scholarly journals Evaluation of bearing capacity of a beam on an elastic foundation using the methods of the theory of limiting balance

2021 ◽  
Vol 274 ◽  
pp. 03029
Author(s):  
Vasil Nizameev ◽  
Fanzil Basharov ◽  
Luiza Nizameeva
Keyword(s):  
Bearing Capacity ◽  
Plastic Hinge ◽  
Limiting State ◽  
Numerical Studies ◽  
Complete Destruction ◽  
Limiting Load ◽  
Adopted Model ◽  
Elastoplastic Beam ◽  
Analytical Expressions ◽  
Limiting Values

The analytical expressions and graphs for determining a limiting load have been obtained using the methods of the theory of limiting balance. The processes of strain of the beams after formation of a plastic hinge until their complete destruction have been investigated. The dependences of a bearing capacity of the beam on its parameters and characteristics of the foundation soils have been obtained. The regularities of formation of plastic hinges have been revealed depending on a place of application of the load. The limiting values of the load have been calculated analytically, and the forms of deformation of the beam have been established at the time of the appearance of the first plastic strains and in the limiting state. The comparative analysis of the research results of the adopted model with the numerical studies of the elastoplastic beam has been carried out.

Parameter Analysis on Bearing Capacity of Concrete-Filled Square Steel Tubular Column to Steel-Encased Concrete Composite Beam Joint with through Diaphragm

2014 ◽  
Vol 1065-1069 ◽  
pp. 1203-1207
Author(s):  
Yan Lin ◽  
Xue Jun Zhou ◽  
Yu Chen Liu ◽  
Wen Qing Kong
Keyword(s):  
Bearing Capacity ◽  
Composite Beam ◽  
Plastic Hinge ◽  
Nonlinear Finite Element ◽  
Parameter Analysis ◽  
Longitudinal Reinforcement ◽  
Element Analysis ◽  
Obvious Effect ◽  
Axial Compression Ratio ◽  
New Type

A new type of concrete-filled square steel tubular column to steel-encased concrete composite beam joint is proposed. In order to study the influences of parameters on bearing capacity for the joint formed plastic hinge in the beam end, nonlinear finite element analysis under monotonic loading is conducted by software ANSYS. The results show that axial compression ratio has little influence on joint bearing capacity, and with the increasing of it, the bearing capacity is enhanced slightly. The height of U-shape steel has a significant impact on joint bearing capacity, and with the rise of it, the bearing capacity is enhanced obviously. The thickness of U-shape steel has a comparatively obvious effect on joint bearing capacity with certain limits, and with the growth of it, the bearing capacity of the joint is also grown observably. The diameter of longitudinal reinforcement in the flange slab of beam has some effects on joint bearing capacity, and with the improvement of diameter, the bearing capacity is achieved.

Strengthening of Reinforced Concrete Beams by Carbon Fiber Composites

2018 ◽  
Vol 931 ◽  
pp. 379-384
Author(s):  
Yuri V. Ivanov ◽  
Yuri F. Rogatnev ◽  
Igor I. Ushakov
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Carbon Fiber Composites ◽  
Limiting State ◽  
Reinforced Plastics ◽  
Reinforced Beams ◽  
The Given

The paper considers the results of the experimental study of the reinforced concrete beams strengthened by carbon fiber reinforced plastics (the CFRP). Eight reinforced concrete beams of the 80x160 mm section and 1500 mm designed span have been manufactured and tested. The influence of the number of the CFRP layers (strengthening power) on bearing capacity and rigidity under the static loading of beams in the thirds of the span has been studied. The results obtained indicate the increase in bearing capacity of the reinforced beams from 24% up to 55% and the increase in rigidity by 45% for the commonly adopted limiting state, i.e. achieving ultimate deformations in concrete of the compressed zone). The paper underlines the need for using anchor devices in the form of U-shaped binders to ensure the efficiency of the given method of strengthening.

RESISTANCE OF THE PRECAST - CAST-IN-SITU REINFORCED CONCRETE FRAMES OF CIVIL BUILDINGS UNDER SPECIAL EMERGENCY IMPACT

2021 ◽  
Vol 96 (4) ◽  
pp. 45-55
Author(s):  
P.A. KORENKOV ◽  
◽  
S.S. FEDOROV ◽  
Keyword(s):  
Thermal Protection ◽  
Progressive Collapse ◽  
Structural System ◽  
Concrete Frames ◽  
Limiting State ◽  
Space Planning ◽  
Numerical Studies ◽  
Design Loads ◽  
Multi Level

The paper obtained and analyzed the results of a numerical analysis of the survivability of a new industrial structural system of residential and public buildings that meets modern requirements for protection against progressive collapse, improved space-planning, architectural and thermal protection solutions. The presence of a significant number of enterprises with technological lines for the production of structures for large-panel housing construction and their market share, combined with a number of disadvantages of the applied technical and space-planning solutions, indicates the need to modernize these enterprises in order to produce products that meet modern requirements. The purpose of this study was to qualitatively and quantitatively study the parameters of the stress-strain state of the industrial structural system of civil buildings proposed by the authors with increased resistance to progressive collapse, the production of which would not require expensive modernization of the construction industry enterprises. On the basis of multi-level design schemes, an algorithm for calculating such a system for a special emergency effect is proposed. Numerical studies have established the compliance of the developed structural system with the requirements of a special limiting state under design loads and emergency effects caused by the sudden removal of a vertical load-bearing element.

Ensuring the durability of the working bodies of tillage machines

2018 ◽  
Author(s):  
Владимир Новиков ◽  
Vladimir Novikov
Keyword(s):  
Wear Resistance ◽  
Minimum Cost ◽  
Limiting State ◽  
Methods Of Calculation ◽  
Deformation And Fracture ◽  
Technical Ceramics ◽  
Steel Grades ◽  
Working Bodies ◽  
Production And Operation ◽  
Analytical Expressions

The book sets out the criteria for the limiting state of the working bodies of tillage machines as a result of wear, analytical expressions for determining their durability based on the wear resistance of the materials from which they are made, and the wear ability of the soil. The results of studies of the relative wear resistance of steels, surfacing materials, technical ceramics. Recommendations on the choice of steel grades for the production of working bodies are given. Methods of calculation of strength of working bodies (on the example of ploughshare) from deformation and fracture are presented. Various technologies of strengthening of working bodies and results of their tests are given. The example of justification materials, technologies and designs during the development of the working bodies (on the example of the blade of the plow) for maximum durability and minimum cost in their manufacture. The book is intended for engineers and technicians involved in the production and operation of agricultural machinery. It can also be useful for students of agricultural universities studying in the direction of "Agroengineering".

scholarly journals METHODS OF THERMAL STRENGTHENING OF SOILS

2021 ◽  
Vol 112 ◽  
pp. 20-25
Author(s):  
K.G. Kondrashin ◽  
◽  
V.N. Pilipenko ◽  
Keyword(s):  
Bearing Capacity ◽  
Thermal Methods ◽  
Complete Destruction ◽  
Loess Soils

In the practice of construction on loess and loess soils, there are numerous cases of significant and uneven settlement of the foundations of buildings and structures due to the ability of subsidence soils to significantly decrease in volume (compaction) when moistened, which causes dangerous and often emergency deformations, and sometimes complete destruction of these structures. Thermal methods of strengthening loess soils make it possible to completely eliminate their subsidence properties and at the same time in-crease the bearing capacity of soils to a depth of 10–15 m.

scholarly journals The Bearing Capacity Calculation Method of Cracked Reinforced Concrete Column at High Temperature

2017 ◽  
Vol 11 (1) ◽  
pp. 887-895
Author(s):  
Yuzhuo Wang ◽  
Jian Song ◽  
Cancan Wang ◽  
Chuanguo Fu
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Bearing Capacity ◽  
Element Model ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Numerical Studies ◽  
Different Types ◽  
Capacity Calculation ◽  
Parametric Studies

Introduction: This paper presents results from a set of numerical studies on the cracked reinforced concrete column at high temperature. Methods: The macroscopic finite element model used in the accounts analysis for high temperature properties of constitutive materials. The validity of the model is established by comparing the predictions from numerical analysis with the data measured in the fire test. Result and Conclusion: Data from the test indicated that the temperature of rebar in column with cracks is 57% ~ 130% higher than that without cracks under the same condition, and different types of crack had significant influence on the bearing capacity of column. These results from parametric studies were utilized to propose ultimate bearing capacity of cracked reinforced concrete column.

Improving the Methodology for Calculating the Bearing Capacity of Eccentrically Compressed Reinforced Concrete Elements Based on the Use of the Refined Curvilinear Deformation Diagrams of Concrete and Reinforcement

2019 ◽  
Vol 974 ◽  
pp. 570-576
Author(s):  
Alexander I. Nikulin ◽  
Al-Khawaf Ali Fadhil Qasim
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Linear Equations ◽  
Resistance Force ◽  
Deformation Model ◽  
Concrete Element ◽  
Element Determination ◽  
Numerical Studies ◽  
Concrete Elements ◽  
Deformation Diagrams

The article proposes a new approach to improving the methodology for calculating the bearing capacity of the eccentrically compressed reinforced concrete elements for cases of their loading with large eccentricities. The basis of this technique is considered as a modified version of the deformation model for the reinforced concrete resistance force. The main feature of this model is the energy approach to transforming the reference diagrams of compression and concrete tension into the diagrams of non-uniform deformation, corresponding to the stress-strain state of the compressed and stretched zones of concrete in the cross section of the eccentrically compressed reinforced concrete structures. This way there is no falling branch in the concrete diagrams obtained by this method. A calculation diagram of the steel reinforcement deformation with a physical yield point was taken as a partial function, consisting of one linear and two non-linear equations. The proposed method also shows the possibility of taking into account the greatest curvature of an eccentrically compressed reinforced concrete element in the plane of its loading. The article presents all the necessary dependencies allowing the theoretical value of the carrying capacity of an eccentrically compressed reinforced concrete element determination. The results of the numerical studies performed using the design software developed by the authors for the personal computer are given.

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