Inelastic Second-Order Analysis for Slender GFRP-Reinforced Concrete Columns: Experimental Investigations and Theoretical Study

2020 ◽  
Vol 24 (3) ◽  
pp. 04020016 ◽  
Author(s):  
Waseem Abdelazim ◽  
Hamdy M. Mohamed ◽  
Brahim Benmokrane
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Study ◽  
Concrete Columns ◽  
Second Order ◽  
Experimental Investigations ◽  
Reinforced Concrete Columns ◽  
Order Analysis

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).

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.

Design equations for axially loaded reinforced concrete columns strengthened with fibre reinforced polymer wraps

2000 ◽  
Vol 27 (5) ◽  
pp. 1011-1020 ◽  
Author(s):  
Michèle Thériault ◽  
Kenneth W Neale
Keyword(s):  
Reinforced Concrete ◽  
Load Capacity ◽  
Axial Loading ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Axial Load Capacity ◽  
Fibre Reinforced Polymer ◽  
Future Work

Step-by-step design procedures are proposed for the axial load capacity enhancement of circular and rectangular reinforced concrete columns confined with fibre reinforced polymer (FRP) wraps. The design methods are intended for practicing engineers in that they are relatively simple to apply and are made readily available in a design code format. Commentaries are presented to explain the design philosophy and rationale leading to the various design equations. For purposes of validation, numerical results based on the proposed design equations are compared against available experimental data. Strengthening limits, as governed by creep and fatigue phenomena, are also proposed. Whenever test data are found to be too limited, conservative approaches are adopted. Various experimental investigations are suggested for future work to further validate and update the design equations.Key words: FRP strengthening, concrete columns, axial loading, confinement, design.

IDENTIFICATION OF DAMAGE IN REINFORCED CONCRETE COLUMNS UNDER PROGRESSIVE SEISMIC EXCITATION STAGES

2011 ◽  
Vol 05 (02) ◽  
pp. 151-165 ◽  
Author(s):  
ZHISHEN WU ◽  
ADEKUNLE PHILIPS ADEWUYI ◽  
SONGTAO XUE
Keyword(s):  
Reinforced Concrete ◽  
Damage Identification ◽  
Concrete Columns ◽  
Shaking Table ◽  
Dynamic Loads ◽  
Strain Gauges ◽  
Experimental Investigations ◽  
Seismic Excitations ◽  
Reinforced Concrete Columns ◽  
Fbg Sensors

Prompt and accurate detection of realistic damage in constructed facilities is critical for effective condition assessment and structural health monitoring. This paper reports the experimental investigations of eccentric reinforced concrete columns mounted onto a shaking table and subject to progressively increasing seismic excitations. The investigation was aimed at studying the changes in the dynamic parameters in order to assess the structural conditions of the concrete columns after each post-seismic stage. The dynamic response of the structure was measured using accelerometers, traditional foil-strain gauges, and long-gauge fiber Bragg grating (FBG) sensors. The post-seismic conditions of the columns were evaluated via vibration-based damage identification methods. Results from this study demonstrate the applicability of specially packaged surface-mounted long-gauge FBG sensors for detecting the initiation and the progression of cracks due to reverse dynamic loads. The concept of modal macrostrain analysis was also introduced to identify and localize mild damage due to the applied seismic excitations of increasing intensities. The performance of the sensors for structural identification is also discussed.

Experimental Investigations of Loading Rate Effects in Reinforced Concrete Columns

2012 ◽  
Vol 138 (8) ◽  
pp. 1032-1041 ◽  
Author(s):  
W. Ghannoum ◽  
V. Saouma ◽  
G. Haussmann ◽  
K. Polkinghorne ◽  
M. Eck ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Loading Rate ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Reinforced Concrete Columns ◽  
Rate Effects

Preliminary Analysis of Concrete Filled Steel Tube Reinforced Concrete Columns under Axial Compression after Exposure to Fire

2014 ◽  
Vol 578-579 ◽  
pp. 772-775
Author(s):  
Wan Qing Yu ◽  
Qing Xin Ren ◽  
Lian Guang Jia
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Theoretical Study ◽  
Concrete Columns ◽  
Steel Tube ◽  
Element Analysis ◽  
Reinforced Concrete Columns ◽  
Concrete Filled Steel Tube ◽  
Composite Columns ◽  
Fea Model

In this paper, a further research has been carried on mechanical properties of concrete filled steel tube reinforced concrete columns after exposure to fire. A finite element analysis (FEA) model for concrete filled steel tube reinforced concrete columns after exposure to fire under axial compression is developed by ABAQUS. The temperature of cross-section element after exposure to fire has been obtained. The FEA model of temperature field is then used to investigate the mechanism of such composite columns further. Influences of parameters on Load-bearing Capacity such as fire duration time and steel ratio were analyzed. The work in this paper provides a basis for further theoretical study on concrete filled steel tube reinforced concrete columns after exposure to fire.

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