الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Thin-walled cold-formed steel (CFS) constructions are frequently utilized in single-story buildings and are gaining popularity in multi-story and long-span structures. Due to their reliability and ease of installation, bolted connections are widely used in engineering structures especially in trusses. Cold-formed steel is also widely utilized due to its high strength-to-weight ratio and rapid formability. Consequently, the study of the shear-out capacity of the cold-rolled metal plate is extremely important for providing engineering guidance and enhancing the structural safety and economy. Because the design standards have shortcomings in calculating the capacity of the single bolt connections of the CFS truss joint. This thesis presents an experimental and numerical study of the behavior of a thin-walled steel truss connection connected by a single bolt subjected to shear.
In this research, thirty full-scale cold-formed steel truss connections single-bolted specimens with variable end distances (e), sheet thickness (t), and steel grade were tested. Of particular interest are the specimens’ maximum load capacity and detailed data of load-deformation curves. The behaviors exhibited by the connections are discussed, and the design capacities calculated from the current CFS design standards are compared to the experimental results of the connections. This study investigates the main factors contributing to the CFS truss connections’ ductile response to suggest recommendations for the connection design. This study also includes comparison of different sections and studies the effect of the flange on the bearing connection with the use of two types of materials and different thicknesses.
In the numerical phase ABAQUS software package for finite element analysis was utilized to carry out material and geometric nonlinear analyses, which included simulations of contact and fracture. In order to calibrate the suggested 3-D finite element models, their findings were compared with experimental investigations. Good agreement is found between the FE models utilizing the suggested method and the known test results of CFS bolted connections, showing the possibility of the proposed method for simulating CFS constructed with bolted connections.
After finishing the calibration phase, a parametric study was conducted. Several methods of calculating the ultimate capacity were proposed based on different failure modes of this type of connections. A newly proposed equation that is significantly more accurate than the AISI code equations was developed. The proposed equation, which includes the diameter of the bolt as a parameter, is validated using test specimens with end distances as small as 1.5 times the diameter of the bolt hole. At last, a brief overview of the research and the analysis covered in this thesis is provided, along with some overarching findings.