Cross sectional shape effects on the performance of post-heated reinforced concrete columns wrapped with FRP composites

2011 ◽  
Vol 93 (3) ◽  
pp. 1103-1117 ◽  
Author(s):  
M. Yaqub ◽  
C.G. Bailey
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Frp Composites ◽  
Shape Effects ◽  
Sectional Shape

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).

Influencing Factors Analysis on Temperature Field of Reinforced Concrete Columns under Fire

2013 ◽  
Vol 838-841 ◽  
pp. 648-652
Author(s):  
Jian Long Cao ◽  
Hai Tao Long ◽  
Wen Luo
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Heated Surface ◽  
Internal Surface ◽  
Concrete Columns ◽  
Element Analysis ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Section Size ◽  
The Impact

Using the finite element analysis software ABAQUS, the section temperature field of reinforced concrete columns under fire was analyzed. On this basis, the influence of the section size, the number of heated surface and the time of fire on the surface temperature were analyzed. Calculations indicate that the impact of the section size on temperature field cannot be considered when one surface was heated, three or surrounded by fire-sectional dimensions the influence was time-related. When the cross-sectional size reaches a certain value, the number of exposed surface on the temperature field can be neglected. Sectional temperature increased by time and the temperature rise rate is high at start then slow down close by fire surface, however, the rate is more stable all the time at internal surface.

Cross-Sectional Optimization of Reinforced Concrete Columns Considering both Economical and Environmental Costs

2012 ◽  
Vol 193-194 ◽  
pp. 1086-1089 ◽  
Author(s):  
Moacir Kripka ◽  
Guilherme Fleith de Medeiros
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Mathematical Formulation ◽  
Harmony Search ◽  
Music Performance ◽  
Concrete Columns ◽  
Optimization Method ◽  
Environmental Cost ◽  
Cross Sectional ◽  
Reinforced Concrete Columns

This work presents the development and implementation of a mathematical formulation for obtaining optimal sections of reinforced concrete columns subjected to uniaxial flexural compression. In order to minimize the cost of the reinforced concrete columns, the amount and diameters of the reinforcement bars and the dimensions of the columns cross sections were considered as discrete variables. The optimization was made by Harmony Search optimization method, a metaheuristic inspired by music performance. Initially, the economical cost of each material (concrete, steel and formwork) were considered, as usual in most optimization strategies. In the sequence, the lesser environmental cost was studied, by considering the Life Cicle Assessment (LCA) to determine the global warming potential. The results obtained led to a different configuration when the objective is a reduction in carbon dioxide (CO2) emissions, regarding the optimum economical cost.

scholarly journals OPTIMIZATION OF CROSS-SECTIONAL AREAS OF REINFORCED CONCRETE COLUMNS SUBJECTED TO AXIAL FORCE AND BIAXIAL BENDING VIA GENETIC ALGORITHMS

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Rodrigo Oliveira Cruz ◽  
Afonso Celso de Castro Lemonge
Keyword(s):  
Genetic Algorithm ◽  
Reinforced Concrete ◽  
Compressive Force ◽  
Concrete Columns ◽  
Optimization Techniques ◽  
Biaxial Bending ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Feasible Solutions ◽  
Financial Losses

The sizing of reinforced concrete structures is influenced by high magnitude forces and, as a result of its calculations, some designs may present specifications that are not optimum. In this case, it can occur exaggerated dimensions and an oversized structure resulting in financial losses and material wastes. Thus, it can be applied to the sizing, optimization techniques to achieve the best solution regarding, as an example, efficiency and material costs. This paper presents the optimization of cross-sectional areas of reinforced concrete columns using a Genetic Algorithm (GA) and considering the structure subjected to an axially compressive force and biaxial bending. It was developed an algorithm using the formulation of Araújo (2014) for the sizing associated with Deb’s Genetic Algorithm (2001). The developed software present solutions as cross-sectional areas of a column regarding the minimization of its costs and in which its reinforcement steel positions and diameters are optimized. Its dimensions and concrete resistance may also be optimized as a choice of the designer/engineer. The algorithm was applied to an example and had its solutions compared with other authors. Its results had achieved feasible solutions and shown similar costs.

Temperature Field Analysis of Concrete Filled Steel Tube Reinforced Concrete Columns in Fire

2014 ◽  
Vol 644-650 ◽  
pp. 5019-5022
Author(s):  
Xue Feng Liu ◽  
Qing Xin Ren ◽  
Lian Guang Jia
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Concrete Columns ◽  
Steel Tube ◽  
Parameter Analysis ◽  
Field Analysis ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Concrete Filled Steel Tube ◽  
In Fire

In this paper, temperature field analysis of concrete filled steel tube reinforced concrete columns in fire has been carried on. A finite element model for concrete filled steel tube reinforced concrete columns in fire is developed by ABAQUS. The cross-sectional temperature field distribution regularity of concrete filled steel tube reinforced concrete columns in fire has been obtained. Parameter analysis such as fire duration time and steel ratio on the column section temperature field is conducted, and this provide the reference for the further analysis of concrete filled steel tube reinforced concrete columns.

scholarly journals Structural Behavior of RC Columns Improved by Different Strengthening Techniques

2020 ◽  
Vol 28 (3) ◽  
pp. 20-28
Author(s):  
Shah Rukh Tariq ◽  
Liaqat Ali Qureshi ◽  
Babar Ali ◽  
Muhammad Usman Rashid
Keyword(s):  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Concrete Columns ◽  
Load Carrying Capacity ◽  
Cross Sectional ◽  
Rc Columns ◽  
Reinforced Concrete Columns ◽  
Existing Structures ◽  
Axial Capacity ◽  
Load Carrying

AbstractDeficient or deteriorating reinforced-concrete columns in many existing structures have to be strengthened using economical, efficient, and fast methods. In the present study, different strengthening techniques to improve the load-carrying capacity of reinforced concrete (RC) columns have been compared. Five groups of fifteen square reinforced concrete columns (150 mm × 150 mm × 600 mm) and one group of three circular columns ( φ 170 mm) that have cross-sectional areas equivalent to those of the square columns were cast from normal-strength concrete. The test program was designed to examine the behavior of columns strengthened by carbon fiber-reinforced polymer (CFRP), steel jacketing, ferro cement, steel fibers, and silica fumes under cyclic axial compression. The efficiency of each strengthening method in increasing the column’s axial capacity, energy absorption, and ductility was studied using the experimental data. The test results showed that strengthening the columns could significantly enhance their load-carrying capacity and failure strains.

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