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Structural Engineering and Mechanics Volume 68, Number 3, November10 2018 , pages 345-358 DOI: https://doi.org/10.12989/sem.2018.68.3.345 |
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Application of FE approach to deformation analysis of RC elements under direct tension |
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Ronaldas Jakubovskis, Rimantas Kupliauskas, Arvydas Rimkus and Viktor Gribniak
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| Abstract | ||
| Heterogeneous structure and, particularly, low resistance to tension stresses leads to different mechanical properties of the concrete in different loading situations. To solve this problem, the tension zone of concrete elements is reinforced. Development of the cracks, however, becomes even more complicated in the presence of bar reinforcement. Direct tension test is the common layout for analyzing mechanical properties of reinforced concrete. This study investigates scatter of the test results related with arrangement of bar reinforcement. It employs results of six elements with square 60x60 mm cross-section reinforced with one or four 5 mm bars. Differently to the common research practice (limited to the average deformation response), this study presents recordings of numerous strain gauges, which allows to monitor/assess evolution of the deformations during the test. A simple procedure for variation assessment of elasticity modulus of the concrete is proposed. The variation analysis reveals different deformation behavior of the concrete in the prisms with different distribution of the reinforcement bars. Application of finite element approach to carefully collected experimental data has revealed the effects, which were neglected during the test results interpretation stage. | ||
| Key Words | ||
| reinforced concrete; heterogeneous material; tension tests; numerical modeling; stochastic effects; arrangement of reinforcement; deformations | ||
| Address | ||
| Ronaldas Jakubovskis and Viktor Gribniak: Laboratory of Innovative Building Structures, Vilnius Gediminas Technical University (VGTU), Sauletekio av. 11, Vilnius LT-10223, Lithuania Rimantas Kupliauskas: Department of Storm-Water Network, Grinda Ltd., Eiguliu str. 32, Vilnius LT-03150, Lithuania Arvydas Rimkus: 1) Laboratory of Innovative Building Structures, Vilnius Gediminas Technical University (VGTU), Sauletekio av. 11, Vilnius LT-10223, Lithuania 2) Laboratory of Composite Materials, VGTU, Vilnius, Lithuania | ||