An Investigation on the Ultimate Strength of Cold-Formed Steel Bolted Connections

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.

Structural performance of automated multi-depth shuttle warehouses (AMSWs) under low-to-moderate seismic actions

“…32 (Konkong 2017)], and they should be avoided to appear before ductile Fig. 32 Brittle failure of diagonals in bracing towers (Konkong 2017) failure modes in a seismic loading condition. Although the bearing is more ductile than the net-section and the bolt-shear failures, such yielding phenomena still relies on the local plasticity around the bolt holes (Bernuzzi and Castiglioni 2001), and in case of cyclic loading, its contribution is strongly influenced by the sequence of the loading.…”

Theoretical and Experimental Investigations on 20 Inches Threaded Casing Connections Failure under Field Conditions

“…At 2mm reduction of the pin thread diameter, the axial displacement of the box connection, given by (1) representing an about 10 thread lead.…”

“…The casing manufacturer, according to references standards, assembles in the factory the coupling (box) at one casing threaded end (threaded casing connections-factory assembled), and during the well casing, the other threaded end of the casing is assembled in the operation field (threaded casing connections-borehole assembled), by makeup to the coupling (box) of another casing (Figure 2). Deviations of shape and dimensions of the threaded casing connection can conduct to failure, often manifested by losing the sealing capacity and, more seriously, by jump-out or even by fracture of the thread connection [1]. Therefore, the international standards in the petroleum field predict the dimensions of the threaded casing connections used for well casing to fit within in a very restrictive tolerance field.…”

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