scholarly journals Damage Analysis and Evaluation of High Strength Concrete Frame Based on Deformation-Energy Damage Model

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Huang-bin Lin ◽  
Shou-gao Tang ◽  
Cheng Lan
Keyword(s):  
High Strength Concrete ◽  
Damage Model ◽  
High Strength ◽  
Deformation Energy ◽  
Model Parameters ◽  
Force Model ◽  
Damage Evaluation ◽  
Cycle Number ◽  
Strength Concrete ◽  
Unloading Stiffness

A new method of characterizing the damage of high strength concrete structures is presented, which is based on the deformation energy double parameters damage model and incorporates both of the main forms of damage by earthquakes: first time damage beyond destruction and energy consumption. Firstly, test data of high strength reinforced concrete (RC) columns were evaluated. Then, the relationship between stiffness degradation, strength degradation, and ductility performance was obtained. And an expression for damage in terms of model parameters was determined, as well as the critical input data for the restoring force model to be used in analytical damage evaluation. Experimentally, the unloading stiffness was found to be related to the cycle number. Then, a correction for this changing was applied to better describe the unloading phenomenon and compensate for the shortcomings of structure elastic-plastic time history analysis. The above algorithm was embedded into an IDARC program. Finally, a case study of high strength RC multistory frames was presented. Under various seismic wave inputs, the structural damages were predicted. The damage model and correction algorithm of stiffness unloading were proved to be suitable and applicable in engineering design and damage evaluation of a high strength concrete structure.

Damage Model for Monotonic and Fatigue Response of High Strength Concrete

2000 ◽  
Vol 9 (1) ◽  
pp. 57-78 ◽  
Author(s):  
A. H. Al-Gadhib ◽  
M. H. Baluch ◽  
A. Shaalan ◽  
A. R. Khan
Keyword(s):  
High Strength Concrete ◽  
Damage Model ◽  
High Strength ◽  
Strength Concrete

Damage Model for Monotonic and Fatigue Response of High Strength Concrete

2000 ◽  
Vol 9 (1) ◽  
pp. 57-78 ◽  
Author(s):  
A. H. AL-GADHIB ◽  
M. H. BALUCH ◽  
A. SHAALAN ◽  
A. R. KHAN
Keyword(s):  
High Strength Concrete ◽  
Damage Model ◽  
High Strength ◽  
Strength Concrete

Parameters of Holmquist–Johnson–Cook model for high-strength concrete-like materials under projectile impact

2017 ◽  
Vol 8 (3) ◽  
pp. 352-367 ◽  
Author(s):  
Gen-Mao Ren ◽  
Hao Wu ◽  
Qin Fang ◽  
Xiang-Zhen Kong
Keyword(s):  
Compressive Strength ◽  
Test Data ◽  
High Strength Concrete ◽  
Triaxial Compression ◽  
High Strength ◽  
Model Parameters ◽  
Projectile Impact ◽  
Strength Concrete ◽  
Constitutive Parameters ◽  
Cook Model

Holmquist–Johnson–Cook constitutive model has been widely used in analyzing the dynamic responses of concrete-like materials under projectile impact and explosive loadings, the constitutive parameters of which were always referred from the original documents and only applied to the normal strength concrete with the compressive strength of 48 MPa. Aiming to confirm the Holmquist–Johnson–Cook model parameters for high-strength concrete-like materials (compressive strength ≥60 MPa), based on the available test data from the quasi-static uniaxial compression, triaxial compression, Split-Hopkinson pressure bar, as well as the Hugoniot experiments, the strength parameters, the strain rate parameter, and the equation of state parameters of Holmquist–Johnson–Cook model for high-strength concrete-like materials are determined. Using the finite element program LS-DYNA, total eight sets of projectile penetration and perforation tests on high-strength concrete (uniaxial compressive strengths of 67.5–157 MPa) and high-strength rock targets (uniaxial compressive strengths of 60 and 154 MPa) are numerically simulated, respectively. By comparisons with the test data of penetration depths and residual velocities of the projectiles, the verifications of the proposed parameters are validated, which provides the reference for the design of protective structures.

scholarly journals Compressive Fatigue Behaviour of High-Strength Concrete and Mortar: Experimental Investigations and Computational Modelling

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 319
Author(s):  
Nadja Oneschkow ◽  
Tim Timmermann ◽  
Stefan Löhnert
Keyword(s):  
Stress Level ◽  
High Strength Concrete ◽  
Coarse Aggregate ◽  
Damage Model ◽  
High Strength ◽  
Fatigue Behaviour ◽  
Computational Techniques ◽  
Material Strength ◽  
Strength Concrete ◽  
Fatigue Model

A high-strength concrete and mortar subjected to compressive fatigue loading were comparatively investigated using experimental and computational techniques. The focus of the investigations was on the influence of the coarse aggregate in high-strength concrete. Accordingly, the fatigue behaviour was analysed experimentally using the macroscopic damage indicators strain, stiffness and acoustic emission hits. The results clearly show differences in the fatigue behaviour between the concrete and the mortar, especially at the lower stress level investigated. The basalt coarse aggregate here improves the fatigue behaviour of the concrete. Indication of a negative effect can be seen at the higher stress level. A finite element approach with a gradient-enhanced equivalent strain-based damage model combined with a fatigue model was used for the computational simulation of the fatigue behaviour. The damage model includes a differentiation between tension and compression. The fatigue model follows the assumption of the reduction in the material strength based on the accumulated gradient-enhanced equivalent strains. A random distribution of spherically shaped basalt aggregates following a given particle size distribution curve is used for the simulation of concrete. The comparison of the experimentally and computationally determined strain developments of the concrete and mortar shows very good agreement.

Experimental Study on the Fatigue Damage of High Strength Concrete under Uniaxial Compression

2014 ◽  
Vol 619 ◽  
pp. 109-115
Author(s):  
Li Hui Yin ◽  
Zong Lin Wang ◽  
Yang Liu
Keyword(s):  
Uniaxial Compression ◽  
Fatigue Damage ◽  
Fatigue Failure ◽  
High Strength Concrete ◽  
Damage Model ◽  
Correlation Coefficients ◽  
High Strength ◽  
Damage Variable ◽  
Strength Concrete ◽  
Recycle Ratio

This paper presents the results of a study on the fatigue damage of high strength concrete under uniaxial compression. Based on the experimental data, the change laws of fatigue strain and fatigue modulus are put forward. According to the experimental requests, the numerical value of fatigue strain and fatigue modulus when the fatigue failure of concrete occurs can be regarded as the criteria for fatigue failure of concrete. Then the paper presents a fatigue damage model. By reference to the concept about the damage variable defined by some scholars, the formula of the damage variable is proposed and the damage variable curves varying with recycle ratio (n%) are mapped. At last, the fitting curves of the damage variable varying with recycle ratio are proposed. The fitting effect is very good and the correlation coefficients are above 0.95.

Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash

2012 ◽  
Vol 2 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Suthar Sunil B ◽  
◽  
Dr. (Smt.) B. K. Shah Dr. (Smt.) B. K. Shah
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Strength Concrete
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