Numerical simulation of failure process of high-strength concrete using the discrete-element model

2020 ◽  
Vol 173 (3) ◽  
pp. 141-154
Author(s):  
Mahsa Payab ◽  
Reza Abbasnia ◽  
Mostafa Khanzadi
Keyword(s):  
Numerical Simulation ◽  
High Strength Concrete ◽  
Failure Process ◽  
High Strength ◽  
Element Model ◽  
Discrete Element ◽  
Discrete Element Model ◽  
Strength Concrete

Seismic behaviour of prestressed high-strength concrete piles under combined axial compression and cyclic horizontal loads

2018 ◽  
Vol 22 (5) ◽  
pp. 1089-1105 ◽  
Author(s):  
Xizhi Zhang ◽  
Sixin Niu ◽  
Jia-Bao Yan ◽  
Shaohua Zhang
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
High Strength Concrete ◽  
High Strength ◽  
Element Model ◽  
Test Results ◽  
Seismic Behaviour ◽  
Strength Concrete ◽  
Concrete Piles ◽  
Concrete Pile

In order to simulate the seismic behaviour of the prestressed high-strength concrete piles under working state, six full-scale prestressed high-strength concrete piles were tested under combined axial compression and cyclic horizontal loads. Different axial compression levels and prestressing levels of prestressed tendons were studied in this test programme. The failure mode, bending resistance, displacement ductility, stiffness degradation and energy dissipation of the prestressed high-strength concrete piles under different loading scenarios were measured and analysed. Test results indicated that the axial compression ratio and prestressing level of prestressed tendon significantly influenced the seismic performance of prestressed high-strength concrete piles. Theoretical models were developed to predict cracking, yielding and ultimate bending resistances of the prestressed high-strength concrete pile under combined compression and bending. Finite element model was also developed to simulate the ultimate strength behaviour of the prestressed high-strength concrete pile under combined compression and flexural bending. The accuracies of the theoretical and finite element model were checked through validations of their predictions against the reported test results.

Behaviour of reinforced high-strength concrete beam—column joint. Part II: numerical simulation

2004 ◽  
Vol 5 (3) ◽  
pp. 101-112 ◽  
Author(s):  
A. El-Nabawy Atta ◽  
S. El-Din Fahmy Taher ◽  
A.-H. A. Khalil ◽  
S. E. El-Metwally
Keyword(s):  
Numerical Simulation ◽  
High Strength Concrete ◽  
Concrete Beam ◽  
High Strength ◽  
Strength Concrete ◽  
Column Joint

scholarly journals Seismic Behavior Analysis of Damaged Steel Fiber-Reinforced High-Strength Concrete Frame Joints Strengthened by FRP

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Wang Tingyan ◽  
Zhou Yun ◽  
Zhang Junwei
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Strength Concrete ◽  
Seismic Behavior ◽  
Steel Fiber ◽  
High Strength ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Capacity Degradation

In this paper, the seismic behavior of fiber-reinforced polymer (FRP) strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic loading was tested. Then, the nonlinear finite element program was used to simulate the seismic behavior of FRP strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic repeated load. The influence of FRP bond direction on the seismic behavior of steel fiber-reinforced high-strength concrete frame joints was studied. Through the comparison of the test values and numerical simulation values of the hysteretic curve, skeleton curve, energy dissipation capacity, displacement ductility, bearing capacity degradation, stiffness degradation, and other performance indexes of frame joints, the rule was obtained. The results showed that the 45° bonding direction of carbon fiber cloth is better than the 0° bonding direction, and the digital simulation results are in good agreement with the test results. Therefore, the constitutive model, element, end constraint, and loading method used in the finite element numerical simulation of this paper were reasonable, which can provide reference for the similar research in the future.

scholarly journals Numerical Investigation of Stress Block for High Strength Concrete Columns

2020 ◽  
Vol 6 (5) ◽  
pp. 974-996
Author(s):  
Nizar Assi ◽  
Husain Al-Gahtani ◽  
Mohammed A. Al-Osta
Keyword(s):  
Finite Element ◽  
Intensity Factor ◽  
Finite Element Model ◽  
High Strength Concrete ◽  
Analytical Approach ◽  
High Strength ◽  
Element Model ◽  
Strength Concrete ◽  
Stress Block ◽  
The Finite Element Model

This paper is intended to investigate the stress block for high strength concrete (HSC) using the finite element model (FEM) and analytical approach. New stress block parameters were proposed for HSC including the stress intensity factor (α1) and the depth factor (β1) based on basic equilibrium equations. A (3D) finite element modeling was developed for the columns made of HSC using the comprehensive code ABAQUS. The proposed stress parameters were validated against the experimental data found in the literature and FEM. Thereafter, the proposed stress block for HSC was used to generate interaction diagrams of rectangular and circular columns subjected to compression and uniaxial bending. The effects of the stress block parameters of HSC on the interaction diagrams were demonstrated. The results showed that a good agreement is obtained between the failure loads using the finite element model and the analytical approach using the proposed parameters, as well as the achievement of a close agreement with experimental observation. It is concluded that the use of proposed parameters resulted in a more conservative estimation of the failure load of columns. The effect of the stress depth factor is considered to be minor compared with the effect of the intensity factor.

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