Research in Model Testing Pier-Foundation Hysteretic Property in Passenger Dedicated Line

2010 ◽  
Vol 37-38 ◽  
pp. 949-952
Author(s):  
Ming Bo Ding ◽  
Xing Chong Chen
Keyword(s):  
Cyclic Loading ◽  
Failure Mechanism ◽  
Constitutive Relation ◽  
Model Testing ◽  
Static Method ◽  
Test Model ◽  
Plastic Energy ◽  
Hysteretic Property ◽  
Testing Method ◽  
Energy Dissipated

The hysteretic and skeleton curves of load-displacement relation in pier top were got through the model-testing method of pile-soil interaction. The test model of pier was analyzed through static method-pushover. The complexity of subsoil property and constitutive relation of subsoil under reversal cyclic loading was considered. The model characteristics of energy dissipated, hysteretic property, ductility, failure mechanism and plastic energy of the pier under the horizontal reversal cyclic loading were researched.

scholarly journals The Sensitivity of an Electro-Thermal Photovoltaic DC–DC Converter Model to the Temperature Dependence of the Electrical Variables for Reliability Analyses

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2865 ◽  
Author(s):  
Wieland Van De Sande ◽  
Simon Ravyts ◽  
Omid Alavi ◽  
Philippe Nivelle ◽  
Johan Driesen ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Thermal Model ◽  
Computation Time ◽  
Capital Expenditures ◽  
Plastic Energy ◽  
Main Research ◽  
Die Attach ◽  
Bond Wire ◽  
Energy Dissipated ◽  
Method Model

The operational expenditures of solar energy are gaining attention because of the continuous decrease of the capital expenditures. This creates a demand for more reliable systems to further decrease the costs. Increased reliability is often ensured by iterative use of design for reliability. The number of iterations that can take place strongly depends on the computational efficiency of this methodology. The main research objective is to quantify the influence of the temperature dependence of the electrical variables used in the electro-thermal model on the reliability and the computation time. The influence on the reliability is evaluated by using a 2-D finite elements method model of the MOSFET and calculating the plastic energy dissipation density in the die-attach and the bond wire. The trade-off between computation time of the electro-thermal model in PLECS (4.3, Plexim, Zurich, Switzerland) and generated plastic energy accuracy obtained in COMSOL (5.3, COMSOL Inc., Burlington, MA, USA) is reported when excluding a certain temperature dependence. The results indicate that the temperature dependence of the input and output capacitors causes no change in the plastic energy dissipated in the MOSFET but does introduce the largest increase in computation time. However, not including the temperature dependence of the MOSFET itself generates the largest difference in plastic energy of 10% as the losses in the die are underestimated.

Failure mechanism and constitutive relation for an anchorage segment of an anchor cable under pull-out loading

2020 ◽  
Vol 231 (8) ◽  
pp. 3305-3317 ◽  
Author(s):  
S. R. Wang ◽  
Y. H. Wang ◽  
J. Gong ◽  
Z. L. Wang ◽  
Q. X. Huang ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Constitutive Relation ◽  
Anchor Cable ◽  
Pull Out

Performance of Cross Bracings under Reverse Cyclic Loading

2011 ◽  
Vol 250-253 ◽  
pp. 1774-1780
Author(s):  
Zuo Zhou Zhao ◽  
Qin Zhi Liu ◽  
Jia Ru Qian
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Slenderness Ratio ◽  
Seismic Retrofit ◽  
Thickness Ratio ◽  
Performance Based Design ◽  
Hysteretic Property ◽  
Fracture Ductility ◽  
Design Requirements

Steel braces are widely used in seismic retrofit of buildings. However, their tendency of buckling under compression impairs their efficacy. In this paper, characteristics of a cross bracing with rigid intersection, including its bearing capacity, hysteretic property and fracture ductility are investigated. With the analysis results, performance-based design requirements of a steel cross bracing are proposed based on its width-thickness ratio and effective slenderness ratio.

RCS scale-model-testing method by variance in the size for simply shaped scatterers

1995 ◽  
Vol 12 (2) ◽  
pp. 177-180 ◽  
Author(s):  
Liu Hongwei ◽  
Shi Zhendong ◽  
Tang Pu
Keyword(s):  
Model Testing ◽  
Scale Model ◽  
Testing Method

Liquefaction potential evaluations: energy-based method versus stress-based method

2013 ◽  
Vol 50 (10) ◽  
pp. 1088-1099 ◽  
Author(s):  
Takaji Kokusho
Keyword(s):  
Cyclic Loading ◽  
Strain Energy ◽  
Seismic Energy ◽  
Triaxial Tests ◽  
Sand Layer ◽  
Cyclic Triaxial Tests ◽  
Liquefaction Potential ◽  
Significant Difference ◽  
Sand Deposit ◽  
Energy Dissipated

A dataset of undrained cyclic triaxial tests for liquefaction with parametrically changing relative density and fines content is reviewed and interpreted in the scope of energy. It is found that the strain amplitude or pore-pressure buildup during cyclic loading is uniquely correlated not only to the energy dissipated in soil specimens, but also to strain energy given from outside. Hence, an energy-based method (EBM) is developed in which liquefaction potential can be evaluated by comparing strain energy for liquefaction in a sand layer with upcoming seismic energy without regard to the differences in seismic motions. Comparative studies in soil models demonstrate that the effect of various input motions is intrinsically included in EBM, whereas it has to be considered by choosing proper coefficients in a conventional stress-based method (SBM). Another significant difference is that liquefaction potential tends to be higher for a shallower depth in EBM, while it is vice versa in SBM in a uniform sand deposit.

Coupling Control and Analytical Model of the Shaker on a Centrifuge

2011 ◽  
Vol 418-420 ◽  
pp. 2110-2113
Author(s):  
Yong Zhi Wang ◽  
Xiao Ming Yuan ◽  
Rui Sun
Keyword(s):  
Systems Theory ◽  
Failure Mechanism ◽  
Analytical Model ◽  
Dynamic Characteristics ◽  
Unique Function ◽  
Analytical Models ◽  
Testing Method ◽  
Waveform Distortion ◽  
Exploratory Stage ◽  
Reduced Scale

With the unique function of simulating a combined environment of high static fields and shaking load, centrifugal shakers can provide an effective and advanced testing method to dynamic characteristics and failure mechanism of reduced scale structure models and materials. Their construction has begun both at home and abroad, whereas waveform distortion and instability often happen to the perfect shakers after installed on a centrifuge in the process of their construction. The knowledge about this phenomenon is difficult to find and systems theory is absolutely blank. Practically the construction of centrifugal shakers is still in an exploratory stage. This paper analyses coupling control of shakers on a centrifuge in three aspects of installation method, bucket deformation and arm deformation. Simultaneously corresponding analytical models is also established, aim to guide theory study and equipment design.

BepiColombo/MMO Thermal Test Model Testing

2011 ◽  
Author(s):  
Hiroyuki Ogawa ◽  
Tsutomu Yamazaki ◽  
Akira Okamoto ◽  
Naoko Iwata ◽  
Shun Okazaki ◽  
...  
Keyword(s):  
Model Testing ◽  
Test Model ◽  
Thermal Test
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