scholarly journals METHODS FOR CALCULATING RECTANGULAR SECTION BEAMS MADE OF WOOD AND CONCRETE

2021 ◽  
pp. 1-5
Author(s):  
Ksenia Olegovna Dubrakova ◽  
Viacheslav Aseev ◽  
Aleksey Bulgakov
Keyword(s):  
Comparative Analysis ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Rectangular Cross Section ◽  
Limit State ◽  
Experimental Studies ◽  
Ultimate Limit State ◽  
Numerical Comparison ◽  
Building Structures ◽  
Ultimate Limit

The research aimed to study methods for calculating wood-concrete beams of rectangular cross-section when testing building structures according to the ultimate limit state. The article focuses on the comparison of theoretical methods for calculating structures and considers several methods of fastening the samples of a typical wood-concrete beam. There were obtained experimental data of the ultimate limit state for each sample and carried out a comparative analysis of the most advantageous scheme of fastening the sample parts. The scientific novelty is in the development of an algorithm for calculating composite wood-concrete beams of rectangular cross-sections. As a result, numerical comparison of the values for calculating a typical wood-concrete beam using two of the methods under consideration was given, experimental studies were carried out, as well as a comparative analysis of the obtained theoretical and experimental results.

Innovative Applications of Steel Fibres in Concrete Flange of Composite Beam Subjected to Combined Negative Bending and High Axial Tension

2015 ◽  
Vol 1129 ◽  
pp. 367-374
Author(s):  
Mahesan Bavan ◽  
Shahrizan bin Baharom ◽  
Siti Aminah Osman
Keyword(s):  
Composite Beam ◽  
Failure Modes ◽  
Limit State ◽  
Experimental Studies ◽  
Plain Concrete ◽  
Ultimate Limit State ◽  
Steel Fibres ◽  
Axial Tension ◽  
Negative Bending ◽  
Ultimate Limit

The steel-concrete composite beam has become very popular these days and deterioration of the composite beam and its ultimate limit state are often reported in the subjection of combined negative bending and axial tension. Due to the presence of high axial loads, it was given a guideline in a previous research study by experimental investigation such that the failure modes were reinforcement fracture and shear connection failure in limiting the ultimate limit state of the composite beam subjected to combined negative bending and high axial tension rather than concrete failure. Thus, it is important to study in order to implement the strengthening methods with innovative material applications to overcome this problem. It was assumed that the application of steel fibres in the concrete flange will be an excellent contender owing to its in-service and mechanical properties, which is the hypothesis of this research. In order to evaluate this concept, the finite element (FE) models of a composite beam subjected to negative bending and high axial tension, and steel fibre reinforced concrete (SFRC) slab were developed with non-linear material components and validated with relevant experimental studies. Consequently, the plain concrete flange of composite beam was replaced by SFRC flange and studied the failure behaviour of the composite beam subjected to combined negative bending and high axial tension. It was predicted that an improvement in the ultimate limit state and in initial cracking load due to the postponing the failure modes, which are extensively discussed and suggested as it will be a strengthening method of the concrete flange on the composite beam in such cases.

scholarly journals Automation of the evaluation of bonded and unbonded prestressed concrete beams, according to brazilian and french code specifications

2013 ◽  
Vol 6 (1) ◽  
pp. 13-54
Author(s):  
P. M. Lazzari ◽  
A. Campos Filho ◽  
F. P. S. L. Gastal ◽  
R. A. Barbieri ◽  
R. C. Schwingel
Keyword(s):  
Prestressed Concrete ◽  
Geometric Nonlinearity ◽  
Computational Algorithm ◽  
Concrete Beams ◽  
Limit State ◽  
Ultimate Limit State ◽  
Flexural Members ◽  
Design Procedures ◽  
Planar Frames ◽  
Ultimate Limit

This paper presents a suggestion for the automation of the design procedures of bonded and unbonded prestressed concrete flexural members, according to the Brazilian (NBR 6118:2007) and French (Règles BPEL 91) norm specifications. Prestressing of concrete structures has been increasingly used, mainly due to its building advantages, as well as allowing reducing crack incidence and element dimensions by the use of more resistant materials. Structure is analyzed by a numerical model that employs a hybrid type finite element for planar frames, considering geometric nonlinearity, cyclic loading and composite construction. The computational algorithm implemented considers full, partial and limited prestressing situations, evaluating in each case decompression limit state, limit state of cracking, ultimate limit state and final prestressing state. Finally, two examples comparing design situations according to the Brazilian and French norms are presented.

Study on Deflection of Reinforced Concrete Beam Strengthening with CFRP Cloth

2013 ◽  
Vol 671-674 ◽  
pp. 794-798
Author(s):  
Li Jun Meng ◽  
Jing Zhao ◽  
Yan Jun Zhang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Limit State ◽  
Reinforced Concrete Beam ◽  
Ultimate Limit State ◽  
Elastic Model ◽  
Reinforced Plastics ◽  
Linear Elastic ◽  
Beam Strengthening ◽  
Ultimate Limit

Based on the assumption of plane section and linear elastic model, CFRP (carbon fibre-reinforced plastics) strengthening reinforced concrete beam stiffness and deflection have been analyzed in this paper. It is has been solved the problem of such beam’s deflection and stiffness problem in the serviceability limit state, that is can’t be properly calculated with present method, although bearing capacity for the ultimate limit state to this kind of beam is main design aspect. This paper’s calculation formula can guide the relevant components of the design and has been verified by the four root concrete beam’s test results.

scholarly journals COMPARATIVE ANALYSIS OF COMPOSITE TIMBER-CONCRETE CEILING SYSTEMS

Wood Research ◽  
2021 ◽  
Vol 66 (6) ◽  
pp. 943-954
Author(s):  
KLARA FREUDENBERGER ◽  
JAROSLAV SANDANUS
Keyword(s):  
Comparative Analysis ◽  
Boundary Conditions ◽  
Fire Resistance ◽  
Parametric Study ◽  
Limit State ◽  
Ultimate Limit State ◽  
Optimal Selection ◽  
Optimal Variant ◽  
Ultimate Limit ◽  
Selection Of

This paper compares two concepts of composite timber concrete ceilings and their uncoupled alternatives based on a parametric study by comparing the final deflections of individual variants and at the same time considering according to the ultimate limit state. It includes a comparison of coupled and uncoupled variants while maintaining the same boundary conditions as the load, the thickness of the ceiling structure and the load width. By considering other factors, we can achieve more optimal variant, thanks to more accurate consideration of the required boundary conditions such as the complexity of installation or fire resistance. The purpose of this paper is to simplify the optimal selection of the ceiling structure based on the suitability of the supporting structure.

scholarly journals Reliability of reinforced concrete beams designed in accordance with Brazilian code NBR-6118:2014

2019 ◽  
Vol 12 (5) ◽  
pp. 1086-1125
Author(s):  
M. SCHERER ◽  
I. B. MORSCH ◽  
M. V. REAL
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Limit State ◽  
Design Tool ◽  
Reinforced Concrete Beams ◽  
Ultimate Limit State ◽  
Safety Level ◽  
Design Variables ◽  
Live Loads ◽  
Ultimate Limit

Abstract This paper aims to evaluate the reliability indexes of reinforced concrete beams designed in accordance with brazilian code NBR-6118:2014 in relation to the ultimate limit state of flexure. The main statistics of the resistance model are obtained through Monte Carlo simulation using ANSYS software and its probabilistic design tool. The reliability indexes are evaluated by FORM, being performed a parametric study in order to assess the influence of the main design variables on the safety level reached. It can be noticed that the reliability indexes are shown unsatisfactory in the combinations which the live loads are predominant.

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