Modeling the hysteretic responses of RC shear walls under cyclic loading by an energy-based plastic-damage model for concrete

2019 ◽  
Vol 29 (1) ◽  
pp. 184-200
Author(s):  
Shen Zhang ◽  
Ming Cheng ◽  
Jie Wang ◽  
Jian-Ying Wu
Keyword(s):  
Cyclic Loading ◽  
Software Package ◽  
Damage Evolution ◽  
Failure Modes ◽  
Damage Model ◽  
Shear Walls ◽  
Benchmark Tests ◽  
Plastic Damage ◽  
Commercial Software Package ◽  
Evolution Laws

This paper addresses application of an energy-based plastic-damage model for concrete to the modeling of hysteretic responses of reinforced concrete (RC) shear walls. Both damage evolution and plastic flows are accounted for within the framework of thermodynamics, resulting in consistent energy-based damage evolution laws. The model is implemented in the commercial software package ABAQUS via the user-defined material subroutine and applied to two representative benchmark tests of RC shear walls under cyclic loading. It is shown that with the steel reinforcement properly accounted for, the energy-based plastic-damage model can capture realistically the failure modes, load capacities, and overall load–deformation responses of RC shear walls.

Damage Evolution and Failure Modeling in Unidirectional Graphite/Epoxy Composite

2001 ◽  
Author(s):  
G. P. Tandon ◽  
R. Y. Kim
Keyword(s):  
Damage Evolution ◽  
Failure Modes ◽  
Epoxy Composite ◽  
Damage Model ◽  
Tensile Loading ◽  
Unidirectional Composite ◽  
Concentric Cylinder ◽  
Failure Modeling ◽  
Stress Levels

Abstract A study is conducted to examine and predict the micromechanical failure modes in a unidirectional composite when subjected to tensile loading parallel to the fibers. Experimental observations are made at some selected stress levels to identify the initiation and growth of micro damage during loading. The axisymmetric damage model of a concentric cylinder is then utilized to postulate and analyze some failure scenarios.

Constitutive Theory of Elastoplastic Coupled with Damage of Anisotropic Concrete

2012 ◽  
Vol 166-169 ◽  
pp. 3220-3223
Author(s):  
Jiang Qing Xiao ◽  
Qing Zhang ◽  
Dao Hong Ding
Keyword(s):  
Damage Evolution ◽  
Damage Model ◽  
Irreversible Thermodynamics ◽  
Constitutive Theory ◽  
Loading Conditions ◽  
Evolution Law ◽  
Plastic Damage ◽  
Elastoplastic Damage

A coupled elastoplastic damage model is proposed for the description of anisotropic concrete under compression-dominated stresses. The model is applied to typical concrete in various loading conditions. Damage evolution law and plastic damage coupling are described by using the framework of irreversible thermodynamics.

Equivalent Ductility Damage Model for Seismic Response of RC Structures: Test and Verification

2010 ◽  
Vol 163-167 ◽  
pp. 1714-1718
Author(s):  
Guang Ming Chang ◽  
Guo Hua Xing ◽  
Bo Quan Liu
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Damage Model ◽  
Damage Index ◽  
Shear Walls ◽  
Rc Structures ◽  
Index Model ◽  
Concrete Members ◽  
Ultimate Failure ◽  
Total Structure

. It is possible to quantify the damage to reinforced concrete members under cyclic loading through a nondimensional parameter known as a “damage index”. The damage index can be either a global damage index for the total structure, or a local damage index for the element level. In this paper, a new damage model termed “equivalent ductility damage model” has been suggested for evaluation of the damage index, which is consistent with accepted definitions of ductility. Substructure method was applied to verify the suggested new damage model. A total of 3 identical half-scale reinforced concrete columns were tested under variable amplitude cyclic loading up to the ultimate failure of the specimens. The imposed displacement histories were obtained from analytical simulations of the model column subjected to a series of earthquakes. Test observations indicate that the proposed model predicts 100 percent damage at the ultimate failure state of the element. The proposed damage index model can be extended to other structural elements, such as shear walls, beams, beam-column junctions, etc.

scholarly journals Simplified nonlinear analysis of reinforced concrete coupling beams subjected to cyclic loading

2020 ◽  
Vol 19 (3) ◽  
pp. 224-232
Author(s):  
Rafael Alves de Souza ◽  
◽  
Sergio F. Brena ◽  
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Nonlinear Analysis ◽  
Failure Modes ◽  
Tall Buildings ◽  
Shear Walls ◽  
Monotonic Loading ◽  
Good Precision ◽  
Coupling Beams ◽  
Failure Loads

Reinforced concrete shear walls connected by coupling beams form an efficient structural system to resist earthquake and wind loads in tall buildings. However, the analysis of the effects caused by cyclic loading in this kind of system are not so straightforward. In the present paper, simplified nonlinear analysis using monotonic loading are used in order to obtain the behavior of tested coupling beams subjected to cyclic loading. Numerical results have shown that numerical monotonic loading is able to predict with good precision the yielding and the failure loads of the tested coupling beams subjected to cyclic loading. Both the cracking patterns and the predicted failure modes also followed the experimental behavior, ensuring that monotonic loading may be applied to have a first insight concerning cyclic loading.

scholarly journals Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Baoyun Zhao ◽  
Tianzhu Huang ◽  
Liu Dongyan ◽  
Dongsheng Liu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Rock Salt ◽  
Damage Evolution ◽  
Damage Model ◽  
Cyclic Creep ◽  
Cycle Life ◽  
Stress Strain ◽  
Three Stages

Due to the gas injection and production of underground salt caves during the operational phase, rock salt is often subjected to a combined stress of cyclic pressure and constant pressure. In order to investigate the damage evolution of rock salt under different combined stresses, the uniaxial cyclic loading test and cyclic creep test were carried out. The stress-strain curves, energy characteristics, energy dissipation, and damage of rock salt in the two experiments were analyzed and compared. The test results show that the stress-strain curves of the two tests presented three stages of “sparse”-“dense”-“sparse.” As the maximum stress increases, the stage of “dense” will decrease and the rock salt cycle life will decrease. The relationship between cycle life and Δσ (difference between maximum and minimum stress in the tests) is an exponential function under cyclic loading and a linear relationship under cyclic creep. Based on the experimental data, the energy dissipation of rock salt is analyzed. The damage variables were defined from the perspective of energy dissipation, and the damage evolution of rock salt under two tests was obtained. There are three corresponding stages of energy dissipation and damage: initial, constant speed, and acceleration. The damage model is obtained by inverse functioning the s function, and then the correction coefficient is added to the model to obtain the modified damage model. The modified damage model is compared with the experimental data. The results show that the model can accurately describe the three stages of rock salt damage. The significance of parameters in the modifying damage model is also discussed.

Chip Morphology Studies Using Separate Fracture Toughness Values for Chip Separation and Serration in Orthogonal Machining Simulations

2018 ◽  
Author(s):  
Jaimeen Patel ◽  
Harish P. Cherukuri
Keyword(s):  
Damage Evolution ◽  
Damage Model ◽  
Equivalent Plastic Strain ◽  
Chip Morphology ◽  
Threshold Value ◽  
Threshold Values ◽  
Orthogonal Machining ◽  
Evolution Laws ◽  
On Chip ◽  
Chip Separation

It is well known that the chip morphology predictions in machining simulations depend on the separation criteria used for modeling chip formation. In this paper, we propose to use two different criteria for chip separation and serration along with the Johnson-Cook damage model. The threshold value for chip separation is determined from machining experiments using the methodologies discussed in Patel et al. [1]. In addition, two separate damage evolution laws for chip separation and serration are used. Our results indicate that the choice of the evolution law and the threshold values of Gc used for chip separation and serration have a significant effect on chip shape and other field variables such as the equivalent plastic strain, cutting force, temperature, etc.

Nonlinear Analysis of Two Shear Walls Using Elastic Plastic Damage Model

2012 ◽  
Vol 182-183 ◽  
pp. 1581-1584
Author(s):  
Lin Lin ◽  
Cheng He Li ◽  
Hu Qi
Keyword(s):  
Static Loading ◽  
Damage Model ◽  
Shear Walls ◽  
Shear Wall ◽  
Damage Distribution ◽  
Elastic Plastic ◽  
Concrete Members ◽  
Plastic Damage ◽  
Proposed Model ◽  
Simulation Results

In this paper, the elastic plastic damage model for concrete under static loading previously proposed by Hu Qi et al. is developed in ABAQUS via UMAT, and it is verified by the simulation of two shear wall members under horizontal loading. The simulation results indicate that this constitutive model can accurately predict typical nonlinear performances of reinforcement concrete shear walls. Using the proposed model one can get the damage distribution of reinforced concrete members which is helpful for researchers to get the failure pattern of structures.

An elastic–plastic damage model considering capillary effect for petrol–water saturated sandstone

2017 ◽  
Vol 27 (10) ◽  
pp. 1516-1550
Author(s):  
HQ Yang ◽  
JF Liu ◽  
C Luo ◽  
XP Zhou
Keyword(s):  
Rock Mass ◽  
Constitutive Model ◽  
Damage Evolution ◽  
Water Immersion ◽  
Consistency Condition ◽  
Damage Model ◽  
Yield Condition ◽  
Elastic Plastic ◽  
Plastic Damage ◽  
Damage Constitutive Model

The mechanical behavior of surrounding rock mass is key important to the water-sealed petrol storage caverns because of the two phase environment. To investigate the strength and damage mechanism of rock mass under petrol–water immersion circumstance, an elastic–plastic damage constitutive model is proposed. The deformation work of rock mass is derived according to the mixture theory and averaging methods. In order to further study the capillary action influence of petrol–water liquid phase on the strength and stiffness of rock mass, the plastic yield condition considering petrol–water circumstance is proposed. Then, the stress–strain increment expression under the influence of both liquid and solid phase is deduced through the consistency condition. Meanwhile, the damage conditions of the rock mass under tensile and compressive stress differ a lot, so the rock mass damage model under petrol–water circumstance is established combining the tensile and compressive damage criterion and the damage evolution law. The proposed constitutive model is adopted to simulate the mechanical property and damage evolution feature of rock mass under axial compression. The results suggest that the increase in the petrol pressure leads to the improvement of the axial strength for rock mass and meanwhile, the occurrence of damage is also advanced. In addition, the elastic–plastic property of the rock material has been well developed below the stress peak point during this process. Ultimately, the proposed elastic–plastic damage constitutive model was verified by making comparisons between the theoretical calculating results and experimental results.

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