Modelling concrete slabs subjected to fires using nonlinear layered shell elements and concrete damage-plasticity material

2021 ◽  
Vol 234 ◽  
pp. 111977
Author(s):  
Liming Jiang ◽  
M. Anwar Orabi ◽  
Jian Jiang ◽  
Asif Usmani
Keyword(s):  
Concrete Slabs ◽  
Layered Shell ◽  
Shell Elements ◽  
Concrete Damage ◽  
Concrete Damage Plasticity

scholarly journals An enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial loading conditions

2021 ◽  
Author(s):  
Mohammad Reza Azadi Kakavand ◽  
Ertugrul Taciroglu
Keyword(s):  
Uniaxial Tension ◽  
Damage Mechanics ◽  
Plain Concrete ◽  
Cyclic Behavior ◽  
Plasticity Model ◽  
Multiaxial Loading ◽  
Loading Conditions ◽  
Confined Compression ◽  
Concrete Damage ◽  
Concrete Damage Plasticity

AbstractSome of the current concrete damage plasticity models in the literature employ a single damage variable for both the tension and compression regimes, while a few more advanced models employ two damage variables. Models with a single variable have an inherent difficulty in accounting for the damage accrued due to tensile and compressive actions in appropriately different manners, and their mutual dependencies. In the current models that adopt two damage variables, the independence of these damage variables during cyclic loading results in the failure to capture the effects of tensile damage on the compressive behavior of concrete and vice-versa. This study presents a cyclic model established by extending an existing monotonic constitutive model. The model describes the cyclic behavior of concrete under multiaxial loading conditions and considers the influence of tensile/compressive damage on the compressive/tensile response. The proposed model, dubbed the enhanced concrete damage plasticity model (ECDPM), is an extension of an existing model that combines the theories of classical plasticity and continuum damage mechanics. Unlike most prior studies on models in the same category, the performance of the proposed ECDPM is evaluated using experimental data on concrete specimens at the material level obtained under cyclic multiaxial loading conditions including uniaxial tension and confined compression. The performance of the model is observed to be satisfactory. Furthermore, the superiority of ECDPM over three previously proposed constitutive models is demonstrated through comparisons with the results of a uniaxial tension-compression test and a virtual test.

scholarly journals Damage plasticity model for passively confined concrete

2019 ◽  
Vol 275 ◽  
pp. 02016
Author(s):  
Ben-ben Li ◽  
Hai-bei Xiong ◽  
Jia-fei Jiang ◽  
Yang Zhan
Keyword(s):  
Yield Stress ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Flow Rule ◽  
Good Prediction ◽  
Plasticity Model ◽  
Dilation Angle ◽  
Good Prediction Accuracy ◽  
Concrete Damage ◽  
Concrete Damage Plasticity

This paper presents a modified concrete damage plasticity model (CDPM) for passively confined concrete within the concrete damage plasticity theory frame in ABAQUS. The modified CDPM can be used to simulate concrete under non-uniform passive confinement, for example, Fiber-reinforced polymer (FRP)-confined square concrete columns. The modification of CDPM includes a flow rule and a strain hardening/softening criterion in which dilation angle and yield stress are important parameters. Based on the true-triaxial experiment results of passively confined concrete, the dilation angle and yield stress were determined considering different confinement stiffness and non-uniform confinement stiffness ratio. Finally, the modified CDPM were incorporated in the ABAQUS model. The prediction of the finite element model of FRP-confined square concrete columns shows good prediction accuracy.

Seismic Performance of a Concrete Highway Tunnel Using a Concrete Damage Plasticity Model

2016 ◽  
Vol 711 ◽  
pp. 966-973
Author(s):  
Joanna M. Dulinska ◽  
Izabela J. Murzyn
Keyword(s):  
Time History ◽  
Fe Model ◽  
Plasticity Model ◽  
Inelastic Behavior ◽  
Ground Acceleration ◽  
Highway Tunnel ◽  
Tunnel Section ◽  
Concrete Damage ◽  
Concrete Damage Plasticity ◽  
The Impact

In the paper a non-linear dynamic response of a concrete highway tunnel to a natural earthquake is presented. The acceleration time history of the registered shock was applied as seismic excitation acting in three directions. The peak ground acceleration (PGA) of the shock was 0.5 g. A three-dimensional FE model of the concrete tunnel section (600 m long) and surrounding soil layers was created with the ABAQUS software. To represent the inelastic behavior of the tunnel under the earthquake, a concrete damage plasticity model was assumed as a constitutive model for the concrete. A model of spatially varying ground motion, which takes so called “wave passage effect” was implemented for the dynamic analysis. Two velocities of seismic wave propagation were assumed: 500 and 1000 m/s. These velocities are typical for soft and stiff bedrock, respectively. It turned out that in case of stiffer bedrock, in which seismic waves propagate faster, the damage pattern shows less cracking than in case of soft bedrock. The distribution of plastic and damage computed indices also allowed to assess the impact of the shock on the structure. It turned out that the analyzed shock with PGA of 0.5 g was strong enough to cause severe destruction (cracking) in the tunnel lining. Finally, the transverse pattern of cracks, that was obtained from the calculations, was in good agreement with damages observed during severe earthquakes.

scholarly journals Modelling and analysis the effect of unbalanced moment directions on behaviour of edge column-slab connections

2018 ◽  
Vol 159 ◽  
pp. 01007 ◽  
Author(s):  
I Ketut Sudarsana ◽  
I Gede Gegiranang Wiryadi ◽  
Gede Adi Susila
Keyword(s):  
Experimental Data ◽  
Shear Force ◽  
Free Edge ◽  
Experimental Result ◽  
Element Analysis ◽  
Concrete Damage ◽  
Modelling Techniques ◽  
Concrete Damage Plasticity ◽  
The Moment ◽  
Punching Failure

This research investigates the effect of unbalanced moment directions on the behaviour of edge column slab connections using a finite element analysis. The analyses were done on subassembly edge column slab connections that were designed according to Indonesian Concrete Standard (SNI 2847:2013). Three unbalanced moment directions were considered namely perpendicular, parallel and inclined 45° to the slab free edge. The concrete damage plasticity (CDP) and truss elements in Abaqus were utilized to model and analyse the behaviour of concrete and reinforcement bars, respectively. The modelling techniques were first validated using an experimental result available in the literature. There are five parameters in the CDP model need to be validated to get convergent results with the experimental data. Using the CDP validated parameters, then seven specimen models were analysed under combined shear force and an unbalanced moment in three directions. The ratio of M/V was kept constant of 0.3. The results show that the punching failure capacity of connections having an unbalanced moment inclined 45° is smaller than that of an unbalanced moment perpendicular to the slab free edge, but higher than that of an unbalanced moment parallel to the slab free edge. The patterns of concrete strain are consistent with the moment directions. All tension rebars passing through column sections yield at the connection failures.

The Finite Element Analysis of RC Energy Absorption Columns Based on ABAQUS Software

2012 ◽  
Vol 174-177 ◽  
pp. 2122-2125
Author(s):  
Hua Ma ◽  
Hong Huan Wang ◽  
Zhen Bao Li ◽  
Xin Yu Sun ◽  
Xue Wei Zhang
Keyword(s):  
Energy Absorption ◽  
Viscosity Coefficient ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Element Analysis ◽  
Concrete Material ◽  
The Finite Element Analysis ◽  
Concrete Damage ◽  
Concrete Damage Plasticity ◽  
Abaqus Software

In this paper, the analysis work is conducted for simulating the experimental study on the energy absorption columns performed previously. The software ABAQUS is used for fulfillment of the research. The concrete damage plasticity model is adopted for the calculation of the macro-synthetic fiber-reinforced concrete material used in the columns. The viscosity coefficient and the damage factore of concrete are discussed, and the results analyzed agree with experimented.

Sign in / Sign up

Export Citation Format

Share Document