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@PHDTHESIS{Nitsch:56636,
      author       = {Nitsch, Andreas},
      othercontributors = {Hegger, Josef},
      title        = {{S}pannbetonfertigteile mit teilweiser {V}orspannung aus
                      hochfestem {B}eton},
      volume       = {13},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-118725},
      isbn         = {3-9807302-2-0},
      series       = {Schriftenreihe des IMB},
      pages        = {Getr. Zählung : graph. Darst.},
      year         = {2001},
      note         = {Aachen, Techn. Hochsch., Diss., 2001},
      abstract     = {The behaviour of prestressed and precast members made of
                      high strength concrete is strongly influenced by the
                      increase in bond strength of the pretensioning tendons. In
                      this paper the investigation results of the bond properties
                      of prestressing steel in the transmission zone of prestress,
                      in the area of cracks and in the anchorage zone are
                      presented. In order to investigate the behaviour of
                      prestressed and precast members made of HSC a series of
                      pull-out tests, tests for the introduction of prestressing
                      forces as well as tests on axially tensioned test-specimens
                      and on different partially prestressed beams were carried
                      out. The investigations resulted in considerably higher
                      bonding forces in HSC containing silica fume, which are
                      additionally influenced by lateral strains depending on the
                      stress when tendons are released. This leads to a
                      considerable reduction of the transmission length by
                      transfer of prestress. Despite this, the required concrete
                      coverage of tendons is no more than is necessary for normal
                      strength concrete. The increase in bond strength results in
                      an effective control of cracking by using smooth strands. In
                      this way a design draft was developed in order to control
                      crack width of partially prestressed members by strands
                      only. The anchorage of pretensioned tendons at ultimate
                      limit state is guaranteed, when the anchorage zone is free
                      of cracks. Taking into account the influence of lateral
                      strains in the anchorage zone with cracks, a bilinear bond
                      strength characteristic of tendons should be used for
                      design. The development of design codes for transfer of
                      prestress, for control of cracking and for the anchorage
                      zone of pretensioned tendons leads to a more cost-effective
                      design for partially prestressed and precast high strength
                      concrete girders.},
      cin          = {300000},
      ddc          = {620},
      cid          = {$I:(DE-82)300000_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      urn          = {urn:nbn:de:hbz:82-opus-2119},
      url          = {https://publications.rwth-aachen.de/record/56636},
}