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Research Papers: Seismic Engineering

Excitation Tests on Elbow Pipe Specimens to Investigate Failure Behavior Under Excessive Seismic Loads

[+] Author and Article Information
Izumi Nakamura

Earthquake Disaster Mitigation Research
Division,
Hyogo Earthquake Engineering Research Center,
National Research Institute for Earth Science and
Disaster Resilience,
3-1 Tennodai,
Tsukuba, Ibaraki 305-0006, Japan
e-mail: izumi@bosai.go.jp

Naoto Kasahara

Professor
Department of Nuclear Engineering and
Management,
School of Engineering,
The University of Tokyo,
7-3-1, Hongo,
Bunkyo-ku, Tokyo 113-8656, Japan
e-mail: kasahara@n.t.u-tokyo.ac.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 25, 2017; final manuscript received September 6, 2017; published online October 4, 2017. Assoc. Editor: Steve J. Hensel.

J. Pressure Vessel Technol 139(6), 061802 (Oct 04, 2017) (11 pages) Paper No: PVT-17-1018; doi: 10.1115/1.4037952 History: Received January 25, 2017; Revised September 06, 2017

The accident at the Fukushima Dai-ichi Nuclear Power Plant (NPP) resulting from the 2011 Great East Japan Earthquake raised awareness as to the importance of considering Beyond Design Basis Events (BDBE) when planning for safe management of NPPs. In considering BDBE, it is necessary to clarify the possible failure modes of structures under extreme loading. Because piping systems are one of the representative components of NPPs, an experimental investigation was conducted on the failure of a pipe assembly under simulated excessive seismic loads. The failure mode obtained by excitation tests was mainly fatigue failure. The reduction of the dominant frequency and the increase of hysteresis damping were clearly observed in high-level input acceleration due to plastic deformation, and they greatly affected the specimens’ vibration response. Based on the experimental results, a procedure is proposed for calculating experimental stress intensities based on excitation test so that they can be compared with design limitations.

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References

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Figures

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Fig. 1

Configuration of the test specimen: (a) dimensions of the test specimen and (b) test setup

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Fig. 2

Input sinusoidal waves used in the excitation tests: (a) SW#1 and (b) SW#3

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Fig. 3

Outline of the measurement in the pipe-component test

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Fig. 4

Transfer function of SLE01 by the wide-band random input

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Fig. 5

Relation between input frequencies and amplification ratio under 1.5 m/s2 sinusoidal input (SLE01)

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Fig. 6

Transfer function of SLE05 by the wide-band random input and sinusoidal sweep excitations

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Fig. 7

Relation between maximum input acceleration and amplification ratio under the sinusoidal wave input

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Fig. 8

Load–deflection curve of SLE02 and SLE05: (a) SLE02, 0.2 m/s2 input (wide-band random), (b) SLE02, 1.5 m/s2 input, (c) SLE02, 5 m/s2 input, and (d) SLE05, 9 m/s2 input

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Fig. 9

Relation between the maximum input acceleration and maximum response acceleration and displacement at the weight (sinusoidal wave input): (a) input acc.–response acc. and (b) input acc.–response disp.

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Fig. 10

Typical failure mode obtained in the pipe-component tests (SLE02): (a) fatigue crack at the flank of the elbow and (b) penetration check test result

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Fig. 11

An example of the strain time histories at the flank of the elbow (SLE02, 5 m/s2_#01)

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Fig. 12

Cumulative strains through the excitation tests for SLE02, SLE03S, and SLE04: (a) SLE02, (b) SLE03S, (c) SLE04, and (d) location of strain measurement on the elbow section

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Fig. 13

Schematic illustration of process to obtain the fictitious elastic load, Lf [17]

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Fig. 14

Design fatigue curve [14] and the experimental results: (a) carbon steel pipe and (b) austenitic stainless steel pipe

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