Civil Engineering Reference
In-Depth Information
Figure 11:
Detailing of reinforcement in composite girder with RC-web and composite
dowels
(v) Shear connection
The verification of the longitudinal shear connection has to be proofed in accordance with
EN 199411. The number of required shear connectors equals the number of openings in the
steel plate. The required transversal reinforcement is determined based on a 45° strut-and-tie
model:
(8)
Equal spacing of shear connectors is allowed for hogging and sagging moment, if the
minimum shear connection degree acc. to EN 199411 is met. In contrast to EN 199411, equal
spacing is also allowed for steel sections without upper flange, if the following requirements
are met:
the shear connection degree is h ≥ 0.5;
the span is L ≤ 18.0 m;
the plastic moment capacity of the composite section must be equal to or smaller than
10-times the plastic moment capacity of the steel profile;
the curtailment of the dowel capacity must not incise the design longitudinal shear force
more than 25 %.
Equally spacing for steel sections without upper flange extend the range of EN 199411
and opens new interesting application fields for composite dowels.
For fatigue loading the longitudinal shear force has to be determined by elastic theory
and the curtailment of the dowel capacity must not incise the design longitudinal shear force.
Reason for this is the prevention of unacceptable deterioration of the connection due to plas-
tic force redistribution.
5. Fatigue strength
The fatigue design has to be carried out according to the fatigue load model of appropriate
standards. The fatigue design concept comprises
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