Residual Static Strength of Concrete Cylinder Specimen and Stud Anchor Specimen after Cyclic Loadings

Kontani, Osamu; Ishitobi, Naoki; Kawada, Junya; Taogoshi, Noriaki; Koge, Makoto; Umeki, Yoshito

doi:10.3151/jact.14.634

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The residual anchor strength after cyclic loading is equal to or greater than (by up to 17%) the static strength of the specimen without cyclic loading according to Kontani et al (2016). This phenomenon shows a tendency similar to the results of the compression tests on the cylinder specimens after cyclic loading.…”

Section: Effect Of Cyclic Loading On Strength and Stiffnesssupporting

confidence: 81%

“…Ballatore and Bocca (1997) stated that dynamic loading reduces pore space in the concrete so that in the subsequent static compressive tests deformability is hindered by improved material compaction, and that strain hardening takes place all the same as is reflected in an increase in maximum load and reduced deformability. Comparing Kontani et al (2016) and Ballatore and Bocca (1997), both studies show similar strength increase of the cylindrical specimens, but different deformation behavior. Bocca and Cwtti (2003) stated that the test pieces subjected to preloading yielded more homogenous results, with a reduction in standard deviation, compared to non-preloaded test pieces probably because of a decrease in the stress peaks occurring in the material and a redistribution of stresses due to cyclic load induced creep.…”

Section: Effect Of Cyclic Loading On Strength and Stiffnessmentioning

confidence: 81%

“…According to the test results performed by Kontani et al (2016), cyclic loading increased the residual strength of the anchor specimens in tension as well as the cylinder specimens in compression. Regarding deformation, the cylinder specimens exhibited residual strain of around 250 micros with the maximum stress ratio of 0.33.…”

Section: Effect Of Cyclic Loading On Strength and Stiffnessmentioning

confidence: 99%

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Soundness Evaluation Method Using S-N Curve for Equipment Supports Subjected to Machine Vibrations

Kontani

Koge

Shimamoto

2021

ACT

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The degradation factors considered in the evaluation of long-term soundness of reinforced concrete structures in nuclear facilities in Japan are heat (high temperature), irradiation, carbonation, chloride penetration, alkali silica reaction, and machine vibration. As described in the "Guidelines for Maintenance and Management of Structures in Nuclear Facilities," the soundness evaluation of equipment supports against machine vibration is very rudimentary compared with the evaluation methods against other factors since the degradation state due to machine vibration cannot be identified until cracks are visually detected as degradation phenomena. The phenomenon of fatigue of equipment supports can be expressed using an S-N curve that shows the relation between the maximum stress ratio and the fatigue life under repeated loading. During normal operation of nuclear facilities, the maximum stress ratio of repeated load is very low and less than the long-term allowable stress level, and the fatigue life is very long. Since the number of load repetition can be known from the operation period of the facility, soundness against fatigue can be evaluated using an S-N curve. In this paper, a soundness evaluation method using an S-N curve for equipment supports subjected to machine vibrations is proposed.

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Section: Effect Of Cyclic Loading On Strength and Stiffnesssupporting

confidence: 81%