Experimental Study on Seismic Responses of Piping Systems With Friction—Part 1: Large-Scale Shaking Table Vibration Test

1995 ◽  
Vol 117 (3) ◽  
pp. 245-249 ◽  
Author(s):  
K. Suzuki ◽  
T. Watanabe ◽  
T. Mitsumori ◽  
N. Shimizu ◽  
H. Kobayashi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Earth Science ◽  
Three Dimensional ◽  
Power Spectra ◽  
Reduction Factor ◽  
Oil Refinery ◽  
Shaking Table ◽  
Piping Systems ◽  
Frictional Vibration

This report deals with the experimental study of seismic response behavior of piping systems in industrial facilities such as petrochemical, oil refinery, and nuclear plants. Special attention is focused on the nonlinear dynamic response of piping systems due to frictional vibration appearing in piping and supporting devices. A three-dimensional mock-up piping and supporting structure model wherein piping is of 30-m length and 200-mm diameter is excited by a large-scale (15 m × 15 m) shaking table belonging to the National Research Institute for Earth Science and Disaster Prevention in Tsukuba, Ibaraki. Power spectra of the response vibration and the loading-response relationship in the form of a hysteresis loop under several loading conditions are obtained. The response reduction effect caused by frictional vibration is evaluated and demonstrated in terms of “response reduction factor.”

Feasibility Study of Tank Failure Test With “E-Defense”

2002 ◽  
Author(s):  
Shojiro Oka ◽  
Kouichi Kajiwara ◽  
Tomohiro Itoh
Keyword(s):  
Feasibility Study ◽  
Large Scale ◽  
Earth Science ◽  
Shaking Table ◽  
Frame Structure ◽  
Test Facility ◽  
Specimen Handling ◽  
Kobe Earthquake ◽  
Preliminary Planning ◽  
Steel Frame Structure

After the 1995 Kobe earthquake in Japan, National Research Institute for Earth Science and Disaster Prevention started to construct a large-scale 3-D shaking table, called “E-Defense”. The facility is to be completed in 2005, and failure experiments of many kinds of structures are to be performed. As for a feasibility study of those experiments, a plan of a full-scale tank failure test was investigated. A steel cylindrical tank of 990m3 capacity was selected as a typical liquid storage tank. The height is about 15m and the diameter is about 10m. The total mass, with full of water, is about 1 MN (1,000 tonf). The tank is constructed on a steel frame structure for specimen handling and test facility protection, and set on the shaking table. To prevent facility failure due to a mass of water leakage, waterproof walls are necessary at the lower part of the frame. Ground motion recorded at the Kobe earthquake is applied to the shaking table, and elephant foot bulge buckling is expected to occur at the bottom portion of the tank. Through this preliminary planning, technical feasibility of tank failure tests was confirmed, and problems to be solved for actual planning were clarified.

scholarly journals Power spectrum of halo intrinsic alignments in simulations

2020 ◽  
Vol 501 (1) ◽  
pp. 833-852
Author(s):  
Toshiki Kurita ◽  
Masahiro Takada ◽  
Takahiro Nishimichi ◽  
Ryuichi Takahashi ◽  
Ken Osato ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Signal To Noise Ratio ◽  
Cosmological Parameters ◽  
Three Dimensional ◽  
Power Spectra ◽  
Acoustic Oscillations ◽  
Matter Power Spectrum ◽  
Sample Covariance ◽  
Non Linear

ABSTRACT We use a suite of N-body simulations to study intrinsic alignments (IA) of halo shapes with the surrounding large-scale structure in the ΛCDM model. For this purpose, we develop a novel method to measure multipole moments of the three-dimensional power spectrum of the E-mode field of halo shapes with the matter/halo distribution, $P_{\delta E}^{(\ell)}(k)$ (or $P^{(\ell)}_{{\rm h}E}$), and those of the auto-power spectrum of the E-mode, $P^{(\ell)}_{EE}(k)$, based on the E/B-mode decomposition. The IA power spectra have non-vanishing amplitudes over the linear to non-linear scales, and the large-scale amplitudes at k ≲ 0.1 h−1 Mpc are related to the matter power spectrum via a constant coefficient (AIA), similar to the linear bias parameter of galaxy or halo density field. We find that the cross- and auto-power spectra PδE and PEE at non-linear scales, k ≳ 0.1 h−1 Mpc, show different k-dependences relative to the matter power spectrum, suggesting a violation of the non-linear alignment model commonly used to model contaminations of cosmic shear signals. The IA power spectra exhibit baryon acoustic oscillations, and vary with halo samples of different masses, redshifts, and cosmological parameters (Ωm, S8). The cumulative signal-to-noise ratio for the IA power spectra is about 60 per cent of that for the halo density power spectrum, where the super-sample covariance is found to give a significant contribution to the total covariance. Thus our results demonstrate that the IA power spectra of galaxy shapes, measured from imaging and spectroscopic surveys for an overlapping area of the sky, can be used to probe the underlying matter power spectrum, the primordial curvature perturbations, and cosmological parameters, in addition to the standard galaxy density power spectrum.

scholarly journals Lagrangian approach to super-sample effects on biased tracers at field level: galaxy density fields and intrinsic alignments

2021 ◽  
Vol 2021 (11) ◽  
pp. 061
Author(s):  
Atsushi Taruya ◽  
Kazuyuki Akitsu
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Power Spectra ◽  
New Formalism ◽  
Long Wavelength ◽  
Local Structures ◽  
Field Level ◽  
The Galaxy ◽  
Galaxy Halo ◽  
Clustering Data

Abstract It has been recognized that the observables of large-scale structure (LSS) is susceptible to long-wavelength density and tidal fluctuations whose wavelengths exceed the accessible scale of a finite-volume observation, referred to as the super-sample modes. The super-sample modes modulate the growth and expansion rate of local structures, thus affecting the cosmological information encoded in the statistics of galaxy clustering data. In this paper, based on the Lagrangian perturbation theory, we develop a new formalism to systematically compute the response of a biased tracer of LSS, which is expressed perturbatively in terms of the matter density field of sub-survey modes, to the super-sample modes at the field level. The formalism presented here reproduces the power spectrum responses that have been previously derived, and provides an alternative way to compute statistical quantities with super-sample modes. As an application, we consider the statistics of the intrinsic alignments of galaxies and halos, and derive the field response of the galaxy/halo shape bias to the super-sample modes. Possible impacts of the long-mode contributions on the covariance of the three-dimensional power spectra of the intrinsic alignment are also discussed, and the signal-to-noise ratios are estimated.

Surge Waves Under Earthquake and Clastic Flow Landslide

2018 ◽  
Vol 12 (03) ◽  
pp. 1850009 ◽  
Author(s):  
Haixin Zhao ◽  
Lingkan Yao ◽  
Baoliang Wang ◽  
Sarfraz Ali
Keyword(s):  
Wave Height ◽  
Large Scale ◽  
Reduction Factor ◽  
Shaking Table ◽  
Water Tank ◽  
Ground Acceleration ◽  
Initial Water ◽  
Maximum Wave Height ◽  
Barrier Lake ◽  
Landslide Volume

This paper primarily investigates the surge wave of the barrier lake during an earthquake and clastic flow landslide simultaneously. Earthquakes can trigger clastic flow landslides with strong mobility enabling them to move a significant distance underwater. However, there have been few studies on the simultaneous superposition of seismic surge and clastic flow landslide until this study. First, we designed an experiment to analyze the influence of landslide motion under surging water; then, we investigated the effects of the clastic flow landslide and earthquake on the variation of surge wave height, with large-scale shaking table water tank model experiments. The experimental variables included the initial water depth, peak ground acceleration, landslide impact velocity, and landslide volume. According to the experimental results, we analyzed the maximum wave height under the combined action of an earthquake and clastic flow landslide. Furthermore, we defined a reduction factor of the seismic surge and put forward an equation to predict the reduction factor by means of dimensionless multiple linear fitting analysis. Finally, we present a method for calculating the maximum wave height of the combined surge during both an earthquake and clastic flow landslide using the reduction factor and provide a case to verify the reliability of the formula. Our study could provide the basis for the analysis of the burst of the barrier lake.

Experimental study of three-dimensional separation on a large-scale model

AIAA Journal ◽  
1995 ◽  
Vol 33 (11) ◽  
pp. 2107-2113 ◽  
Author(s):  
D. Barberis ◽  
P. Molton
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Three Dimensional ◽  
Scale Model ◽  
Large Scale Model

Introduction of E-Defense Project With Recent Progress: A 3-D Full-Scale Earthquake Testing Facility Under Construction

2004 ◽  
Author(s):  
Nobuyuki Ogawa ◽  
Koichi Kajiwara ◽  
Masayoshi Sato
Keyword(s):  
Large Scale ◽  
Earth Science ◽  
Three Dimensional ◽  
Full Scale ◽  
Fiscal Year ◽  
Disaster Prevention ◽  
Construction Work ◽  
Earthquake Disaster ◽  
Testing Facility ◽  
New Facility

After the great Hanshin-Awaji earthquake disaster, the National Research Institute for Earth Science and Disaster Prevention (NIED) and the Science and Technology Agency of the Japanese Government (STA) planned to build a three-dimensional, full-scale, earthquake-testing facility (E-Defense) as one of the core research facilities for earthquake disaster prevention. It is hoped to be able to carry large-scale structures and to simulate the process of dynamic collapse using three-dimensional, strong earthquake records. For this purpose, the NIED (http://www.bosai.go.jp) has developed large actuators and related components from 1995 and completed them in 1998. After that, the NIED and the STA began the design and construction of the new facility in the fiscal year of 1998, and now, the construction work is in final stage at Miki City, near Kobe, Japan. It is scheduled to be completed by the beginning of 2005. In this paper, the basic performance and features of this new facility and the outline of recent construction work are summarized.

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