scholarly journals Mechanical state analysis of different variants of piled rafts

2015 ◽  
Vol 10 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Michail Samofalov ◽  
Vytautas Papinigis ◽  
Mantas Tūnaitis
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Strain State ◽  
Design Methods ◽  
Current Paper ◽  
Stress And Strain ◽  
Bending Moments ◽  
Mechanical State ◽  
Piled Raft ◽  
Rational Case

Traditional raft design methods describe unpiled and fully piled rafts. The current paper aims to discuss intermediate raft design variants when the raft is at the same time partially supported by piles and partially rests on the ground. The loading conditions of all variants as well as mechanical properties assumed to be identical, general numerical simulation assumptions are also the same. The task is to analyse the stress and strain state of the raft for all variants (unpiled raft, partially piled raft, fully piled raft), to compare the results and to determine the most rational case. Raft settlements, bending moments and expenses of the materials are compared on the basis of the results.

scholarly journals Force and Deformation Characteristics during the Reconstruction and Expansion of Shallow Single-Tube Tunnels into Large-Span Multiarch Tunnels

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Yanling Jia ◽  
Yongxu Xia ◽  
Xindong Chen ◽  
Yongdi Zhou ◽  
Xingbo Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Great Influence ◽  
Surrounding Rock ◽  
Surface Subsidence ◽  
Stress And Strain ◽  
Partition Wall ◽  
Single Tube ◽  
Left And Right ◽  
The Right

At present, there are an ever-increasing number of tunnel expansion projects in China. Studying the mechanical properties of the expanded tunnels is of great significance for guiding their safe construction. Through model testing and numerical simulation, the mechanical properties of a double-arch tunnel constructed through the expansion of the middle pilot heading from an existing single-tube tunnel were studied. The variation characteristics of the surface subsidence, surrounding rock stress, and stress and strain of the middle partition wall and lining during the tunnel reconstruction and expansion were investigated. The mechanism for transferring stress and strain between the left and right tunnel tubes was studied by a numerical simulation method. The results showed that the surface subsidence caused by the excavation of the left (i.e., the subsequent) tunnel tube was larger, and the maximum surface subsidence occurred at the right (i.e., the first) tunnel tube. The surrounding rock on the middle wall was the sensitive part of the tunnel excavation, the stress of the surrounding rock at the left spandrel of the right tunnel tube fluctuated and exhibited the most complex variation, and the stress of the surrounding rock at the right spandrel of the left tunnel tube exhibited the largest variation. The excavation of the left tunnel tube had a great influence on the forces of the middle partition wall and the lining structure of the right tunnel tube, the middle partition wall was subjected to eccentric compression towards the left tunnel tube, and the stress at the left spandrel under the initial support of the right tunnel tube exhibited complex variations. The excavation of the left and right tunnel tubes had a great influence on the stability of the surrounding rock, as well as on the force-induced deformation of the middle partition wall and the support structure, within the width of the single tunnel tube span behind the tunnel working face. Due to the different construction sequences, the stress and strain at the symmetric measurement points of the middle partition wall, as well as the left and right tunnel support structures, were very different.

ACSR Strands Stress Numerical Simulation

2012 ◽  
Vol 256-259 ◽  
pp. 710-713
Author(s):  
Li Qin ◽  
Jun Kuo Li ◽  
Qiang Fu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Principal Part ◽  
Concentration Level ◽  
Structural Characteristics ◽  
Stress And Strain ◽  
Electricity Power ◽  
Distribution Of Stress

As an important carrier of electricity power, ACSR is a principal part of power system and is directly related to the transmission line reliability and safety. ACSR strands stress analysis is the foundation of studying ACSR mechanical properties. In this paper, finite element method is used to analysis the Acsr strands stress. The structural characteristics of Acsr is considered and the complete Acsr model is created by ansys to simulate the distribution of stress and strain under appropriate boundary conditions. The Conclusions are drawn that both the state of strands stress and the stress concentration level are related with its structural properties. The strands of out layers bears more stress and firstly comes into plastic strain. The results of the research is helpful to the further study of ACSR strength and conductor fatigue life.

scholarly journals Experimental Investigations of the Stress and Strain State of Continuous Reinforced Concrete Beams Under the Action of Low-Cyclic Repetitive and Alternating Loads

2018 ◽  
Vol 7 (3.2) ◽  
pp. 236
Author(s):  
Grigoriy Masiuk ◽  
Oleksandr Yushchuk ◽  
Andrii Paschenko
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Reinforced Concrete Beams ◽  
Experimental Investigations ◽  
Stress And Strain ◽  
Static Loads

The article is devoted to the experimental studies of the stress and strain state of the two-pass reinforced concrete beams under the influence of low-cyclic repeated and alternating loads. Based on the results of experimental studies, the effect of low-cyclic repeated and alternating loads on the change of the stress and strain state of continuous reinforced concrete beams has been established. In the course of testing the sample, it was found that the stress and strain state of the beams under the action of the above mentioned loads is significantly different from the stress and strain state of the beams under the action of nonalternating static loads, namely, the decrease of the bearing capacity, the increase of the deflections and the width of the cracking. All this is due to the change in the physical and mechanical properties of concrete in response to the above-mentioned loads on experimental.  

Reinforcement of Structures with Composite Materials

2019 ◽  
Vol 974 ◽  
pp. 535-541
Author(s):  
Galina M. Kravchenko ◽  
Elena V. Trufanova ◽  
Artem S. Osadchiy ◽  
Alina Sazonova
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Dynamic Characteristics ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
The Finite Element Method ◽  
New Materials

The aim of the work is to study the ways to strengthen the elements of the parametric architecture object framework based on the use of the new materials. The problem of strengthening the elements of the building frame is particularly relevant in connection with the development of the parametric architecture. Unlike the traditional methods of regulation and amplification, composite materials allow to change the stress-strain state and improve the dynamic characteristics of the parametric architecture object without increasing its own structures weight. The studies were performed using numerical simulation by the finite element method. Recommendations are given on the use of the physical and mechanical properties of the composite materials when strengthening the building framework.

scholarly journals GEOMECHANICAL MODELING IN MINING AT THE ELGINSKY DEPOSIT

2020 ◽  
Vol 2 ◽  
pp. 117-128
Author(s):  
Natalya A. Nemova ◽  
Vladimir L. Gavrilov
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Rock Mass ◽  
Strain State ◽  
Open Pit ◽  
Coal Deposit ◽  
Digital Models ◽  
Stress Strain ◽  
General Stress ◽  
Stress Strain State

Using the Elginsky coal deposit as an example, the relevance of building digital models of geological objects to control the geomechanical condition of open-pit walls is shown. Physico-mechanical properties of overburden rocks are given. The results of numerical simulation of stress-strain state of the rock mass are presented. The directions of general stress displacements and zones of maximum displacements of the open-pit wall are determined and the maps of their distribution are compiled. It is shown that lower benches are more susceptible to tension.

Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

Strain, Stress, and Magnetic Surfaceanisotropy of Epitaxial FE(110)/MO (110) Multilayers

1993 ◽  
Vol 317 ◽  
Author(s):  
R.M. Osgood ◽  
B.M. Clemens ◽  
R.L. White ◽  
S. Brennan
Keyword(s):  
Strain State ◽  
Single Layer ◽  
Grazing Incidence ◽  
Magnetic Surface ◽  
Stress And Strain ◽  
Surface Anisotropy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plane Direction ◽  
Strain Stress

ABSTRACTGrazing incidence and asymmetric X-ray diffraction were used to measure the stress and strain state of Fe(110)/Mo(110) Multilayers. The highest stress in the Fe constituent of the multilayer was along the [110] in-plane direction and was due to interaction with the substrate. The Magnetic anisotropy of the Fe Multilayer constituent was measured and the magnetic surface anisotropy, which favored in-plane [001] magnetization, was deduced. In contrast, the magnetic surface anisotropy of a single layer of Fe on W preferred in-plane [110] magnetization, in agreement with the Néel Model.

Tanning Chemicals’ Influence in Leather Tensile and Tear Strength Review

2020 ◽  
Vol 115 (11) ◽  
pp. 409-412
Author(s):  
Ricardo Tournier
Keyword(s):  
Mechanical Properties ◽  
Collagen Fibers ◽  
Current Paper ◽  
Review Of The Literature ◽  
Tear Strength ◽  
Technical Community ◽  
Tanning Process ◽  
The Impact

For over 100 years of tanning research, it is still arguable whether tanning chemicals weaken, strengthen or have an effect on the skin's original collagen fibers. The current paper is a review of the literature regarding the impact of the tanning process on the mechanical properties of leather specifically, tensile and tear strength, that raises several questions about this topic. A call is made for the scientific and technical community to address these questions

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