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5 ANALYTICAL STUDY ON STRESS STRAIN BEHAVIOUR OF
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Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,2 FINITE ELEMENT MODELLING. The finite element analysis softwares give a good approach to reinforced concrete members In ANSYS. modelling graphic user interface is used while in Calculix it is based on commands Table I shows different column. specimens which is used in this analytical studies To validate the results with experimental data the same specimens. used in the experimental programs 1 2 were used in this study These specimens were modelled in both the softwares. 2 1 Calculix Software, Calculix is a open source finite element analysis application that uses a similar input format to Abaqus It has. an implicit and explicit solver CCX written by Guido Dhondt and a pre and post processor CGX written by Klaus. Wittig The solver is able to solve static dynamic buckling analysis heat transfer etc Material nonlinearities as well as. geometrical nonlinearities can be introduced to solve more complex structural and mechanical problems Calculix. includes a complete element library for volumetric elements as well as quadratic formulations for plane stress plane. strain axi symmetric shells and beam elements,2 1 1 Calculix Input Deck. An input file is commonly called an input deck the characters from the asterisk to the first comma are called a. keyword and the keyword with associated data is called a card An input deck defines the finite element analysis. problem to be solved In general it contains a mesh definition material analysis type boundary conditions and output. 2 1 2 Geometry, Columns are modelled in the same way which is used in the experimental program. 2 1 3 Material Properties, Material properties such as Young s modulus and poisson s ratios are specified in the calculix inputdeck.
The following concrete and steel properties are defined in Calculix inputdeck and it is assigned in ANSYS. Compressive strength of concrete fc,Modulus of Elasticity of concrete Ec. Concrete density 25 kN m3,Poisson s ratio of concrete 0 2. Elastic modulus of steel Es,Poisson s ratio of steel 0 3. 2 1 4 Elements Used, 20 node brick element he20 or C3D20 was used for the modelling of both concrete and steel The C3D20. element is a general purpose quadratic brick element It can be used for linear and nonlinear problems Fig 1 shows the. he20 element,Fig 1 He20 element, Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14.
30 31 December 2014 Ernakulam India,Table 1 Details of the Column Specimens. Sl Size mm fc Eccentricity Reinforcements Section,1 500 x 500 x 1500 24 3 Long Reinf 16mm. C1 Ties 10mm,2 500 x 500 x 1500 24 3 Long Reinf 16mm. C2 Ties 10mm,3 200 x 200 x 800 48 3 Long Reinf 12mm. C3 Ties 8mm,4 500 C4 28 8 Long Reinf 16mm,Transverse Reinf 10mm.
5 500 C5 28 8 Long Reinf 16mm,Transverse Reinf 10mm. 6 200 x 200 x 800 49 20 Long Reinf 12mm,C6 Ties 8mm. 7 200 x 200 x 800 49 40 Long Reinf 12mm,C7 Ties 8mm. 8 200 x 200 x 800 49 60 Long Reinf 12mm,C8 Ties 8mm. 2 1 5 Loads and Boundary Conditions, Displacement boundary conditions are applied to all column models For concentric column models axial.
pressure is applied on the top of the specimen For eccentric column specimen axial pressure on the top plus couple of. forces at extreme edge on both sides of column faces were applied. Fig 2 shows different column modelled in Calculix, Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India, Fig 2 200x200x800 Fig 3 500x500x1500 s 60mm Fig 4 500x500x1500 s 40mm. Fig 5 500 s 300mm Fig 6 500 s 300mm, Fig 7 mesh of concrete Fig 8 mesh of reinforcements. 2 2 ANSYS Software, In ANSYS there are 3 stages for analysing a structure They are 1 Pre processing 2 Analysis and 3 Post. processing Discrete modeling is adopted for modeling column specimens. 2 2 1 Element Types, The Solid65 element was used to model the concrete This element has eight nodes with three degree freedom at.
each node A Link8 element was used to model steel reinforcement This element is a 3D spar element and it has two. nodes with three degrees of freedom, Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,Fig 9 solid65 element. Fig 10 link8 element,2 2 2 Modelling, Modelling of all column specimens using ANSYS were done by creating a three dimensional solid volume. Considering symmetry and to avoid complexity only quarter portion of the specimen is modelled After creating solid. volume meshing is done Meshing of reinforcement is not needed Because reinforcements were created in the modeling. through the nodes created by mesh of solid volume, The following Figs shows different steps in column modelling and modelled concrete part and reinforcement. part in ANSYS,Fig 11 solid volume Fig 12 meshed volume.
Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India, Fig 13 reinforcements of C1 Fig 14 reinforcements of C2. Fig 15 mesh of C3 Fig 16 reinforcements of C3, Fig 17 reinforcements of C4 Fig 18 reinforcements of C5. Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,3 STATIC ANALYSIS. Static analysis was performed in Calculix and ANSYS softwares The stress and strain diagram obtained from. the softwares were shown in following figures The peak stress and strain values were notted. Fig 19 stress diagram of C1 Fig 20 strain diagram of C1. Fig 21 stress diagram of C4 Fig 22 strain diagram of C4. Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India, Fig 23 stress diagram of C1 Fig 24 stress diagram of C1. Fig 25 stress diagram of C4 Fig 26 strain diagram of C4. 4 RESULTS AND DISCUSSIONS, The values obtained from the analysis is validated with the available experimental data The peak stress peak.
strain values were compared Stress strain curves were plotted. Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,Stress Strain,Stress MPa. 0 0 002 0 004 0 006, Fig 27 stress strain curve of C1 Fig 28 stress strain curve of C2. Stress Strain Stress Strain,Stress MPa,Stress MPa,40 Calculix. 20 Calculix,0 0 002 0 004,Strain Strain, Fig 29 stress strain curve of C3 Fig 30 stress strain curve of C4. Stress Strain,Stress Strain,Stress MPa,Stress MPa,Calculix Calculix.
15 ANSYS ANSYS,0 0 002 0 004 0 006 0 0 002 0 004 0 006. Strain Strain, Fig 31 stress strain curve of C5 Fig 32 stress strain curve of C6. Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,Stress strain,Stress MPa. 40 Calculix,0 0 001 0 002 0 003 0 004 0 005, Fig 33 stress strain curve of C7 Fig 34 stress strain curve of C8. Table II shows that comparison of peak stress and peak strain value from experimental and analytical study. both Calculix and ANSYS From the table it is clear that Calculix gives more closer values to the experimental values. than that obtained from ANSYS So Calculix is an excellent finite element software for the analysis of reinforced. concrete structures, Table 2 Comparison between Experimental and FEA study.
Experimental Calculix ANSYS 10, Peak Stress Peak Strain Peak Stress Peak Peak Stress Peak Strain. MPa MPa Strain MPa,1 27 44 0 0042 27 9 0 0049 29 25 0 0034. 2 32 11 0 0052 33 1 0 0051 35 59 0 0046,3 60 545 0 0027 61 0 0024 66 82 0 0025. 4 32 53 0 0032 33 2 0 0035 36 41 0 0023,5 40 76 0 0042 40 9 0 0043 42 85 0 0035. 6 68 34 0 0038 68 2 0 00385 71 47 0 0033,7 68 9 0 0037 69 0 00365 69 34 0 0035.
8 76 99 0 0039 77 0 00393 74 33 0 0037,4 CONCLUSIONS. The following major conclusions are drawn based on the analytical studies carried out under this investigation. Modelling of confined RC column with Calculix and ANSYS is possible. Plotted the stress strain curve of confined RC columns using the results obtained from softwares. Analysis results obtained in the present study by creating the model with concrete and reinforcement separately. and assigning the properties is more closer to the experimental value than the results obtained with conventional. model with properties assigning as RCC, Proceedings of the International Conference on Emerging Trends in Engineering and Management ICETEM14. 30 31 December 2014 Ernakulam India,For future work. Reinforced concrete columns subjected to lateral loads can be studied. Different type of structures with different types of reinforcements fibre reinforced etc can be studied. REFERENCES, 1 J Hoshikuma K Kawashima and A W Taylor Stress Strain Model for confined Reinforced concrete in. Bridge Piers ASCE Journal 1997 624 632, 2 Teng Hooi Tan and Ngoc Ba Ngugen Flexural Behaviour of High Strength Concrete Columns ACI Structural.
Journal 2005 19 26, 3 Shamim A Sheikh and Ching Chung Yeh Tied concrete column under axial load and flexure Journal of. Structural Engineering 2009 2780 2800, 4 Rami EID 1999 Compressive behaviour of steel confined square and circular reinforced concrete columns. 5 Dr Khaled S Ragab and Dr S I Zaki Stress strain behavior of concrete column with different types of. rectangular hoops 2009, 6 Ibrahim H H H Mac Grogor J G Test of Eccentrically loaded High Strength Concrete Column ACI Structural. Journal 1996 95 98, 7 J B Mander M J N Priestley and R Park Theoretical stress strain model for confined concrete Journal of. Structural Engineering 1988 1804 1826, 8 Metin Husem Selim Pul 2007 Investigation of stress strain model for high strength concrete.
9 S Lavanya Prabha J K Dattatreya and M Neelamegam Stress Strain Behaviour of Ultra High Performance. Concrete under Uniaxial Compression International Journal of Civil Engineering Technology IJCIET. Volume 5 Issue 3 2014 pp 187 194 ISSN Print 0976 6308 ISSN Online 0976 6316. 10 Adil M Abdullatif and Tareq S Al Attar Structural Behavior of Reed Evaluation of Tensile Strength. Elasticity and Stress Strain Relationships International Journal of Advanced Research in Engineering. Technology IJARET Volume 4 Issue 1 2013 pp 105 113 ISSN Print 0976 6480 ISSN Online.


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