Multi-axial modeling of plain concrete structures based on an anisotropic damage formulation

2010 ◽  
pp. 163-171
Author(s):  
M Kitzig ◽  
U Häußler-Combe
Keyword(s):  
Concrete Structures ◽  
Plain Concrete ◽  
Anisotropic Damage ◽  
Damage Formulation

Estimating on Creep Strain for Ready-Mixed Concrete during Shrinkage

2013 ◽  
Vol 357-360 ◽  
pp. 684-688
Author(s):  
Liang Li Xiao ◽  
Ming Yang Pan ◽  
Meng Chen
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Creep Strain ◽  
Equilibrium Condition ◽  
Concrete Structures ◽  
Plain Concrete ◽  
Shrinkage Strain ◽  
Important Data ◽  
Experimental Part ◽  
Ready Mixed Concrete

This paper presents the development of formulas to estimate the creep strain of the reinforced concrete specimens. The experimental part of the work focused on the dispersion of shrinkage strain between reinforced concrete and plain concrete specimens, as well as the equilibrium condition between concrete tension and reinforcement compression. Based upon the experimental data and development formula, the creep strain and concrete age curves of the reinforced concrete specimens are drawn. Moreover, the characteristics of the creep strain are analyzed in detail. The creep strain formula can provide the important data and theoretic basis to “the code for design of concrete structures”（GB50010－2010）.

A new method for CDP input parameter identification of the ABAQUS software guaranteeing uniqueness and precision

2017 ◽  
Vol 8 (2) ◽  
pp. 264-284 ◽  
Author(s):  
Mojtaba Labibzadeh ◽  
Mojtaba Zakeri ◽  
Abdol Adel Shoaib
Keyword(s):  
Parameter Identification ◽  
Fe Simulation ◽  
Input Parameter ◽  
Concrete Structures ◽  
Plain Concrete ◽  
Experimental Results ◽  
New Method ◽  
Content Type ◽  
Input Parameters ◽  
Standard Software

Purpose The purpose of this paper is to present a new method for determining the input parameters of the concrete damaged plasticity (CDP) model of ABAQUS standard software. The existing available methods in the literatures are case sensitive, i.e., they give different input parameters of CDP for a unique concrete class used in different finite element (FE) simulation of concrete structures. In this study, the authors attempt to introduce a new approach for the identification of the input parameters of the CDP model, which guarantees the uniqueness and precision of the model. In other words, by this method, the input parameters obtained for a specific concrete class with a unique characteristic strength can be used for FE simulation of the different concrete structures which were constructed by this concrete without the need to additional modifications raised from any new application. Design/methodology/approach For the input parameter identification of the CDP model, different standard tests of plain concrete are simulated by the ABAQUS standard software. These test simulations are performed for various set of input parameters. In the end, those set of input parameters which represents the best curve fitting with the experimental results is chosen as the optimum parameters. Findings By comparison of the FE simulation results obtained from the ABAQUS for two different concrete structures using the proposed input parameters for the CDP model with the experimental results, it was shown that the presented method for determining those parameters can guarantee the uniqueness and precision of the CDP model in simulation. Originality/value The method described for determining the input parameters of the CDP model of the ABAQUS standard software has not been previously presented.

Fire Spalling Modeling of High Performance Concrete

2011 ◽  
Vol 52-54 ◽  
pp. 378-383 ◽  
Author(s):  
Jie Zhao ◽  
Jian Jun Zheng ◽  
Gai Fei Peng
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Vapor Pressure ◽  
High Performance ◽  
High Performance Concrete ◽  
Damage Model ◽  
Concrete Structures ◽  
Anisotropic Damage ◽  
Material Degradation ◽  
Moisture Contents

Under high temperature conditions, such as fire, high performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental damage to concrete structures. To prevent concrete from spalling, the mechanism should be understood. In this paper, an anisotropic damage model, in which both the thermal stress and vapor pressure are incorporated, is presented to analyze the spalling mechanism. The spalling phenomenon is studied based on two cases of different moisture contents. It is concluded that when the vapor pressure is present, concrete will behave much more brittlely.

scholarly journals FLEXURAL IMPROVEMENT OF PLAIN CONCRETE BEAMS STRENGTHENED WITH HIGH PERFORMANCE FIBRE REINFORCED CONCRETE

2017 ◽  
Vol 36 (3) ◽  
pp. 697-704
Author(s):  
MN Isa
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beams ◽  
Concrete Structures ◽  
High Strength ◽  
Plain Concrete ◽  
Analytical Investigation ◽  
Fibre Reinforced Concrete ◽  
Load Bearing Capacity ◽  
High Performance Fibre

Strengthening of concrete structures have become inevitable due to unavoidable factors such as fatigue and aggressive environmental conditions causing deterioration of concrete structures. Many researchers have turned in the direction of using various high strength and high performance concretes due to their high structural and durability properties, for the purpose of repair and strengthening of concrete structures against these aggressive conditions. As a result, this study carryout experimental, numerical and analytical investigation to study the behaviour of plain concrete (PC) beams strengthened with High Performance Fibre Reinforced Concrete (HPFRC) layer using three different jacketing configurations and tested in flexure. Results show significant improvement in both stiffness and load bearing capacity of plain concrete beams. http://dx.doi.org/10.4314/njt.v36i3.6

Sign in / Sign up

Export Citation Format

Share Document