Service-load Behaviour of Braced Reinforced Concrete Columns with Rotational Spring Supports

1998 ◽  
Vol 1 (3) ◽  
pp. 193-201
Author(s):  
M.A. Bradford
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Second Order ◽  
Effective Length ◽  
Reinforced Concrete Columns ◽  
Effective Length Factor ◽  
Codes Of Practice ◽  
Service Load ◽  
Creep And Shrinkage ◽  
Time Dependent Analysis

A simplified mathematical model for the short-term and time dependent analysis of reinforced concrete columns subjected to eccentric loading and with rotational springs is developed. Such a column is typical of that in a sway-prevented frame. The analysis includes cracking at service loads, creep and shrinkage deformations, and second order slenderness effects. The second order deflections are compared with those predicted by use of the contentious effective length factor given in design codes of practice.

scholarly journals Inelastic Effective Length Factor of Nonsway Reinforced Concrete Columns

2009 ◽  
Vol 135 (9) ◽  
pp. 1034-1039 ◽  
Author(s):  
A. Bendito ◽  
M. L. Romero ◽  
J. L. Bonet ◽  
P. F. Miguel ◽  
M. A. Fernandez
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Effective Length ◽  
Reinforced Concrete Columns ◽  
Effective Length Factor

scholarly journals New Bi-modular Material Approach to Buckling Problem of Reinforced Concrete Columns

2016 ◽  
Vol 6 (1) ◽  
pp. 19 ◽  
Author(s):  
Ahmad Salah Edeen Nassef ◽  
Mohammed A. Dahim
Keyword(s):  
Differential Equation ◽  
Reinforced Concrete ◽  
Differential Equations ◽  
Concrete Columns ◽  
Neutral Axis ◽  
Reinforced Concrete Columns ◽  
New Approach ◽  
Codes Of Practice ◽  
Governing Differential Equation ◽  
Transverse Deflection

<p class="1Body">This paper was investigating the buckling problem of reinforced concrete columns considering the reinforced concrete as bi – modular material. Governing differential equations was driven. The relation between the non-dimensional transverse deflection and non-dimensional distance between centroid axis and the neutral axis "eccentricity" was drawn to enable the solution of the governing differential equation. The new approach was verified with different experimental results and different codes of practice.<strong></strong></p>

scholarly journals Experimental study of the strengthening effect of reinforced concrete columns jacketed under service load level

2018 ◽  
Vol 183 ◽  
pp. 02008 ◽  
Author(s):  
Pavlo Krainskyi ◽  
Yaroslav Blikharskyy ◽  
Roman Khmil ◽  
Zinoviy Blikharskyy
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Columns ◽  
Load Level ◽  
Strengthening Effect ◽  
Engineering Structures ◽  
Reinforced Concrete Columns ◽  
Technical Modification ◽  
Service Load

The need of structural retrofitting and strengthening of different buildings, engineering structures or their elements is always present. Among the main reasons are demages and material deterioration due to aging, improper maintenance or physical damages; planed repairs; reconstruction or extension of the building; technical modification or complete change of operations inside the building or the structure, etc. In some cases operation of the building during retrofitting or strengthening of its structures has to be partially or fully stopped. In other cases the strengthening process takes place while the building is still operational which means that structures are strengthened under service loads. The main goal of this research is to determine the strengthening effect of reinforced concrete jacketing applied to columns under service load level. For that the experimental study of six reinforced concrete columns were carried out: four reference columns, both strengthened by jacketing and unstrengthened and two strengthened under service load. The main results of the research are presented.

scholarly journals Numerical analysis of reinforced concrete shear walls with rectangular cross section

2020 ◽  
Vol 13 (6) ◽  
Author(s):  
Maurício Castelo Branco de Noronha Campos ◽  
Paulo Marcelo Vieira Ribeiro ◽  
Romilde Almeida de Oliveira
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Second Order ◽  
Order Effects ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Mesh Model

abstract: This study addresses a numerical analysis of reinforced concrete columns in which the lengths are significantly larger than their widths with a rectangular cross section. Numerical simulations of 1,440 cases were performed, each case simulated with the single bar model, isolated bar model and mesh model, in addition, 3D model simulations were carried out. For the validation of 3D models and bar models, comparisons were made between the numerical simulation e experimental results of 24 reinforced concrete columns. Second order effects were analyzed on the vertical moment at the edge of the columns in which the lengths are significantly larger than the widths (localized second-order effects) and also the values of the horizontal moments along the cross sectional length in the mesh model. Influences of the main variables were observed influencing the behavior of the columns in which the lengths are significantly larger than their widths: the ratio between the cross sectional dimensions, the slenderness and the stresses (normal stress and bending moment around the axis of greatest inertia).

scholarly journals LONG-TERM STRENGTH AND DEFORMATIONAL ANALYSIS OF REINFORCED CONCRETE COLUMNS

2004 ◽  
Vol 10 (1) ◽  
pp. 67-75
Author(s):  
Valery Simbirkin ◽  
Robertas Balevičius
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Second Order ◽  
Reinforced Concrete Columns ◽  
Load Carrying ◽  
Non Linear ◽  
Internal Forces ◽  
Geometrical Effects ◽  
Extensive Experimental Data

The paper presents a method of non‐linear analysis of load‐carrying capacity and deformations of reinforced concrete columns subjected to long‐term loads. Physical relationships expressing non‐linear relations between internal forces and stresses, strains and stiffness are derived on the basis of the fracture and creep theories for concrete and using non‐linear stress‐strain diagrams modified for time effects. Second‐order geometrical effects are taken into account by solving a second‐order differential equation for elements subjected to compression and bending. A number of numerical and test results are presented. The technique proposed is verified by comparison of analysis results with extensive experimental data.

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