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1
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Effect of relative humidity on shear modulus of particleboard

100%
Kociszewski M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2014
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tom 88
Effect of relative humidity on shear modulus of particleboard. The effect of relative humidity on the shear modulus of particleboard was presented in the paper. Panel specimens were conditioned at 55, 65, 75, 85 and 95% RH. The moisture content and shear modulus of particleboard were determined on these specimens by the twisted square piate method. The relationships between the shear modulus and the moisture content of particleboard and relative humidity were defined.
2
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Small strain stiffness in overconsolidated Pliocene clays

86%
Markowska-Lech K., Lech M., Bajda M., Szymanski A.
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
|
2013
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tom 45
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nr 2
A huge development of technical infrastructure, including the construction of many high-rise buildings, roads, railroads and extension of subway lines, took place over the recent years in Poland. Therefore, numerous planned investment projects require geotechnical data documenting the variation of soil parameters found in the subsoil. The shear wave velocity is one of the most important input parameters to represent the stiffness of the soil deposits. This paper focuses on the methods and devices using measurements of the shear wave velocity to estimate the initial shear modulus in cohesive soil. It is preferable to measure VS by in situ wave propagation tests, however it is often economically not feasible in all regions of Poland. Hence, a reliable correlation between shear wave velocity and parameters measured in triaxial cell or static penetration parameters would be a considerable advantage. This study shows results obtained from the bender elements tests and fi eld techniques – seismic cone penetration test and seismic flat dilatometer, performed on overconsolidated cohesive soils in Warsaw. On the basis of the test results possible correlations between shear wave velocity (initial shear modulus), mean effective stress and void ratio are considered and four original empirical relationships are proposed. Moreover, the proposed formulas by two different techniques using triaxial apparatus and also RCPT cone were examined. The proposed formulas show a reasonable agreement with direct shear wave velocity profiles for clays and might be incorporated into routine laboratory and field practice.
3
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Koncepcja oceny modułu odkształcenia postaciowego w gruntach spoistych na podstawie prędkości fali poprzecznej

72%
Markowska-Lech K., Gromek J.
Acta Scientiarum Polonorum. Architectura
|
2015
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tom 14
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nr 3
W niniejszej pracy zaproponowano empiryczne związki umożliwiające szacowanie modułu odkształcenia postaciowego (GMax) gruntu na podstawie standardowo określanych w badaniach parametrów geotechnicznych. Praca zawiera analizę wyników pomiarów prędkości fali poprzecznej w aparacie trójosiowego ściskania z piezoelementami typu bender, wykonanych na próbkach gruntów spoistych.
4

The use of seismic tests for determination of shear modulus in cohesive soils

72%
Markowska-Lech K., Lech M., Bajda M., Szymanski A.
Electronic Journal of Polish Agricultural Universities. Series Civil Engineering
|
2008
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tom 11
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nr 2
5
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Small-strain dynamic characterization of clayey soil

72%
Gabrys K., Sas W., Sobol E.
Acta Scientiarum Polonorum. Architectura
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2015
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tom 14
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nr 1
An appropriate evaluation of dynamic soil properties is important for proper seismic response analysis and soil modelling programs. The primary aim of this study was to investigate the dynamic properties of clayey soil from Warsaw area, taking into consideration some of the selected factors affecting the shear modulus (G) and the damping ratio (D) of examined samples. A series of resonant column tests were conducted to study the effect of applied pressure and shear strain amplitude on soil stiffness and its damping properties. These parameters were reviewed, investigated and discussed. On the basis of the results obtained from these tests as well as the theoretical analysis, it can be established that confining pressure and the range of considered strain had a significant influence on the dynamic shear modulus and on the dynamic damping ratio. The impact of stress level on D is also discussed.
6
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Dynamic and cyclic static loading behavior of silty-sandy clay at small and moderate strains

58%
Gabrys K., Sas W., Sobol E.
Acta Scientiarum Polonorum. Architectura
|
2016
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tom 15
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nr 4
The shear modulus (G) is one of the key parameters for seismic ground response analysis and it can be usually determined by means of dynamic tests (DT), such as resonant column test (RCT), or cyclic static test (CST), e.g. torsional shear (TST). The RC and TS tests are widely used laboratory methods to find stiffness of soil at small to medium strain range (0.0001–0.5%). The purpose of this paper is to present the experimental results from RC and CS laboratory tests on silty-sandy clay from the western part of Warsaw, Poland. The study aims to compare the shear modulus values obtained from two different research techniques. The influence of, in particular, the applied effective pressure, associated shear strain and experimental method (i.e. loading frequency and output amplitude) on the shear modulus at small strains (Gmax) and secant shear modulus (G) are investigated and proved. Generally, the results reveal that the examined soils stiffness calculated from TS tests is lower than from RC tests.
7

Viscoelastic properties of Jonagold apple flesh

58%
Golacki K., Stropek Z.
Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering
|
2001
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tom 04
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nr 2
Linear viscoelasticity of the studied material was assumed in the range of strain up to 0.08 mm/mm. A general Maxwell model was suggested to describe the reaction of apple sample to loading. In stress relaxation experiment two kinds of samples that had been cut from the same fruit were axially compressed. One specimen was free to expand in radial direction, while the other one was constrained in a rigid container.
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