Shear Connector Design of Steel Belt Truss-to-Concrete Mega Column Connection

• Published in: ACI structural journal Vol. 114; no. 2; p. 499
• Main Authors: Park, Hong-Gun, Baek, Jang-Woon, Hwang, Hyeon-Jong, Eom, Tae-Sung
• Format: Journal Article
• Language: English
• Published: Farmington Hills American Concrete Institute 01.03.2017
• Subjects: Belts; Column connections; Columns (structural); Connectors; Deformation; Ductility; Flooring; Friction; High rise buildings; Joints; Load; Mathematical models; Measurement; Mechanical properties; Prototypes; Shear; Shear (Mechanics); Shear strength; Steel; Structural steels; Testing; Trusses (Building); Yield stress
• ISSN: 0889-3241; 1944-7361
• DOI: 10.14359/51689255

The structural performance of a steel belt truss-to-concrete mega column connection in a 123-story building was studied. For the connection, a four-story-high steel belt truss is connected to the exterior face of the concrete mega columns by hundreds of shear connectors that consist of embedded shear plates and dowel bars. In this study, shear tests were performed for short connection specimens with a unit length of 900 mm (35.4 in.). The peak strength, residual strength, and stiffness were investigated using various shear-transfer mechanisms, such as concrete bearing, shear friction, and strut-and-tie mechanism. Based on the results, a behavior model for the shear connection unit was proposed. The proposed model was applied to nonlinear numerical analysis for the prototype shear connection with the full length of 14,400 mm (47.2 ft). The strength, displacement, and force redistribution of the prototype connection were investigated under the service and ultimate load conditions.