Research on ultimate strength of confined concrete with circular stirrups: Research on ultimate strength of confined concrete with circular stirrups

2016 ◽  
pp. 465-468
Author(s):  
MengYuan Lu ◽  
Dongsheng Gu
Keyword(s):  
Ultimate Strength ◽  
Confined Concrete

scholarly journals Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 355
Author(s):  
Qudeer Hussain ◽  
Anat Ruangrassamee ◽  
Somnuk Tangtermsirikul ◽  
Panuwat Joyklad ◽  
Anil C. Wijeyewickrema
Keyword(s):  
Ultimate Strength ◽  
Predictive Models ◽  
Axial Stress ◽  
Low Cost ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Test Results ◽  
Stress Strain ◽  
Reinforced Polymer

This research investigates the behavior of square concrete columns externally wrapped by low-cost and easily available fiber rope reinforced polymer (FRRP) composites. This study mainly aims to explore the axial stress-strain relationships of FRRP-confined square columns. Another objective is to assess suitable predictive models for the ultimate strength and strain of FRRP-confined square columns. A total of 60 square concrete columns were cast, strengthened, and tested under compression. The parameters were the corner radii of square columns (0, 13, and 26 mm) and different materials of FRRP composites (polyester, hemp, and cotton FRRP composites). The strength and deformability of FRRP-confined specimens were observed to be higher than the unconfined specimens. It was observed that strength gains of FRRP-confined concrete columns and corner radii were directly proportional. The accuracy of ultimate strength and strain models developed for synthetic FRRP-confined square columns was assessed using the test results of this study, showing the need for the development of improved predictive models for FRRP-confined square columns. Newly developed unified models were found to be accurate in predicting the ultimate strength and strain of FRRP-confined columns.

Parametric Analysis of the Models of Confinement of the Concrete Column

2012 ◽  
Vol 498 ◽  
pp. 1-14 ◽  
Author(s):  
Kamal Ait Tahar ◽  
F. Taouche ◽  
Y. Bouamra
Keyword(s):  
Experimental Data ◽  
Ultimate Strength ◽  
Parametric Analysis ◽  
Ultimate Strain ◽  
Confined Concrete ◽  
Concrete Column ◽  
Strength Ratio ◽  
Concrete Properties ◽  
Concrete Confinement

Existing models for the concrete confined show a great respect in terms of effectiveness of confinement. The concrete confinement which consists in preventing these strains can be carried out either by an external envelope, or by a weak spacing between the stirrups. All models consist of some modification factors multiplying the unconfined concrete properties; these modification factors depend on the strength ratio and the confinement level. The relation of the ultimate strength ‘and ultimate strain in many existing models is complexity by representing. Each author gauges his model according to the experimental data. In this study, we present the results of a parametric analysis of some the most used models of confinement. The results show that the models of confinement have an important disparity between the values of the strength (fCC) and axial ultimate strain (εcc) of confined concrete.

Research on Cross-Sectional Area Converting Principle Based Model of FRP Confined Concrete Axial Compressive Strength

2011 ◽  
Vol 243-249 ◽  
pp. 5541-5546
Author(s):  
Tian Zhi Zhu ◽  
Ming Zhang ◽  
Yan Ying Dong
Keyword(s):  
Compressive Strength ◽  
Computational Model ◽  
Ultimate Strength ◽  
Cross Sectional Area ◽  
Confined Concrete ◽  
Sectional Area ◽  
Cross Sectional ◽  
Column Section ◽  
Cylindrical Column ◽  
Axial Compressive Strength

Fiber reinforced plastics (FRP) has been widely used in structure reinforcement processing. It is a comparatively mature field in computational models of cylindrical axial compressive strength on FRP confined concrete. In this paper, we conduct a possessive analysis on the axial compressive property that is based on the cylindrical stress model of FRP confined concrete, considering the difference among square column section, rectangular column and cylindrical column. Meanwhile, based on cross-sectional area and moment of inertia equivalent principles, we propose an equivalent diameter formula for converting rectangular column section into cylindrical column section. We also introduce sectional influence coefficients to modify ultimate strength and establish a model of ultimate strength for FRP confined concrete. Furthermore, we use the existing experimental data to test the validity and feasibility of the model. Experimental Results of the computational model are quite coincident and consistent with the tests. Computational model can reflect the true characteristics of FRP confined concrete. Therefore, the models proposed in this paper are significant in the practice of construction project.

scholarly journals Ultimate strength analysis of CFRP confined concrete using finite element method (FEM)

2019 ◽  
Vol 670 ◽  
pp. 012005
Author(s):  
Z Z Mukhtar ◽  
A H H AbWahid ◽  
A A Bakar ◽  
A Fitriadhy ◽  
M S Abdul Majid ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Confined Concrete ◽  
Strength Analysis ◽  
Element Method

Nonlinear modeling of ultimate strength and strain of FRP-confined concrete using chaos control method

2017 ◽  
Vol 163 ◽  
pp. 423-431 ◽  
Author(s):  
Behrooz Keshtegar ◽  
Pedram Sadeghian ◽  
Aliakbar Gholampour ◽  
Togay Ozbakkaloglu
Keyword(s):  
Ultimate Strength ◽  
Chaos Control ◽  
Control Method ◽  
Nonlinear Modeling ◽  
Confined Concrete

Ultimate strength of stiffened plates subjected to compression

1977 ◽  
Vol 1977 (141) ◽  
pp. 190-197 ◽  
Author(s):  
Yuzuru Fujita ◽  
Toshiharu Nomoto ◽  
Osamu Niho
Keyword(s):  
Ultimate Strength ◽  
Stiffened Plates

Regularities and properties of instrumented indentation diagrams obtained by ball-shaped indenter

2020 ◽  
Vol 86 (5) ◽  
pp. 43-51
Author(s):  
V. M. Matyunin ◽  
A. Yu. Marchenkov ◽  
N. Abusaif ◽  
P. V. Volkov ◽  
D. A. Zhgut
Keyword(s):  
Yield Strength ◽  
Ultimate Strength ◽  
Elastoplastic Deformation ◽  
Elastic Limit ◽  
Tensile Tests ◽  
Indentation Load ◽  
International Standards ◽  
Instrumented Indentation ◽  
Indentation Methods ◽  
Special Points

The history of appearance and the current state of instrumented indentation are briefly described. It is noted that the materials instrumented indentation methods using a pyramid and ball indenters are actively developing and are currently regulated by several Russian and international standards. These standards provide formulas for calculating the Young’s modulus and hardness at maximum indentation load. Instrumented indentation diagrams «load F – displacement α» of a ball indenter for metallic materials were investigated. The special points on the instrumented indentation diagrams «F – α» loading curves in the area of elastic into elastoplastic deformation transition, and in the area of stable elastoplastic deformation are revealed. A loading curve area with the load above which the dF/dα begins to decrease is analyzed. A technique is proposed for converting «F – α» diagrams to «unrestored Brinell hardness HBt – relative unrestored indent depth t/R» diagrams. The elastic and elastoplastic areas of «HBt – t/R» diagrams are described by equations obtained analytically and experimentally. The materials strain hardening parameters during ball indentation in the area of elastoplastic and plastic deformation are proposed. The similarity of «HBt – t/R» indentation diagram with the «stress σ – strain δ» tensile diagrams containing common zones and points is shown. Methods have been developed for determining hardness at the elastic limit, hardness at the yield strength, and hardness at the ultimate strength by instrumented indentation with the equations for their calculation. Experiments on structural materials with different mechanical properties were carried out by instrumented indentation. The values of hardness at the elastic limit, hardness at the yield strength and hardness at the ultimate strength are determined. It is concluded that the correlations between the elastic limit and hardness at the elastic limit, yield strength and hardness at the yield strength, ultimate tensile strength and hardness at the ultimate strength is more justified, since the listed mechanical characteristics are determined by the common special points of indentation diagrams and tensile tests diagrams.

Sign in / Sign up

Export Citation Format

Share Document