Full-scale, low-temperature mechanical testing of prestressing systems |
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Authors: | R Christen A Bergamini Dr K Ghazi Wakili |
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Institution: | (1) Laboratory for Structural Engineering, Materials Science and Technology (EMPA), Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland;(2) Laboratory for Applied Physics in Building, Materials Science and Technology (EMPA), Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland |
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Abstract: | For a number of industrial applications, concrete prestressing elements are exposed to extremely low temperatures during their
lifetime. This can cause concerns regarding their possible embrittlement. The investigation of the mechanical properties of
individual materials of these systems at different temperatures is a routine task. Numerical methods are a reliable method
for the calculation of stress and strain fields in complex geometry systems and load patterns, as long as a good knowledge
of initial and boundary conditions is available. Temperature-dependent material properties can also be taken into consideration.
The increased complexity of the calculations for a system under thermal and mechanical loads leads to a higher level of uncertainty
in the results, as its cost in terms of required input and computing time increases. The obstacles in the way to a reliable
numerical assessment of the safety of the operation of a prestressing system under extreme thermal conditions make the execution
of full-scale system tests advantageous, in spite of the costs arising from the development of suitable technical means. |
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Keywords: | Low temperature numerical methods thermal analysis structural testing environmental effects |
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