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Structural Engineering and Mechanics
  Volume 79, Number 6, September25 2021 , pages 779-789

Development of a lattice model for predicting nonlinear torsional behavior of RC beams
Yeongseok Jeong, Minho Kwon and Jinsup Kim

    Seismic design criteria based on performance of structures have recently been adopted by practicing engineers in response to destructive earthquakes. A simple but efficient structural-analysis tool capable of predicting both strength and ductility is needed to analyze reinforced concrete (RC) structures subjected to such events. Hence, a three-dimensional lattice model is developed in this study to analyze torsions in high-strength RC beams. Optimization techniques for determining optimal variables in each lattice model are introduced. Pure torsion tests of RC beams were performed to use to propose a threedimensional lattice model. The experimental test results of pure torsion on RC beam specimens were used to compare with numerical results obtained using the proposed model. Then, the proposed model was also compared to 3D solid model in commercial finite element analysis program, ABAQUS. Correlation studies between the numerical and experimental results confirm that the proposed model is well capable of representing salient features of the experimental results. Furthermore, the proposed model provides better predicted displacement corresponding to peak load. than the result from ABAQUS.
Key Words
    non-linear analysis; three-dimensional lattice model; torsional analysis
Yeongseok Jeong, Minho Kwon and Jinsup Kim: Department of Civil Engineering, Gyeongsang National University, Jinju 52828, South Korea

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