Behaviour of Pretensioned Bolts in Friction Connections Towards the Use of Higher Str

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Behaviour of Pretensioned Bolts in Friction Connections Towards the Use of Higher Strength Steels in Wind Towers

Author: Christine Heistermann | Size: 3.4 MB | Format: PDF | Quality: Unspecified | Publisher: Division of Structural and Construction Engineering – Steel Structures Department of Civil, Environmental and Natural Resources Engineering Luleå University of Technology | Year: 2001 | pages: 188

During recent years wind energy has established as an alternative to common
energy sources. To advance its competitiveness, the costs for the construction
of a wind tower have to be reduced. One possible option is the use of friction
grip joints instead of flange connections to join various tower segments in a
tubular steel tower. Additionally, the time necessary for installation and
maintenance of the bolts in these connections can be decreased, not only for
implementation in tubular towers but also in lattice towers.
Four different bolt types have been investigated with respect to the ease of
installation and maintenance on the one hand and structural applicability on the
other hand. The latter one is mainly defined by the behaviour of the pretension
force in the bolts. Various influences on the reduction of clamping force are
experimentally checked, such as the type and thickness of coating, the
thickness of the clamping package and external loading.
The slip factor, which plays an important role in friction connections, is
experimentally achieved in a test on a double shear lap joint. The experiment is
thoroughly examined by a finite element analysis, which models the interaction
between bolts and plates.
In various numerical analyses the influence of steel grade and possible
assembling tolerances on the resistance of a friction joint is investigated both
for single and double shear lap joints.

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