Evaluation of retention stresses of prestressing bars of a concrete ribbed panel from agricultural building after 20 years of service
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Kuupäev
2019
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Abstrakt
In Estonian agricultural buildings there exist a lot of precast concrete load-bearing
structures, which were manufactured in the 1970s and 80s. By now, some of these are rather near
for reaching their designed service life. 20 years old prestressed concrete ribbed ceiling panels
(type PNS-12) with the dimensions of 6 m (length) by 1.5 m (width) from an existing agricultural
building (pigsty) are the subject of current study. The objective of current study was to evaluate
the retention stress of prestressing bars (PSBs) of a ribbed panel PNS-12. In other words the
purpose was to find out how much of the factory-issued initial prestress was left at the PSBs after
20 years of service.
As a novel application in civil engineering strain gauges were applied in the evaluation of
retention stress of PSBs in current study. The active strain gauges were glued to the opposite sides
of PSBs at the middle-span of the ribbed panel, dummy gauges were glued to the unloaded steel
slab. Strain gauges were connected to the half-bridge and measured with strain indicator and
recorded. Retention stresses were calculated using the Hooke’s law through the measured strains
and elastic modulus of steel. Elastic modulus of PSBs was also measured using the universal
testing machine Instron 3369 and software Bluehill 2, based on two standards.
The results demonstrated about 20.8% and 10.0% of retention stress of PSBs, respectively. The
possible errors created by different aspects in experiment are also discussed.
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retention stress, precast, prestressed, concrete, ribbed panel, articles