Abstract
This paper presents experimental results and finite element analysis of the cold-formed steel bolted connection under shear loading. Experiments are conducted to study the ultimate behaviors, such as ultimate strength and failure mode of connections. The samples were fabricated into three different groups, single bolted, double bolted and quadruple bolted connection. Material properties were determined by tensile coupon testing. Bearing failure modes were detected in the bolted connection tests. The ultimate capacities were compared with the nominal strengths calculated using the AISI (2012). The comparisons show that the nominal strength parameters predicted by this specification is conservative. The finite element analysis shell elements were used to model the cold-formed steel plate while solid elements were used to model the bolted fastenings for the purpose of studying the structural behavior of bolted connections. Material nonlinearities, contact problem and geometry nonlinearities analysis are carried out in order to predict ultimate strength and failure mode of connections. The results show that the proposed model accurately represents the failure mode and ultimate strength of bolted connection, as determined from experimental investigation. The new factor for type of bearing connection has a good agreement with the tested bearing strength of bolt connection.
Highlights
Fastened joints are critical components in cold-formed steel structures
The specimens with various configurations were designed by varying the number of bolt as single shear, double shear and quadruple shear bolted connections
Loaddeformation and the ultimate capacity of finite element model were in good agreement with the experimental results
Summary
Fastened joints are critical components in cold-formed steel structures. The member in the jointed components and stress concentration around the hole are very complex to design. Practical design of cold-formed steel connections are designed as pinned. The structural behavior of bolted connections in cold-formed steel structure is quite different from hot-rolled steel, mainly because of the thickness of the connected parts. The Finite Element Analysis (FEA) can be used to predict the failure behavior of cold-formed steel structure. Numerical investigation based on the nonlinear finite element method is more effective method to analyze cold-formed steel behavior. The methods available to consider the behavior of cold-formed sections include experiment investigation, analytical method based on the governing differential equations, finite-element method, and finite strip method. The design standards of coldformed steel bolted connections available in the current practical design include, the American Iron and Steel Institute [2], Australian/New Zealand Standard [3] and Eurocode 3 Part 1-4 [4]. All design standards were modified from design standards of hot-rolled steel with modifications as experimental works
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