Testing of demountable shear connectors

Karakuş, Berk
In composite beams, the concrete deck cannot be easily demounted from the steel I-section if welded headed stud connectors are used. A new demountable shear connector was developed as a part of this thesis to promote sustainable composite construction. The connector is composed of two angle sections and a high-strength bolt. The proposed system has been studied through a three-phase experimental program. In the first phase, 33 push-out experiments were conducted to determine the shear load-carrying capacity. The size of the angle section, bolt diameter, bolt grade, concrete strength, loading direction, and bolt thread conditions were considered as the parameters. The results showed that the proposed connector system provides shear capacities that range between 150 kN and 330 kN and shows ductile behavior. In the second phase, six pull-out experiments were conducted to determine the tensile load-carrying capacity. The size of the angle sections and total height were considered as the parameters. The experimental results showed that the proposed connector provides tensile capacities that range between 50 kN and 90 kN. In the third phase of the study, four full-scale beam specimens with varying degrees of composite action were tested to demonstrate the applicability of the proposed connectors. The bending resistance provided by the beams was similar to the ones calculated using the conventional rigid plastic analysis of stress blocks. The concrete decks were easily demounted after the beam tests demonstrating the applicability of the proposed system for practical applications.


Composite shear stud strength at early concrete ages
Topkaya, Cem; Williamson, EB (American Society of Civil Engineers (ASCE), 2004-06-01)
Composite action between a reinforced concrete deck and steel girders is usually achieved by making use of welded headed shear studs. The mechanics of shear studs embedded in mature concrete has been investigated extensively in the past. Current literature, however, lacks experimental evidence of steel-concrete interface behavior at early concrete ages. This information is useful in understanding the behavior of bridges during construction. Current testing methods are not suitable for determining the respon...
Strengthening of reinforced concrete frames with engineered cementitious composite panels
Ayatar, Mehmet Engin; Canbay, Erdem; Binici, Barış (Thomas Telford Ltd., 2020-04-01)
Infill walls in reinforced concrete frames are susceptible to failure owing to their brittle nature. Their interaction with boundary columns during earthquakes may also cause shear damage in the columns. It is crucial to employ effective seismic strengthening strategies in order to mitigate the seismic risk induced by the infill walls. In this study, a new strengthening technique, conducted by bonding engineered cementitious composite (ECC) precast panels onto infill walls, was investigated. Three reinforce...
Evaluation of the Predictive Models for Stiffness, Strength, and Deformation Capacity of RC Frames with Masonry Infill Walls
Turgay, Tahsin; Durmus, Meril Cigdem; Binici, Barış; Ozcebe, Guney (American Society of Civil Engineers (ASCE), 2014-10-01)
Buildings with masonry infill walls (MIWs) in reinforced concrete (RC) frames are commonly used all around the world. It is well known that infill walls may affect the strength, stiffness, and displacement ductility of the structural system. Different approaches have been adopted in different codes and guidelines to consider the stiffness and strength contribution of MIWs on RC frame behavior. This study compares the ability of the existing guidelines to estimate stiffness, strength, and deformability of RC...
Investigation of Beam Specimen Geometries under Four Point Asymmetric Bending for Shear Mode Fracture Toughness Measurements of Rocks
Alkan, Uğur; Tutluoğlu, Levend (null; 2016-06-26)
Four-point asymmetric bending beam geometry can conveniently be used in shear mode fracture testing of rock and concrete-like materials. Stress intensity factors are computed by contour integration procedure embedded in a finite element program package. To achieve pure shear mode state, loading configuration and parameters are varied in models of rectangular beams. Beam depth is varied as 40, 50, and 60 millimeters. Initial crack length/beam depth ratio (a/W) is varied between 0.15 and 0.60. Pure shear cond...
Analysis of welding parameters in gas metal arc welding by a welding robot
Erener, Yavuz; Arıkan, Mehmet Ali Sahir; Department of Mechanical Engineering (2006)
In Robotic Gas Metal Arc Welding process, the welding parameters controlled by the welder (travel speed of the welding torch, wire feed speed, current, voltage, wire diameter, etc.) should be considered to obtain a desired welding quality. To design an appropriate welding model for the used equipment, the effects of each parameter should be studied by carrying out an adequate number of experiments. The welding process is described by analyzing the experimental data to define the relationships between the we...
Citation Formats
B. Karakuş, “Testing of demountable shear connectors,” M.S. - Master of Science, Middle East Technical University, 2022.