Monday, July 11, 2011
Friday, March 11, 2011
Bolt Connections
Bolt connections
When a connection is subject to a load reversal or to dynamic loading, a shear connection which acts by shear stress in the bolt and bearing stress in the plates, is not acceptable.
By pretensioning of the bolts, however, a clamping pressure occurs between the connected parts which enables load to be transferred by frictional resistance.
Preloaded bolts exert a compressive stress on the connected plates. The compression gives rise to high frictional resistance, which enables load to be transferred between the connected parts.
When the applied load F exceeds the frictional resistance which is developed between the plates, the plates will slip relative to each other allowing the bolt to act in bearing.
Bolts which transfer load by friction are known as High Strength Friction Grip (HSFG) bolts. Controlled tightening of the bolts allows the frictional action to be quantified for design.
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