Evaluation of Load Bearing Capacity of Foundations with Different Vertical Cross-sectional Shapes

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.

Download Full-text

LOAD-BEARING CAPACITY ANALYSIS FOR STRUCTURAL COLD-FORMED MEMBERS SUBJECTED TO CENTRAL COMPRESSION

Bulletin of Odessa State Academy of Civil Engennering and Architecture ◽

10.31650/2415-377x-2021-85-28-42 ◽

2021 ◽

pp. 28-42

Author(s):

А.V. Perelmuter ◽

◽

V.V. Yurchenko ◽

Keyword(s):

Bearing Capacity ◽

Local Buckling ◽

Structural Members ◽

Design Code ◽

Distortional Buckling ◽

Load Bearing Capacity ◽

Cross Sectional ◽

Load Bearing ◽

Composite Section ◽

Flexural Torsional Buckling

Abstract. The main purpose of the research was a deep analysis and verification of the consistency and completeness of the design code relating to calculation of load-bearing structural members made from cold-formed profiles. The work has been done in close connection with the implementation on the territory of Ukraine of this design code. The article has discussed and investigated the load-bearing capacity of structural members made of cold-formed profiles subjected to the action of central compression. A system of constraints has been presented, in which the strength and buckling constraints for thin-walled cold-formed column members are formulated, taking into account their possible post-buckling behavior, namely, the ability to resist external loads and effects even after the occurrence of the local buckling and/or distortional buckling phenomenon. The performed load-bearing capacity investigation has shown that for the mono-symmetric cold-formed profiles, the flexural-torsional buckling is determinative. For such cold-formed profiles, the effect of the overall dimensions ratio (flange width to web height) on the load-bearing capacity of cold-formed profiles has been estimated. It has been shown that for the same cross-sectional area the load-bearing capacity of a column structural member made from cold-formed profile and subjected to axial compression can be significantly increased by assigning an optimal ratio of flange width to web height. The paper also has presented the results of the load-bearing capacities for the structural cold-formed members subjected to central compression, calculated according to the design standard DSTU-N B EN 1993-1-3: 2012 and according to the design code DBN V.2.6-198: 2014. It has been shown that in some cases the difference in the assessment of the load-bearing capacity for such structural cold-formed members reached 25%. A comparison of the load-bearing capacities for the action of the central compression has been made for structural cold-formed members made from a C-shaped profile and with a composite section of two C-shaped profiles. It has been shown that the load-bearing capacity of the structural cold-formed member of the composite section exceeds the load-bearing capacity of the member with single C-shaped profile by more than 3 times, while cross-section areas of these structural members differ only doubly.

Download Full-text

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

Proceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018 ◽

10.4995/asccs2018.2018.7197 ◽

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.

Download Full-text

The Effect of Service Installations on Structural Integrity of Slabs in Buildings

Tanzania Journal of Engineering and Technology ◽

10.52339/tjet.v33i1.450 ◽

2010 ◽

Vol 33 (1) ◽

pp. 18-28

Author(s):

Ladslaus Lwambuka

Keyword(s):

Reinforced Concrete ◽

Bearing Capacity ◽

Structural Design ◽

Design Guidelines ◽

Cross Sectional Area ◽

Sectional Area ◽

Structural Element ◽

Load Bearing Capacity ◽

Cross Sectional ◽

Load Bearing

In building construction industry service installations, usually housed in conduit pipes, are commonly mounted inside reinforced concrete structural elements. This practice is adopted to attain aesthetical outlook at both interior and exterior surfaces of the buildings. Depending on the extent of service installations, the cross sectional area of the load bearing structural member is substantially reduced. However, the current structural design guidelines have no provision to accommodate the extent to which the existence of conduit pipes impairs the load bearing capacity of the structural element though reduced cross sectional area. This study has attempted to address this gap in structural design ofbuildings; it involves assessing the current design practice of considering a structural element as a full solid body and comparing its ultimate load bearing capacity with the ones containing the conduit pipes. The study findings are based on test results from laboratory experiments on reinforced concrete slab models with varying intensity of conduit pipeinstallations as commonly practiced on construction sites. Recommendations are put forth when and how to consider the reduced load bearing capacity through the existence of service installations as part of structural engineering designs.

Download Full-text

Investigation of the load-bearing behavior of composite joints in cross-section supplements for concrete structures

10.2749/ghent.2021.1872 ◽

2021 ◽

Author(s):

Christian Knorrek ◽

Sven Bosbach ◽

Josef Hegger

Keyword(s):

Bearing Capacity ◽

Structural Concrete ◽

Load Bearing Capacity ◽

Research Project ◽

Cross Sectional ◽

Ongoing Research ◽

Load Bearing ◽

Existing Structures ◽

Composite Joint ◽

Bearing Behavior

<p>The strengthening with cross-sectional supplements made of reinforced concrete is already of great importance in building, bridge, and industrial constructions and will be further developed in the future because of the increasing demands on existing structures [1]- [3].</p><p>As part of an ongoing research project at the Institute of Structural Concrete at RWTH Aachen University, funded by the German Federation of Industrial Research Associations (AiF), a correlation between the method of surface treatment of the old concrete, the measured roughness, the type of concrete supplementation, and the load-bearing capacity of the composite joint has to be derived by means of new systematic test series. As a result, a database, and a possible practical guide on the load-bearing capacity of different combinations of old concretes, surface treatments, supplementary concrete layers, and bonding conditions will be developed. This paper will present the initial findings from this research project.</p>

Download Full-text

BEARING CAPACITY OF SINGLE-ANGLE COMPRESSION MEMBER: EXPERIMENTAL AND NUMERICAL INVESTIGATION

Stavební obzor - Civil Engineering Journal ◽

10.14311/cej.2021.01.0025 ◽

2021 ◽

Vol 30 (1) ◽

Author(s):

Javad Majrouhi Sardroud ◽

Mohammad Hossein Zaghian

Keyword(s):

Bearing Capacity ◽

Load Bearing Capacity ◽

Cross Sectional ◽

Load Bearing ◽

Linear Behavior ◽

Angle Section ◽

Support Conditions ◽

Almost All ◽

Abaqus Software ◽

Compression Member

This study was conducted to investigate the load-bearing capacity of a single angle column under various loading conditions to determine the loading condition offering the highest load- bearing capacity. In all cases, the load is transferred through one leg (or two legs) of the angle which has a smaller cross-sectional area compared to the total area of the angle profile. The main objective of this study is to develop almost all of the possible support conditions for the single angle section and carry out laboratory tests on the chosen specimens to determine the most suitable one. Also, there are some finite element investigations done using ABAQUS software to find out the maximum forces in which all the elements of the structures remain their linear behavior and the stress spots concentration. Based on the obtained results, it is possible to increase the axial critical load of a single angle by using the connections at the main axis of the section.

Download Full-text