Abstract
The purpose of the measurements has been to determine the time-dependent force variation in the tendons. The measurements have now been performed during 14 years and the results are reported here. Measurements can continuously be carried out also in the future. The tendon forces are decreasing with time. The force reduction is the sum of the following three parts: stress loss due to concrete shrinkage, concrete creep and prestressing steel relaxation. The measurement results can be compared with the originally assumed long-time prestress losses. The force decrease in the tendons follow a straight line when illustrated in a diagram with logarithmic time-axis. At the distinct temperature-rise in the building when power generation started 4-5 years after prestressing this line will get a sharp bend so that the latter part of the line will have a greater slope than the former part. The prestressing force losses extrapolated to 30 years are just less than half the losses assumed in the design calculations. These favourable results from measurements during 14 years are valuable with respect to the actual structure and also to other structures of same or similar kind. The measurements have been made possible from the fact that the tendons have
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Citation Formats
Hallbjoern, L.
Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1.
Sweden: N. p.,
1991.
Web.
Hallbjoern, L.
Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1.
Sweden.
Hallbjoern, L.
1991.
"Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1."
Sweden.
@misc{etde_10113208,
title = {Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1}
author = {Hallbjoern, L}
abstractNote = {The purpose of the measurements has been to determine the time-dependent force variation in the tendons. The measurements have now been performed during 14 years and the results are reported here. Measurements can continuously be carried out also in the future. The tendon forces are decreasing with time. The force reduction is the sum of the following three parts: stress loss due to concrete shrinkage, concrete creep and prestressing steel relaxation. The measurement results can be compared with the originally assumed long-time prestress losses. The force decrease in the tendons follow a straight line when illustrated in a diagram with logarithmic time-axis. At the distinct temperature-rise in the building when power generation started 4-5 years after prestressing this line will get a sharp bend so that the latter part of the line will have a greater slope than the former part. The prestressing force losses extrapolated to 30 years are just less than half the losses assumed in the design calculations. These favourable results from measurements during 14 years are valuable with respect to the actual structure and also to other structures of same or similar kind. The measurements have been made possible from the fact that the tendons have not been cement-grouted. They were left in their ducts with a corrosion protection of circulating dried air. (au).}
place = {Sweden}
year = {1991}
month = {Jan}
}
title = {Long-time measurements of prestressed tendon forces in reactor containment, Forsmark nuclear power station, unit 1; Laangtidsmaetning av spaennkabelkrafter i reaktorinneslutning, Forsmark 1}
author = {Hallbjoern, L}
abstractNote = {The purpose of the measurements has been to determine the time-dependent force variation in the tendons. The measurements have now been performed during 14 years and the results are reported here. Measurements can continuously be carried out also in the future. The tendon forces are decreasing with time. The force reduction is the sum of the following three parts: stress loss due to concrete shrinkage, concrete creep and prestressing steel relaxation. The measurement results can be compared with the originally assumed long-time prestress losses. The force decrease in the tendons follow a straight line when illustrated in a diagram with logarithmic time-axis. At the distinct temperature-rise in the building when power generation started 4-5 years after prestressing this line will get a sharp bend so that the latter part of the line will have a greater slope than the former part. The prestressing force losses extrapolated to 30 years are just less than half the losses assumed in the design calculations. These favourable results from measurements during 14 years are valuable with respect to the actual structure and also to other structures of same or similar kind. The measurements have been made possible from the fact that the tendons have not been cement-grouted. They were left in their ducts with a corrosion protection of circulating dried air. (au).}
place = {Sweden}
year = {1991}
month = {Jan}
}