EXPERIMENTAL VERIFICATION OF NEW METHODOLOGY FOR CALCULATING OF THE FLEXIBLE FERROCONCRETE FOUNDATION OF THE FIRST LIMIT STATE

2016 ◽  
Vol 4 (4) ◽  
pp. 0-0
Author(s):  
Владимир Дыба ◽  
Vladimir Dyba ◽  
Максим Матвиенко
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Experimental Verification ◽  
Limit State ◽  
Strength Characteristics ◽  
New Method ◽  
Sandy Ground

The article discusses the problem of discrepancy of normative methods for calculating the bearing capacity of foundations experimental data. The authors proposed a new method of calculation of flexible ferroconcrete foundation, which can eliminate a large gap between the calculated and experimental data. The article describes an experiment on a sandy base, and its results, confirming the new methodology. The use of bilinear limit line τ (σ) for the calculation of the strength characteristics of dense sandy ground is describes.

scholarly journals Conparison Effect of the Method of Calculation of Foundation on the First Limit State

2017 ◽  
Vol 5 (1) ◽  
pp. 25-30
Author(s):  
Максим Матвиенко ◽  
Maksim Matvienko ◽  
Владимир Дыба ◽  
Vladimir Dyba ◽  
Валентина Ильинова ◽  
...  
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Standard Method ◽  
Limit State ◽  
New Method ◽  
Method Of Calculation

In this article discusses the problem discrepancy normative methods for calculating the bearing capacity of foundations experimental data and the new method, taking into account the joint interaction of the foundation and the base. The calculated cost of the foundation de-signed according to a standard method and the new method. Examined the economic feasibil-ity of the use of foundations designed by a new method

Upper bound to bearing capacity of layered soils

1989 ◽  
Vol 26 (4) ◽  
pp. 730-736 ◽  
Author(s):  
Antoni Florkiewicz
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Limit State ◽  
Layered Soils ◽  
Flat Punch ◽  
Layer System ◽  
Capacity Limit ◽  
Strip Footings ◽  
Kinematical Approach ◽  
Layered Half Space

An approach to the problem of flat punch indentation into the Mohr-Coulomb layered half-space has been developed, based on the kinematical approach of limit analysis. A kinematically admissible plane-strain failure mechanism for a typical two-layer system is presented. The ultimate bearing capacity for strip footings obtained from the proposed approach compares well with the experimental data available in the literature. Key words: bearing capacity, limit state analysis, layered soil, strip footings.

Evaluation of the Bearing Capacity of the Concrete Pier Exposed to the Freeze-Thaw Cycles

2012 ◽  
Vol 166-169 ◽  
pp. 1216-1221
Author(s):  
Zi Yu Li
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Cross Section ◽  
Design Method ◽  
Limit State ◽  
Factors Affecting ◽  
Freeze Resistance ◽  
Freeze Thaw ◽  
Maximal Stress ◽  
Effective Depth

This paper has studied the evaluation of bearing capacity of concrete piers exposed to the freeze-thaw cycles. In this paper, based on the mechanism of freeze-thaw process, several factors affecting the freeze resistance of concrete were considered, and a regression model including the interaction of loads and freeze-thaw was established according to experimental data. Besides, a wholly new concept - the effective depth of the freeze-thaw has been introduced into the analyzing, and it also considers of the area of cross section reducing, which results in the stress concentration. It calculates the maximal stress by using the limit state design method, and finally judges its rank of damage.

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

Design and Research of Double-Drum Winch with Anti-Pressure Wheel

2012 ◽  
Vol 479-481 ◽  
pp. 1709-1713
Author(s):  
Kai An Yu ◽  
Tao Yang ◽  
Chang Zhi Gong
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Finite Element Methods ◽  
Design Method ◽  
New Method

In view of the problems of large stress and severe bearing heating in double-drum winch at present, this paper adopted a new method to enhance bearing capacity for double-drum winch by adding anti-pressure wheels between two drums. Finite element methods were used to analyze the strength of 4000kN-traction double-drum winches with anti-pressure wheels and without anti-pressure wheels respectively. The results of the analysis revealed that the stress of the cylinder bearing decreased from 264MPa to 167MPa. The new method by adding anti-pressure wheels had remarkably improved the endurance of the bearing. Therefore, the design method can be widely used in large-traction double-drum winch.

scholarly journals Influence of nanocellulose on the hydration process of Portland cement and concrete properties

2020 ◽  
Vol 17 (5) ◽  
pp. 155-160
Author(s):  
V. I. Khirkhasova ◽  
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Physical And Mechanical Properties ◽  
Cement Composite ◽  
High Density ◽  
Strength Characteristics ◽  
New Method ◽  
Concrete Properties ◽  
Hardening Process ◽  
Study Results

The paper deals with modification of cement composite and concrete with nanocellulose in low and high density. The author presents the study results of the influence of nanocellulose on the cement composite hardening process, as well as the physical and mechanical properties of heavy concrete. The influence of the used additive on the rheological and strength characteristics of concrete is revealed. A new method is proposed to improve the material performance.

Experimental Study on Bending Behavior of Timber Beams Reinforced with CFRP/AFRP Hybrid FRP Sheets

2011 ◽  
Vol 255-260 ◽  
pp. 728-732
Author(s):  
Qing Chun ◽  
Jian Wu Pan
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Bearing Capacity ◽  
Strain Distribution ◽  
Failure Modes ◽  
Bending Behavior ◽  
Timber Beams

Based on the experiment of timber rectangle beams made of pine and fir reinforced with CFRP/AFRP hybrid FRP (HFRP) sheets. The failure modes and bending bearing capacity and load-deflection curves and strain distribution at mid-span section were analyzed. The results showed that: Comparing with the specimens without being reinforced by HFRP, there is certain improvement in bending bearing capacity and stiffness of the specimens reinforced with HFRP respectively. Bending bearing capacity of the pine specimens improve 18.1%~62.0% and bending bearing capacity of the fir specimens improve 7.7%~29.7%. Stiffness of the pine specimens improve 13%~21%, and stiffness of the fir specimens improve 6%~10%. Based on the experimental data, the computing formulas of bending bearing capacity of timber rectangle beams made of pine and fir reinforced with HFRP were presented.

Gravidanotherapy

1934 ◽  
Vol 30 (11-12) ◽  
pp. 1078-1090
Author(s):  
M. E. Vinnikov
Keyword(s):  
Human Body ◽  
Experimental Verification ◽  
Well Being ◽  
Modern Medicine ◽  
The Other ◽  
New Method ◽  
Subjective Improvement ◽  
Clinical Observations ◽  
Other Hand ◽  
Methods Of Treatment

As any new method of treatment, gravidanotherapy is met with varying opinions. Some expect "miracles" from this method of treatment, believing that gravidanotherapy has found a new all-encompassing, excluding all other methods of treatment. On the other hand, there is an undeniable tendency to downplay or even completely deny the importance of gravidanotherapy. Finally, some authors consider gravidanotherapy as a method giving only subjective improvement of patients' well-being, the success of which is based on mass psychotherapy. Meanwhile, there is no doubt that gravidan, given its composition, should have a significant effect on the human body. It is only necessary that clinical observations and experimental verification give an unbiased assessment of the action of the drug and determine the place of gravidanotherapy in the arsenal of means of modern medicine.

scholarly journals Applying the dimensional method for valuation of the strength loss of cement compositions exposed to elevated temperatures

2018 ◽  
Vol 251 ◽  
pp. 02005
Author(s):  
Nikita Levashov ◽  
Marina Akulova ◽  
Olga Potemkina ◽  
Alla Sokolova ◽  
Yulia Sokolova
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Fire Resistance ◽  
Elevated Temperatures ◽  
Classical Method ◽  
Strength Loss ◽  
Ultimate State ◽  
Load Bearing Capacity ◽  
Full Scale Tests ◽  
Loss Of Strength

The paper presents the basis of the analytical model for calcu-lating the loss of strength in ce-ment compositions exposed to elevated temperatures. This model is to replace the classical method of calculating the fire resistance of the loss of load-bearing capacity. The experimental data were taken as initial indicators. Based on the implemented calculations it would become possible to predict the occurrence of ultimate state by loss strength and the reliability of practical indicators obtained by means of full-scale tests

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