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Civil Engineering Association eBooks Journals, Papers and Presentations THERMAL RESPONSE OF REINFORCED CONCRETE STRUCTURES IN NUCLEAR POWER PLANTS

THERMAL RESPONSE OF REINFORCED CONCRETE STRUCTURES IN NUCLEAR POWER PLANTS
 ir_71

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11-24-2010, 06:30 AM
THERMAL RESPONSE OF REINFORCED CONCRETE STRUCTURES IN NUCLEAR POWER PLANTS

Author: Kaspar Willam, Yunping Xi , Keun Lee and Byunhun Kim | Size: 7.7 MB | Format: PDF | Publisher: University of Colorado at Boulder | Year: 2009 | pages: 210

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This is the report for a research project sponsored by Oak Ridge National Laboratory in 2008 –
2009. The objectives of the project were to review and summarize thermal responses of
reinforced concrete structures used in nuclear power plants. There are totally three parts of the
report. The first part focuses on responses of various materials under high temperatures
including concrete and steel, the second part on structural performances, and the third on spalling
damage of concrete under high temperatures.
The first part of the report includes several aspects: damage mechanisms of the materials under
high temperatures, available experimental results, current code specifications, and prediction
models for thermal responses of the materials. The material properties include strength, stiffness,
stress-strain relations, transport properties (e.g. thermal conductivity), short-term thermal
expansion, long-term thermal creep, shrinkage, and the interactive effects among temperature
variation, vapor diffusion, and mechanical loading in concrete. The bond behavior between
concrete and steel under high temperatures is also included. This part is listed as the first part of
the report, because thermal responses of reinforced concrete structures used in nuclear power
plants depend on thermal responses of materials such as concrete and steel under high
temperatures.
The second part of the report focuses on the structural responses of reinforced concrete structures
under high temperatures, such as beams, columns, and slabs. The second part of the review
includes available experimental results, current code specifications, and prediction models for
thermal responses of the reinforced concrete structures. In addition, we developed a numerical
model for characterizing high temperature responses of reinforced concrete beams. The model
prediction was compared with available test data in the literature and with predicted results by a
commercial finite element code.
The third part of the report is for spalling damage of concrete under high temperatures, which is
a special form of fire damage when the heating rate is very high. The review includes
experimental results, damage mechanisms, and theoretical and numerical analysis. A recently
developed numerical model and experimental results obtained by the authors were described in
detail together with a comprehensive literature review on spalling damage of concrete.

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