scholarly journals From Material Level to Structural Use of Mineral-Based Composites—An Overview

2010 ◽  
Vol 2010 ◽  
pp. 1-19 ◽  
Author(s):  
Katalin Orosz ◽  
Thomas Blanksvärd ◽  
Björn Täljsten ◽  
Gregor Fischer
Keyword(s):  
Composite Material ◽  
Bearing Capacity ◽  
Mechanical Behaviour ◽  
Material Properties ◽  
Cementitious Composites ◽  
Structural Elements ◽  
Load Bearing Capacity ◽  
Comprehensive Description ◽  
Load Bearing ◽  
Further Development

This paper surveys different material combinations and applications in the field of mineral-based strengthening of concrete structures. Focus is placed on mechanical behaviour on material and component levels in different cementitious composites; with the intention of systematically maping the applicable materials and material combinations for mineral-based strengthening. A comprehensive description of a particular strengthening system developed in Sweden and Denmark, denominated as Mineral-based Composites (MBCs), together with tests from composite material properties to structural elements is given. From tests and survey it can be concluded that the use of mineral-based strengthening system can be effectively used to increase the load bearing capacity of the strengthened structure. The paper concludes with suggestions on further development in the field of mineral-based strengthening.

scholarly journals LOAD-BEARING CAPACITY ANALYSIS OF BUILDING PARTITIONS OF THE COLD STORAGE CHAMBERS

2019 ◽  
Vol 81 (2) ◽  
pp. 240-248
Author(s):  
R. Chmielewski ◽  
L. Kruszka ◽  
L. Muzolf
Keyword(s):  
Bearing Capacity ◽  
Cold Storage ◽  
Limit State ◽  
Technical Condition ◽  
Capacity Analysis ◽  
Structural Elements ◽  
Current Load ◽  
Structural Element ◽  
Load Bearing Capacity ◽  
Load Bearing

The paper presents problems related to the load-bearing capacity analysis of the building partitions of the cold storage facility. The subject of the case study are two different buildings built in the early fifties of the last century. Despite the similar cubature and the construction period, the structures of these buildings are different. The analysed cold store in Warsaw (Poland) is a steel and brick structure, while the second example concerns a reinforced concrete slab-pillar structure located in Wloclawek (Poland). In both cases, the issue related to the assessment of the current technical condition of the structural elements, including the safety of the load-bearing structure and the safety of its use was considered. Moreover, the permissible load for inter-storey slabs in both cases was determined. In order to properly determine the current load-bearing capacity of inter-story slabs, the archival technical and operational documentation of buildings was firstly analysed. Their technical condition was also taken into account in the assessment process. In-situ inspections of both buildings had been carried out. This allowed the determination of the scope of necessary tests and the selection of test and check points for each structural element. Such actions allowed to identify cross-sections of the structural elements and the parameters of built-in materials. The performed diagnostics also allowed to properly determine the technical condition of each structural element, the degree of degradation of the structure and to correctly determine its current load-bearing capacity while simultaneously satisfying both limit states - the Ultimate Limit State (ULS) and the Serviceability Limit State (SLS).

Nonlinear structural analysis of a masonry wall

2021 ◽  
Author(s):  
Guangli Du ◽  
Thomas Cornelius ◽  
Joergen Nielsen ◽  
Lars Zenke Hansen
Keyword(s):  
Bearing Capacity ◽  
Material Properties ◽  
Slenderness Ratio ◽  
Masonry Wall ◽  
Masonry Walls ◽  
Vertical Load ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Support Conditions ◽  
Theoretical Developments

<p>Structural modelling of a masonry wall is challenging due to material properties, eccentricity of the vertical load, slenderness ratio etc. In recent theoretical developments for design of masonry walls, a new “Phi” method to determine the eccentricity is adopted in Eurocode 6. However, the comparisons between this method and the conventional “Ritter” method shows that for certain prerequisites it would result in substantial different load-bearing capacity. Hence, in order to investigate how support conditions influence the load bearing capacity of the wall, this study performs a nonlinear numerical analysis of a wall for several load cases in ABAQUS and the result is verified with an independently developed calculation tool using MATLAB. The results show that the top rotation plays a significant role for the load bearing capacity of the masonry wall supported by slabs at both ends. It is difficult to estimate the eccentricities without a rigorous calculation.</p>

ENGINEERING PROCEDURE FOR EVALUATING THE LOAD-BEARING CAPACITY AND LIFE OF A DEFECTIVE STRUCTURE

2020 ◽  
pp. 36-49
Author(s):  
Aleksey N. SOFINSKIY
Keyword(s):  
Fracture Mechanics ◽  
Bearing Capacity ◽  
Material Properties ◽  
Operating Conditions ◽  
Engineering Practice ◽  
Stress Strain ◽  
Load Bearing Capacity ◽  
Defective Structure ◽  
Load Bearing ◽  
Manufacturing Defects

A piece of rocket and space hardware may consist of tens of thousands of parts. Virtually every as-built piece of hardware has some non-conformances to the design documentation. Manufacturing defects often occur or are discovered during the final stages of the vehicle assembly or pre-launch processing. In such cases, removal of the non-conformance is either impossible or is too difficult and costly. The procedure described in the paper makes it possible to evaluate the degree of impact of a typical defect on the load-bearing capacity, strength, leak integrity, and life of a structure under its operating conditions. Sections of the procedure include description of operations involving non-destructive testing, determining loads on the vehicle and other operating conditions, stress-strain analysis, experimental determination of the material properties, prediction of the crack kinetics from the standpoint of fracture mechanics. The procedure gives a structural analyst an algorithm for solving the complex problem of estimating the service life, which consists of a sequence of specific tasks: developing the finite element model, classifying the defect, constructing the loading block, analyzing stress-strain behavior, predicting the behavior of the initial defect. Introducing the procedure into engineering practice will make it possible to increase validity of the estimate of the load bearing capacity and life, and, therefore, of the reliability and safety of the vehicle operation. Key words: structure, defect, crack, loads, stress condition, material properties, fracture mechanics, strength, leak integrity, life.

scholarly journals Concrete-filled round-ended steel tubular stub columns under concentric and eccentric loads

2018 ◽  
Author(s):  
Ana Piquer Vicent ◽  
David Hernández-Figueirido ◽  
Carmen Ibáñez Usach
Keyword(s):  
Bearing Capacity ◽  
Mechanical Behaviour ◽  
Mechanical Response ◽  
Concrete Strength ◽  
High Strength ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Composite Columns ◽  
Stub Columns

In the past, many works to study the mechanical behaviour of concrete filled steel tubular (CFST) stub columns have been conducted. Some of the applications of these composite columns oblige to meet higher requirements of ductility and load-bearing capacity. Traditionally, circular and rectangular tubes have been employed but recently new cross-sectional shapes of these composite columns are being designed and investigated with the aim of optimizing their mechanical behaviour. In this line, concrete-filled round-ended steel tubular columns (CFRT) have appeared as an alternative. However, the number of experimental programs to characterize their mechanical response is still scarce. In order to contribute to the test results database, in this paper an experimental study of 9 concrete-filled round-ended steel tubular stub columns is presented. All the specimens were designed with the same cross-sectional round-ended shape and have the same dimensions. In this program, both normal and high-strength concrete were employed as infill. During the tests, the columns were subjected to axial compression loads but under different eccentricities. The influence of eccentricity and concrete strength on the ultimate load bearing capacity of the concrete-filled round-ended steel tubular are discussed. Besides, the combined action of both components in this type of concrete-filled tubes as well as the effect of the concrete infill are studied.

scholarly journals Curvilinear steel elements in load-bearing structures of high-rise building spatial frames

2018 ◽  
Vol 33 ◽  
pp. 02028
Author(s):  
Alexander Ibragimov ◽  
Alexander Danilov
Keyword(s):  
Bearing Capacity ◽  
Large Volume ◽  
Structural Elements ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Metal Structures ◽  
High Rise ◽  
Basic Assumptions ◽  
Calculation Results ◽  
Parabolic Arch

The application of curvilinear elements in load-bearing metal structures of high-rise buildings supposes ensuring of their bearing capacity and serviceability. There may exist a great variety of shapes and orientations of such structural elements. In particular, it may be various flat curves of an open or closed oval profile such as circular or parabolic arch or ellipse. The considered approach implies creating vast internal volumes without loss in the load-bearing capacity of the frame. The basic concept makes possible a wide variety of layout and design solutions. The presence of free internal spaces of large volume in "skyscraper" type buildings contributes to resolving a great number of problems, including those of communicative nature. The calculation results confirm the basic assumptions.

scholarly journals ACCOUNTING THE STEEL PROFILE IN THE CALCULATIONS OF THE LOADING CAPABILITY OF STEEL-CONCRETE BEAMS

2019 ◽  
pp. 26-33
Author(s):  
N. Vinogradova
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Structural Elements ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
External Reinforcement ◽  
Thin Walled ◽  
Monolithic Structure

Prefabricated monolithic floors are the best solution in terms of cost and time of work. In addition, due to the lightweight filling blocks included in the prefabricated monolithic structure, the overlap has less weight than the classic monolithic or precast slabs. Within the framework of this article, elements of prefabricated monolithic floors — reinforced concrete T-beams with a steel thin-walled profile, which is used primarily as formwork at the stage of construction and installation works, are calculated. Nevertheless, the calculation of the steel profile as an external reinforcement increases the load-bearing capacity of the beams by 50%. To assess the fact effect of the steel thin-walled profile on the strength characteristics of structural elements, experimental studies are conducted. According to the results of the experiment, it is found that the contribution of the steel thin-walled profile to the bearing capacity of the beams is 15%, while if the profile slip due to anchoring in the supporting zones is reduced, the bearing capacity increases by 50-60% compared to similar beams without a profile

Assessment of the Load-Bearing Capacity of Reinforced Concrete Rack With a Composite Cover of a Constructive Element of Bridge Supports

2021 ◽  
pp. 86-96
Author(s):  
В. А. Шендрик
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Composite Shell ◽  
Structural Elements ◽  
Joint Work ◽  
Load Bearing Capacity ◽  
Concrete Core ◽  
Load Bearing ◽  
Fiberglass Shell ◽  
Bridge Structures

Постановка задачи. Рассматривается задача разработки методики расчета несущей способности гибридных железобетонных стоек, предназначенных для стоечных опор мостовых сооружений с внешними композитными (стеклопластиковыми) оболочками. Результаты. Сформулированы теоретические зависимости для определения напряжений и относительных деформаций конструктивных элементов гибридной стойки в продольном и поперечном направлениях. Разработанные формулы учитывают совместную работу всесторонне сжатого бетонного ядра с анизотропной стеклопластиковой оболочкой, но не учитывают силовое и средовое воздействие непосредственно на композитную оболочку. Выводы. Полученные теоретические зависимости работы элементов гибридной стойки позволяют разработать методику расчета несущей способности гибридных стоек для опор мостовых сооружений. Результаты исследования предлагается применять в расчетах гибридных стоечных опор мостовых сооружений с элементами из композитных материалов. Statement of the problem. The problem of development of a technique of calculation of the load-bearing capacity of the hybrid reinforced concrete racks intended for rack supports of bridge constructions with external composite (fiberglass) covers is explored. Results. Theoretical dependences for identifying the stresses and relative deformations of structural elements of a hybrid rack in the longitudinal and cross directions are formulated. The resulting formulas take into consideration the joint work of a comprehensively compressed concrete core with an anisotropic fiberglass shell, but do not account for the force and environmental effects directly on the composite shell. Conclusions. The resulting theoretical dependences of the operation of the elements of the hybrid rack enable us to develop a method for calculating the load-bearing capacity of hybrid racks for the supports of bridge structures. It is suggested that the results of the research are applied in calculations of hybrid rack supports of bridge constructions with elements from composite materials.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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