Experimental research on the water cross section performance of porous concrete

2015 ◽  
Author(s):  
X. H. Bai ◽  
X. F. Liu ◽  
J. X. Li ◽  
Z. Z. Wang
Keyword(s):  
Cross Section ◽  
Experimental Research ◽  
Porous Concrete

scholarly journals Experimental Research on Reinforced Concrete Columns Strengthened with Steel Jacket and Concrete Infill

2021 ◽  
Vol 11 (9) ◽  
pp. 4043
Author(s):  
Aleksandar Landović ◽  
Miroslav Bešević
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Experimental Research ◽  
Failure Modes ◽  
Steel Tube ◽  
Rc Columns ◽  
Rc Column ◽  
Steel Jacket ◽  
Ductile Behavior

Experimental research on axially compressed columns made from reinforced concrete (RC) and RC columns strengthened with a steel jacket and additional fill concrete is presented in this paper. A premade squared cross-section RC column was placed inside a steel tube, and then the space between the column and the tube was filled with additional concrete. A total of fourteen stub axially compressed columns, including nine strengthened specimens and five plain reinforced concrete specimens, were experimentally tested. The main parameter that was varied in the experiment was the compressive strength of the filler concrete. Three different concrete compression strength classes were used. Test results showed that all three cross-section parts (the core column, the fill, and the steel jacket) worked together in the force-carrying process through all load levels, even if only the basic RC column was loaded. The strengthened columns exhibited pronounced ductile behavior compared to the plain RC columns. The influence of the test parameters on the axial compressive strength was investigated. In addition, the specimen failure modes, strain development, and load vs. deformation relations were registered. The applicability of three different design codes to predict the axial bearing capacity of the strengthened columns was also investigated.

scholarly journals Load carrying capacity of the eccentric joint in the truss made of open cross-sections

2018 ◽  
Vol 219 ◽  
pp. 02002
Author(s):  
Małgorzata Gordziej-Zagórowska ◽  
Elżbieta Urbańska-Galewska
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Experimental Research ◽  
Cross Sections ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Main Achievement ◽  
Joint Area ◽  
Load Carrying ◽  
Open Cross Section

The influence of eccentricity at intersections of truss members on the load carrying capacity of the truss joint is presented in the paper. The research truss elements were designed as cold-formed open cross section. Analytical calculations, numerical analysis and experimental research were conducted to reveal how the eccentricity affects the effort of material in the joint area. The results of analysis and investigations are compared and discussed. The main achievement of the tests carried out is statement that slender plane members of the compression chords are safe compared with the results of analytical calculations.

EXPERIMENTAL RESEARCH OF RC BEAMS IN COMBINATION WITH GLASS-PLASTIC BARS

2016 ◽  
Vol 2 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Смоляго ◽  
Gennadiy Smolyago ◽  
Фролов ◽  
Nikolay Frolov ◽  
Полоз ◽  
...  
Keyword(s):  
Cross Section ◽  
Experimental Research ◽  
Strain Condition ◽  
Glass Plastic ◽  
Rc Beams ◽  
Stress Strain ◽  
Bending Tests ◽  
Different Content

The results of bending tests of RC beams with different content (50 % and 100 %) of glass-plastic bars in tensioned area of cross-section are given in the article. Dependence between stress-strain condition parameters for such elements and quantity of glass-plastic bars is determined. All beams were ruptured by inclined section, what is explained in the article. This type of reinforcement is found out to be ineffective in comparison with traditional ones. Further research will consider portion of glass-plastic bars reduced to 30 % of total amount of reinforcement.

Recovery Technology Features of Aerospace Parts by Layering Synthesis

2016 ◽  
Vol 684 ◽  
pp. 316-322 ◽  
Author(s):  
V.G. Smelov ◽  
A.V. Sotov ◽  
A.V. Agapovichev
Keyword(s):  
Gas Turbine ◽  
Cross Section ◽  
Experimental Research ◽  
Process Parameters ◽  
Iterative Process ◽  
Microstructural Analysis ◽  
Recovery Process ◽  
Preparation Time ◽  
Turbine Engine ◽  
Reconstructed Surfaces

In this article, the method of the recovery process of aerospace parts developed. The methodology consists in selecting of multivariate iterative process parameters. Using this methodology can significantly reduce the technological preparation time of production and the proportion of experimental research. Researches of repair annular surfaces pins of gas turbine engine were conducted in order to confirm the developed technique. Appearance reconstructed surfaces studied macro-and microstructural analysis was carried out, as the microhardness of the cross-section thin section cladding measured.

Strain Analysis and Experimental Research of the Composite Beams

2013 ◽  
Vol 438-439 ◽  
pp. 654-657
Author(s):  
Ai Hong Han
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Experimental Research ◽  
Strain Analysis ◽  
Composite Beams ◽  
Strain Measurements ◽  
Plane Cross Section ◽  
Strain Data ◽  
Steel Composite

Through the comparative analysis of theoretical and experiment results, this paper proved that the formulas for solving the strain of composite beams are correct, and the strain is consistent with the plane cross-section assumption. In order to reduce the influence of friction, resin membranes were placed in steel-steel composite beams and aluminum-steel composite beams. The strain measurements were performed on composite beams with and without adding resin, the influence of friction between the composite beams is analyzed by the comparison of strain data,.

scholarly journals RESULTS OF EXPERIMENTAL RESEARCH OF GRAPHITE TUBULAR ELECTRIC HEATER WITH 2 MM CROSS SECTION

2017 ◽  
Vol 5 (2) ◽  
pp. 017-021
Author(s):  
I. S. Vavilov ◽  
◽  
A. I. Lukyanchik ◽  
P. S. Yachmenev ◽  
A. V. Lysakov ◽  
...  
Keyword(s):  
Cross Section ◽  
Experimental Research ◽  
Electric Heater ◽  
Tubular Electric Heater

Secondary flows in ducts of square cross-section

1972 ◽  
Vol 54 (2) ◽  
pp. 289-295 ◽  
Author(s):  
B. E. Launder ◽  
W. M. Ying
Keyword(s):  
Secondary Flow ◽  
Cross Section ◽  
Experimental Research ◽  
Friction Velocity ◽  
Rough Surfaces ◽  
Axial Flow ◽  
Secondary Flows ◽  
Main Emphasis

The paper presents the outcome of experimental research on turbulence-induced secondary flows in square-sectioned ducts. The main emphasis of the experiments has been on the measurement of the secondary flows in a duct with equally roughened surfaces. Here the secondary flow is a substantially larger proportion of the axial flow than is the case in smooth-walled ducts. With the secondary velocities normalized by the friction velocity, however, the resultant profiles for smooth and rough surfaces are the same, within the precision of the measurements.

Application of Perturbation Methodology and Directional Filtering for Early Rotor Crack Detection

1999 ◽  
Author(s):  
Paul Goldman ◽  
Agnes Muszynska ◽  
Donald E. Bently ◽  
Kenwood P. Dayton ◽  
Mauro Garcin
Keyword(s):  
Cross Section ◽  
Experimental Research ◽  
Degrees Of Freedom ◽  
Crack Detection ◽  
Shape Change ◽  
Dynamic Stiffness ◽  
Circular Cross Section ◽  
System Of Nonlinear Equations ◽  
Directional Filtering ◽  
Stiffness Reduction

This paper documents analytical and experimental research of the lateral and torsional responses of a cracked rotor to different types of excitation. The experimental research has been performed on a rotor rig, which emulate a turbogenerator. It includes driving motor coupled to the main rotor, a lateral nonsynchronous perturbation device, and a generator with an electrical field consisting of a constant component (constant torsional load) and a sinusoidal component, provided by a signal generator. The generator was used as a torsional nonsynchronous perturbation device. The midspan of the rotor was modified so that a section could be changed starting with a circular cross-section (undamaged rotor) to the cross-section with transverse crack. The lateral and torsional responses have been measured at two axial locations. The obtained lateral data was processed using directional filtering into forward and reverse components of the corresponding filtered elliptical orbits. The forward component of the lateral response to nonsynchronous perturbation allows to identify overall stiffness reduction and rotating stiffness asymmetry introduced by the change in midspan rotor cross-section, while the reverse component largly depends on the support asymmetry. The nonsynchronous torsional excitation allows identify of the system torsional dynamic stiffness and it’s reduction due to the crack. The ratio of the filtered to 1× or to the perturbation frequency rotor responses at two axial locations was considered as an indicator of a lateral mode shape change due to the crack. The experimental results are compared with the analytical model of the rotor response, which was obtained by the application of a perturbation method of small parameter to the system of nonlinear equations. The equations describe the rotor system with four lateral (two displacements and two inclination angles) and two torsional degrees of freedom.

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