Load Capacity of an Internal Slab-Column Connection depending on the Geometric Parameters of the Reinforcement

2014 ◽  
Vol 969 ◽  
pp. 234-240 ◽  
Author(s):  
Barbara Wieczorek
Keyword(s):  
Laboratory Tests ◽  
Load Capacity ◽  
Geometric Parameters ◽  
Simplified Model

Literature deals with a score of catastrophes of slab-column structures, where the absence of adequately constructed reinforcement resulted in an absolute destruction of the construction. This problem is not dealt with either in the Polish Standards, nor in the Eurocodes. Some suggestions concerning the prevention of such situations are to be found merely in CSA A23.3-04. Instructions concerning such a structure are also contained in ACI 318. The paper presents the results of laboratory tests performed on a simplified model of a slab-column connection. The aim of investigations was to find out at which value of the load the destruction of such a connection occurs due to a rupture of the bars above the column. In respective models the reinforcement passing above the column consisted of bars with a diameter of ø8 mm, ø12 mm or ø16 mm. The obtained results of laboratory tests and calculations permitted to determine the relations between the exerted load and the displacement of the column in time and also to determine the values of the force at which the rupture of the bars above the column had taken place.

scholarly journals 15 kVA Three-Phase Low-Voltage SOP Prototype Laboratory Tests Results

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3895
Author(s):  
Thomas Pidancier ◽  
Mokhtar Bozorg ◽  
Dominique Roggo ◽  
Patrick Favre-Perrod ◽  
Mauro Carpita
Keyword(s):  
Laboratory Tests ◽  
Low Voltage ◽  
Load Capacity ◽  
Full Scale ◽  
Voltage Profile ◽  
Laboratory Environment ◽  
Three Phase ◽  
Design And Manufacturing ◽  
Converter Design ◽  
Open Point

In this paper, a 15 kVA soft open point converter is presented. The converter design and manufacturing have been presented in previous papers. The aim of this paper was to show the results of the devices in a full-scale laboratory environment, Gridlab, made of four distribution LV feeders, each rated 40 A. The tests demonstrated the good dynamics of the SOP control and its usefulness in performing a suitable PQ control. They also showed an improvement in the voltage profile and in the load capacity of the overall network. In the final part of the paper, the feedback earned during the development and the test of this first prototype are presented. This feedback will benefit the team for the design of a new improved 50 kVA version.

Theoretic-Strength Concept of a Model Describing the Destruction of the Corner Part of a Slab-Column Structure

2015 ◽  
Vol 240 ◽  
pp. 225-231 ◽  
Author(s):  
Mirosław Wieczorek
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Laboratory Tests ◽  
Concrete Slab ◽  
Load Capacity ◽  
Limit Load ◽  
Traditional Theory ◽  
Load Step ◽  
Reinforced Concrete Slab ◽  
Column Structure

The paper presents a proposed theoretical-strength destruction model of the corner of a slab-column structure at 1:2 scale. The theoretical destruction model was developed on the basis of laboratory tests of a reinforced concrete slab with the dimensions 4000×4000×100 mm. The assumptions of the proposed theoretical model were based on a traditional theory of behaviour of reinforced concrete constructions. The method for calculating the strength of reinforced concrete sections is based on interaction graphs of the load capacity NRd, MRd,x and MRd,y. The calculation method takes into account the influence of changes in the shape of the cross-section of the analysed element on its limit load capacity in every load step.

scholarly journals Influence of boundary conditions in FEM model on structural behaviour of thin-walled steel beams strengthened by CFRP tapes

2020 ◽  
Vol 19 (2) ◽  
pp. 073-086
Author(s):  
Katarzyna Rzeszut ◽  
Ilona Szewczak ◽  
Patryk Rozylo
Keyword(s):  
Boundary Conditions ◽  
Laboratory Tests ◽  
Numerical Models ◽  
Load Capacity ◽  
Steel Beams ◽  
Structural Behaviour ◽  
Fem Model ◽  
Mesh Density ◽  
Newton Raphson ◽  
Thin Walled

The main aim of the study is verification and validation of FEM numerical model of beams made of thin-walled steel profiles retrofitted by CFRP tapes Sika CarboDur S. Validation is are carried out based on own laboratory tests conducted on “Blachy Pruszyński” S-type beams. The CFRP tape are bonded to the beam at compressed or tensioned flange. The most important part of this study is focused on investigation of boundary conditions influence in FEM model developed in Abaqus program. Moreover the numerical models are also tested in terms of different mesh density and types of finite elements. Numerical analyses are carried out using Newton-Raphson iterative method to solve non-linear equilibrium equation. In the paper special attention is paid to the evaluation of the possibility to increase the load capacity of the beams by appropriate localisation of CFRP tape.

scholarly journals Influence of Corrugated Web Geometry on Mechanical Properties of I-beam: Laboratory Tests

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 277
Author(s):  
Marcin Górecki ◽  
Krzysztof Śledziewski
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Failure Modes ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Web Geometry ◽  
Four Point Bending ◽  
Corrugated Webs ◽  
Corrugated Web

This paper presents the results of experimental investigations performed on beams with corrugated webs. The aim of the research was to determine the effect of the geometric parameters of the sinusoidal web on the behavior of I-beams subjected to four-point bending. Special attention was paid to the effects of web thickness and wave geometry on the deflection of beams. The obtained failure modes of particular test samples are presented. Reference has also been made to the determined standard load capacities based on Annex D of the EC3 standard. In order to compare the performance of beams with corrugated webs, the results for beams with flat webs of the same thickness of web sheets are also presented.

scholarly journals Non-Linear Analysis of an RC Beam Without Shear Reinforcement with a Sensitivity Study of the Material Properties of Concrete

2020 ◽  
Vol 28 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Oldrich Sucharda ◽  
Pavlina Mateckova ◽  
Vlastimil Bilek
Keyword(s):  
Detailed Analysis ◽  
Laboratory Tests ◽  
Load Capacity ◽  
Stochastic Modelling ◽  
Reinforced Concrete Beam ◽  
Sensitivity Study ◽  
Linear Analysis ◽  
Shear Reinforcement ◽  
General Behaviour ◽  
Non Linear

AbstractA detailed analysis of concrete structures requires knowledge of the mechanical properties of the materials used. In the case of a non-linear analysis, the scope of the information needed is even greater. In particular, the tensile strength and fracture-mechanical parameters are required for the concrete. Prospective approaches that could increase the informative value of detailed analyses include the use of stochastic modelling. It particularly enables the definition of the effects of individual input parameters on the load capacity, failure mode, and general behaviour of the structure. The presented paper aims at a detailed analysis of a reinforced-concrete beam without shear reinforcement, which is based on a complex set of laboratory tests and non-linear analyses with a sensitivity study. The laboratory program includes different types of laboratory tests. Selected and missing material parameters of the concrete are calculated according to recommendations in scientific papers and the valid standards. The results are compared and discussed.

Experimental Tests of the Load-Bearing Capacity of the Bottom Reinforcement Bars Passing over the Column

2016 ◽  
Vol 837 ◽  
pp. 146-151 ◽  
Author(s):  
Barbara Wieczorek
Keyword(s):  
Bearing Capacity ◽  
Laboratory Tests ◽  
Experimental Tests ◽  
Simplified Model ◽  
Load Bearing Capacity ◽  
Load Bearing

In the paper the results of laboratory tests performed on a simplified model of a slab-column connection were presented. The aim of investigations was to find out at which value of the load the destruction of such a connection occurs due to a rupture of the bars above the column. In respective models the column was situated axially or eccentrically with respect to span of bars. In each case the reinforcement passing above the column consisted of bars with a diameter of ø8 mm, ø12 mm or ø16 mm. The obtained results of laboratory tests and calculations permitted to determine the relations between the exerted load and the displacement of the column in time and also were compared with the guidelines contained in the standards CSA A23.3 and ACI 352R. Based on the results, the reduction of the load bearing capacity of the reinforcement bars due to bending was determined.

scholarly journals Estimating the Unit Weight of Local Organic Soils from Laboratory Tests Using Artificial Neural Networks

2020 ◽  
Vol 10 (7) ◽  
pp. 2261
Author(s):  
Grzegorz Straż ◽  
Artur Borowiec
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Laboratory Tests ◽  
Load Capacity ◽  
Unit Weight ◽  
Organic Soils ◽  
High Quality Research ◽  
Difficult Time ◽  
Interpretation Criteria ◽  
Artificial Neural

The estimation of the unit weight of soil is carried out using laboratory methods; however, it requires high-quality research material in the form of samples with undisturbed structures, the acquisition of which, especially in the case of organic soils, is extremely difficult, time-consuming and expensive. This paper presents a proposal to use artificial neural networks to estimate the unit weight of local organic soils as leading parameters in the process of checking the load capacity of subsoil, under a direct foundation in drained conditions, in accordance with current standards guidelines. The initial recognition of the subsoil, and the locating of organic soils at the Theological and Pastoral Institute in Rzeszow, was carried out using a mechanical cone penetration test (CPTM), using various interpretation criteria, and then, material for laboratory tests was obtained. The analysis of the usefulness of the artificial intelligence method, in this case, was based on data from laboratory tests. Standard multi-layer backpropagation networks were used to predict the soil unit weight based on two leading variables: the organic content LOIT and the natural water content w. The applied neural model provided reliable prediction results, comparable to the standard regression methods.

scholarly journals Determination of the heating pile numerical model parameters based on the laboratory strength tests of clay at low temperatures

2018 ◽  
Vol 50 (2) ◽  
pp. 159-169
Author(s):  
Bartosz Piotrowicz ◽  
Małgorzata Jastrzębska ◽  
Marian Łupieżowiec
Keyword(s):  
Low Temperatures ◽  
Laboratory Tests ◽  
Load Capacity ◽  
Model Parameters ◽  
Mechanical Parameters ◽  
Temperature Changes ◽  
Negative Effect ◽  
Significant Temperature ◽  
Freezing Liquid

Abstract Heating piles combine the function of the foundation and the heat source. They acquire heat from the ground through in built the installation. Inside the installation is non-freezing liquid at low temperature. In connection with the above, piles and the surrounding soil are exposed to significant temperature changes. As a result of these changes, the mechanical parameters of the soil and the behavior of the pile and soil contact surface were changed. This affects directly the load capacity of the heating piles. To describe this effect, laboratory tests were carried out to determine the thermal and mechanical parameters of the soil at low temperatures. The results from laboratory tests were applied as material parameters in the Z_Soil program. Based on the analysis using the finite element method, it was found that there is an negative effect on the friction on the surface of pile associated with the heat transfer between the soil and the pile.

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