rt.v44n2a04

Keywords: monotonic load, welded connection, G profiles, plastic hinge joint

Abstract

In Ecuador, the use of square tubular steel connections has been increased in houses and shopping centers. However, there is no regulation that explains the connection's behavior. In this research, the experimental behavior of this connection was evaluated. Because of this, tests were carried out where the elastoplastic behavior of welded joints with square steel tubes conformed by G profiles of 60x30x2 and 80x40x3 mm, subjected to monotonic load, were analyzed. Each test consisted of imposing progressive load on the upper connection of the frame, in order to measure the displacements and distortion of the geometry of the beam-column connection elements of the lower connection. The results show that the experimental collapse load in frames 1, 2 and 3 (connection without reinforcement) decreased 12.82 % in comparison to the theoretical value, meanwhile, the collapse for frames 4, 5 and 6 (reinforced connection) increased by 14.96 %. The reinforcement was made up of plates installed in the column of the lower connection. With this, the failure due to local buckling has been avoided and the formation of plastic hinges in the beam of the welded joint has been guaranteed, thus fulfilling the criterion of weak beam-strong column.

 

https://doi.org/10.22209/rt.v44n2a04

References

AISI. (1996). Cold formed steel design manual. Washington: American Iron and Steel Institute (AISI).
ASTM A-36. (2014). Standard specification for carbon structural steel. West Conshohocken:
American Society for Testing and Materials (ASTM).
Carapaz, D. (2015). Estudio experimental de columnas tubulares de acero rellenas de hormigón sometidas a carga axial. Tesis de grado. Quito: Universidad Politécnica Nacional.
Cervera, M. R., Blanco, E. D. (2015). Resistencia de materiales 6ta ed. Barcelona: Ediciones UPC.
ANSI/AISC. (2010). Construcciones de acero, especificación 360-10. Chicago: American National Standards Institute (ANSI) American Institute of Steel Construction (AISC).
Freddy, D. (2016). Comportamiento de conexión a momento empernada (viga-columna) entre perfiles tubulares de acero conformados en frio (HSS). Tesis de grado. Caracas: Universidad Católica Andrés Bello.
Hibbeler, C. (2017). Mecánica de materiales. 9na ed. Ciudad de México: Pearson.
Kassimali, A. (2015). Análisis estructural. 5ta ed. Ciudad de México: Cengage Learning.
Matthew, F. (2013). Cyclic bending behavior of hollow structural sections and their application in seismic moment frame systems. Tesis doctoral. Michigan: University of Michigan.
McCormac, J. (2012). Diseño de estructuras de acero. 5ta ed. Ciudad de México: Alfaomega.
NEC-SE-CG. (2014). Carga no sísmica. Quito: Norma Ecuatoriana de la Construcción (NEC).
NEC-SE-AC. (2014). Estructuras de acero. Quito: Norma Ecuatoriana de la Construcción (NEC).
NEC-SE-DS. (2014). Peligro sísmico diseño sismo resistente. Quito: Norma Ecuatoriana de la Construcción (NEC).
Catálogo. (2017). El acero del futuro. Quito: Novacero.
Pellicer, D. (2014). Principio de construcción de estructuras metálicas 2da ed. Madrid: Bellisco.
Romero, C. (2010). Comportamiento de conexiones soldadas de tubos estructurales de acero de sección cuadrada sometidos a flexión monotónica. Tesis de maestría. Maracaibo: Universidad del Zulia.
Romero, C. (2019). Comportamiento elastoplástico de conexiones soldadas en tubos de acero de sección cuadrada sometidos a carga monotónica. Gaceta Técnica DIC, 20-(1), 23-29.
Rezaifar, O., Younesi, A. (2017). Analytical study of beam-to-HSS/CFT column connections by trapezoidal external stiffener. International Journal of Steel Structures, 17-(2), 1-14.
SAP 2000. (2017). Structural software for analysis and design. Walnut Creek: Computers and Structures, Inc. (CSI).
Seguí, W. (2013). Steel design 5tn ed. Stanford: Cengage Learning.
Ugarte, A., Sarcos, A., Flores, J. (2006). Comportamiento de tubos cuadrados a flexión monotónica. Boletín Técnico IMME, 44-(2), 1-20.