Earthquake simulator

1985 ◽  
Vol 78 (3) ◽  
pp. 1153-1153
Author(s):  
Bernard Devaure
Keyword(s):  
Earthquake Simulator

Physical and Numerical Simulations of the Seismic Response of a 1,100 kV Power Transformer Bushing

2018 ◽  
Vol 34 (3) ◽  
pp. 1515-1541 ◽  
Author(s):  
Guo-Liang Ma ◽  
Qiang Xie ◽  
Andrew S. Whittaker
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Numerical Simulations ◽  
Seismic Vulnerability ◽  
Power Transformer ◽  
Element Model ◽  
Ground Shaking ◽  
Earthquake Simulator ◽  
Physical Experiments ◽  
Seismic Tests

Power transformers and bushings are key pieces of substation equipment and are vulnerable to the effects of earthquake shaking. The seismic performance of a 1,100 kV bushing, used in an ultra-high voltage (UHV) power transformer, is studied using a combination of physical and numerical experiments. The physical experiments utilized an earthquake simulator and included system identification and seismic tests. Modal frequencies and shapes are derived from white noise tests. Acceleration, strain, and displacement responses are obtained from the uniaxial horizontal seismic tests. A finite element model of the 1,100 kV bushing is developed and analyzed, and predicted and measured results are compared. There is reasonably good agreement between predicted and measured responses, enabling the finite element model to be used with confidence for seismic vulnerability studies of transformer-bushing systems. A coupling of the experimental and numerical simulations enabled the vertically installed UHV bushing to be seismically qualified for three-component ground shaking with a horizontal zero-period acceleration of 0.53 g.

Earthquake Simulator

2021 ◽  
Author(s):  
Andras Guzman ◽  
Cristian Leon ◽  
Jose Vuelvas ◽  
Martha Manrique
Keyword(s):  
Earthquake Simulator

scholarly journals EQsimu: a 3-D finite element dynamic earthquake simulator for multicycle dynamics of geometrically complex faults governed by rate- and state-dependent friction

2019 ◽  
Vol 220 (1) ◽  
pp. 598-609 ◽  
Author(s):  
Dunyu Liu ◽  
Benchun Duan ◽  
Bin Luo
Keyword(s):  
Finite Element ◽  
Message Passing Interface ◽  
Fault System ◽  
Second Phase ◽  
Finite Element Code ◽  
Earthquake Cycle ◽  
Hexahedral Elements ◽  
Earthquake Simulator ◽  
State Dependent ◽  
Geometrically Complex

SUMMARY We develop a finite element dynamic earthquake simulator, EQsimu, to model multicycle dynamics of 3-D geometrically complex faults. The fault is governed by rate- and state-dependent friction (RSF). EQsimu integrates an existing finite element code EQdyna for the coseismic dynamic rupture phase and a newly developed finite element code EQquasi for the quasi-static phases of an earthquake cycle, including nucleation, post-seismic and interseismic processes. Both finite element codes are parallelized through Message Passing Interface to improve computational efficiency and capability. EQdyna and EQquasi are coupled through on-fault physical quantities of shear and normal stresses, slip-rates and state variables in RSF. The two-code scheme shows advantages in reconciling the computational challenges from different phases of an earthquake cycle, which include (1) handling time-steps ranging from hundredths of a second to a fraction of a year based on a variable time-stepping scheme, (2) using element size small enough to resolve the cohesive zone at rupture fronts of dynamic ruptures and (3) solving the system of equations built up by millions of hexahedral elements. EQsimu is used to model multicycle dynamics of a 3-D strike-slip fault with a bend. Complex earthquake event patterns spontaneously emerge in the simulation, and the fault demonstrates two phases in its evolution. In the first phase, there are three types of dynamic ruptures: ruptures breaking the whole fault from left to right, ruptures being halted by the bend, and ruptures breaking the whole fault from right to left. As the fault bend experiences more ruptures, the zone of stress heterogeneity near the bend widens and the earthquake sequence enters the second phase showing only repeated ruptures that break the whole fault from left to right. The two-phase behaviours of this bent fault system suggest that a 10° bend may conditionally stop dynamic ruptures at the early stage of a fault system evolution and will eventually not be able to stop ruptures as the fault system evolves. The nucleation patches are close to the velocity strengthening region. Their sizes on the two fault segments are different due to different levels of the normal stress.

ViscoSim Earthquake Simulator

2012 ◽  
Vol 83 (6) ◽  
pp. 979-982 ◽  
Author(s):  
F. F. Pollitz
Keyword(s):  
Earthquake Simulator

scholarly journals INTEGRATRED EARTHQUAKE SIMULATOR FOR SEISMIC RESPONSE ANALYSIS OF STRUCTURE SET IN CITY

2006 ◽  
Vol 23 (2) ◽  
pp. 297s-306s ◽  
Author(s):  
Muneo HORI ◽  
Tsuyoshi ICHIMURA ◽  
Hikaru NAKAMURA ◽  
Akihiko WAKAI ◽  
Takemasa EBISAWA ◽  
...  
Keyword(s):  
Seismic Response ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Earthquake Simulator

Seismic Testing of Eccentrically Braced Dual Steel Systems

1989 ◽  
Vol 5 (2) ◽  
pp. 429-449 ◽  
Author(s):  
Andrew S. Whittaker ◽  
Chia-Ming Uang ◽  
Vitelmo V. Bertero
Keyword(s):  
Building Research Institute ◽  
Large Size ◽  
Earthquake Simulator ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Earthquake Research ◽  
Strength And Stiffness ◽  
Experimental Values ◽  
The University ◽  
The U.S

Two six-story eccentrically braced dual steel systems (EBDSs) were tested as part of the U.S.-Japan Cooperative Earthquake Research Program. The first, a full-scale structure ( prototype) was pseudo-dynamically tested in the Large Size Structures Laboratory of the Building Research Institute in Tsukuba, Japan. The second, a similitude scaled replica of the first, was tested on the earthquake simulator at the University of California at Berkeley. The prototype was designed for the minimum earthquake forces specified by the 1981 Japanese Aseismic Code and satisfied the current earthquake-resistant design regulations in the U.S.A. (1985 UBC, 1984 ATC 3-06 and 1986 SEAOC). The performance of the EBDS (both prototype and model) was outstanding in terms of its elastic strength and stiffnesses during minor earthquake shaking and its ability to absorb and dissipate energy, without strength and stiffness degradation, during severe earthquake shaking. Substantial overstrengths of both EBDSs with respect to their nominal yielding strengths were observed during severe earthquake shaking. However, the response modification factors currently adopted by the ATC and SEAOC significantly overestimated the experimental values in both instances.

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