Fig. 1 Seismic shock absorber: (a) visco-elastic damper, (b) friction damper
Fig. 2 Seismic shock absorber: (a) concept of dynamic absorber, (b) dynamic absorber applied to piping
Fig. 3 Target piping system: (a) conceptual model, (b) FEM model
Fig. 4 Installation location of dynamic absorbers
Fig. 5 Installation location of dampers
Fig. 6 Comparison of frequency response analysis results
Fig. 7 Comparison of directional acceleration response analysis results at DA installation location
Fig. 8 Comparison of maximum combined stresses
Fig. 9 Comparison of reaction forces at the lowest support of piping: (a) X-dir., (b) Y-dir., (c) Z-dir.
Fig. 10 Changes in HCLPF regarding maximum combined stresses according to changes in log-standard deviations
Table 1 Results of mode analysis
Table 2 Changes in HCLPF of piping according to installation of dynamic absorbers and dampers
References
- KBC 2016, 2016, 건축구조기준, 국토교통부
- Bezler, P., Subudhi, M. and Hartzman, M., 1985, "Dynamic Analysis Independent Support Motion Response Spectrum Method," Vol. II, U.S. Nuclear Regulatory Commission, Washington, D.C., NUREG/CR-1677.
- Kwag, S., Kwak, J., Lee, H., Oh, J. and Koo, G.-H., 2018, "A Study on Application of Tuned Mass Damper to Piping System under Earthquake," Trans. of the KNS Spring Meeting, Jeju, May 17-18.
- Kwag, S., Kwak, J., Lee, H., Oh, J. and Koo, G.-H., 2019, "A Numerical Study on Improvement in Seismic Performance of Nuclear Components by applying Dynamic Absorber," J. Comput. Struct. Eng. Inst. Korea, Accepted for publication in Feb. 2019.
- EPRI, 1994, "Methodology for Developing Seismic Fragilities," Electric Power Research Institute, Palo Alto, CA, TR-103959.
- Kwag, S., Oh, J., Lee, J.-M., and Ryu, J.-S., 2017, "Bayesian-based seismic margin assessment approach: Application to research reactor," Earthq. Struct., Vol. 12, No. 6, pp. 653-663. https://doi.org/10.12989/EAS.2017.12.6.653