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@PHDTHESIS{Blte:50311,
author = {Bülte, Sebastian},
othercontributors = {Hegger, Josef},
title = {{Z}um {V}erbundverhalten von {S}pannstahl mit sofortigem
{V}erbund unter {B}etriebsbeanspruchung},
address = {Aachen},
publisher = {Lehrstuhl und Inst. für Massivbau [u.a.]},
reportid = {RWTH-CONV-112861},
pages = {V, 187, 42 S. : zahlr. graph. Darst.},
year = {2008},
note = {Aachen, Techn. Hochsch., Diss., 2008},
abstract = {Slender and long-spanning structural members are a
characteristic of current architecture. Prestressing of
concrete reduces the required depth and extends the possible
span of girders and slabs. Therefore the influence of
sustained and cyclic loading becomes more and more
important. While many investigations on the influence on the
concrete and steel behavior are known, only very little
research on the influence on the interaction especially the
bond of prestressing strands was done yet. In the first part
of this work the bond behavior of prestressing strands in
the anchorage zone is described. Based on a database
covering approximately 400 test results a non-linear
approach is presented to describe the bond capacity of
strands considering the concrete strength. The influence of
cyclic loading on the bond anchorage of strands was tested
by more than 60 pull-out tests and 8 tests on prestressed
girders. These tests as well as numerical simulations
indicated that only high cyclic loading influences the bond
anchorage of strands. In this case the bond capacity of
strands should be reduced by one third in the area of the
flexural bond length. The transfer length remains unchanged
as long as no cracking arises in this area under cyclic
loading. The second part covers the influencing parameters
of the bond behavior on the load bearing of prestressed
girders considering the stress redistribution between
strands and reinforcing bars. Eight uniaxial tensile tests
revealed that the stress redistribution depends on the type
of the concrete as well as on the diameter of the steel.
Using common diameters of reinforcing bars and prestressing
strands stress redistribution from the strand towards the
bars as well as vice versa are possible in NSC. In HSC the
stress redistribution is always from the strand towards the
bar. Therefore the approaches of current standards (e.g.,
DIN 1045-1) overestimate the participation of the strands on
the load bearing. Based on the experimental and theoretical
investigations the current bond factor xi for prestressing
strands was adjusted. This work allows an overall
description of the bond behavior of prestressing strands
considering cyclic loading. With the proposed approaches the
anchorage zone can be designed safely even if cyclic loading
takes place. Furthermore, the load bearing as well as the
actual crack opening of prestressed girders can be predicted
correctly.},
keywords = {Spannstahl (SWD) / Verbund (SWD) / Vorspannung (SWD)},
cin = {311610},
ddc = {620},
cid = {$I:(DE-82)311610_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-25316},
url = {https://publications.rwth-aachen.de/record/50311},
}
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