Investigation of the Seismic Safety Capacity of Aged Piping System: Shake Table Test on Piping Systems With Wall Thinning by E-Defense

Izumi, Norihiro; Otani, Akihito; Sato, Yuji; Takada, Hajime; Takahashi, Koji; Shibutani, Tadahiro

doi:10.1115/pvp2011-57560

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…In recent times, there has been a need for a design method that considers the plasticity and accompanying energy dissipation of the pipe to enhance the seismic design of piping systems in nuclear power plants. To date, vibration tests or analyses have shown that the response of a piping system decreases thanks to the plasticity of the pipe (Suzuki et al, 2005;Nakamura et al, 2011). However, piping analysis has been mainly based on elastic analysis, and plasticity was not considered.…”

Section: Introductionmentioning

confidence: 99%

Effect of the plasticity of pipe and support on the seismic response of piping systems

Okuda

Takahashi²,

WATAKABE

2023

Mechanical Engineering Journal

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This paper describes the results of seismic analyses conducted to clarify the effects of the plasticity of the pipe and its supports on the seismic response of the entire piping system. First, a study (Study 1) was performed to evaluate the effects of the plasticity of the pipe and its support independently, and of both the pipe and the support on the response of the entire piping system. Second, another study (Study 2) was performed to evaluate the effects of the magnitude of the yield load and post-yield stiffness on the restoring force characteristics of the supports. Study 1 produced remarkable insight on the seismic design of piping systems. The plasticity of the pipe and the support significantly reduced the support load and the elbow strain. In particular, the effect of the plasticity of the support was larger. Study 2 showed that the yield load of the support significantly affects the response of the piping system, whereas the post-yield stiffness does not affect much compared with the yield load.

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Section: Introductionmentioning

confidence: 99%

Effect of the plasticity of pipe and support on the seismic response of piping systems

Okuda

Takahashi²,

WATAKABE

2023

Mechanical Engineering Journal

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“…The elastic-plastic behavior, failure mode, and limit load were also analyzed using FEM [4,5]. Experiments have also been carried out to investigate the failure modes of major nuclear power plant piping components under cyclic loading [6], and to define the failure criteria of piping systems using the shaking table test [7]. Based on the results of these studies, the existing design methods that use linear analysis and stress-based criteria have been changed to methods that use inelastic analysis and strain-based criteria [8].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Limit State Assessment of a 3-Inch Carbon Steel Pipe Tee in a Nuclear Power Plant Using a Damage Index

et al. 2020

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Seismic motions are likely to cause large displacements in nuclear power plants because the main mode of their piping systems is dominated by the low-frequency region. Additionally, large relative displacement may occur in the piping systems because their supports are installed in several places, and each support is subjected to different seismic motions. Therefore, to assess the seismic performance of a piping system, the relative displacement repeated by seismic motions must be considered. In this study, in-plane cyclic loading tests were conducted under various constant amplitudes using test specimens composed of SCH 40 3-inch pipes and a tee in the piping system of a nuclear power plant. Additionally, an attempt was made to quantitatively express the failure criteria using a damage index based on the dissipated energy that used the force–displacement and moment–deformation angle relationships. The failure mode was defined as the leakage caused by a through-wall crack, and the failure criteria were compared and analyzed using the damage index of Park and Ang and that of Banon. Additionally, the method of defining the yield point required to calculate the damage index was examined. It was confirmed that the failure criteria of the SCH 40 3-inch carbon steel pipe tee can be effectively expressed using the damage index.

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“…Various procedures for the safety evaluation of network systems like electric powers, roads, hospital regional systems or hospitals, bridges or strategic buildings, were proposed in literature [15][16][17][18][19][20][21][22].…”

Section: Urban Risk Assessment and Reductionmentioning

confidence: 99%

Seismic Safety Evaluation of Historical Centres

Vanzi¹,

Biondi²,

Fiore³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Investigation of the Seismic Safety Capacity of Aged Piping System: Shake Table Test on Piping Systems With Wall Thinning by E-Defense

Cited by 9 publications

References 15 publications

Effect of the plasticity of pipe and support on the seismic response of piping systems

Effect of the plasticity of pipe and support on the seismic response of piping systems

Quantitative Limit State Assessment of a 3-Inch Carbon Steel Pipe Tee in a Nuclear Power Plant Using a Damage Index

Seismic Safety Evaluation of Historical Centres

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