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Newsletter October 2016 Dear ATENA friends, after a lot of months of intensive work, we are comming close to the release of a new ATENA version 5.4, which represents another step in our software development. The most important new features are described in our October newsletter along with a selected successful application example from our users. We would also like to invite you to our training seminars to visit us during the comming presentations or exhibitions and to have a look at our latest papers with other interesting examples or description of the theorethical background of ATENA.
New Release of ATENA Software New ATENA v5.4 is planned to be released in November! Public beta version of ATENA 5.4 will be soon available for testing. In case you are interested in, please contact us at
[email protected]. The new version brings many new and interesting features based on the suggestion and feedback of our ATENA users.
New finite elements: ATENA now supports also classical 1D beam and 2D shell elements. ATENA was always a specialized software for detailed reinforced concrete analysis. As such the emphasis was always on 2D/3D analysis using continuum based elements, which were enhanced by our specialized 3D beam and shell elements. ATENA users, however, want to apply nonlinear analysis to large scale structural problems, when classical beam and shell elements provide an efficient option. They are formulated as fiber beam elements and layered shells that can be easily combined with full continuum based 2D/3D elements. In this way efficient models for large scale structures can be created, while preserving the option to model critical structural details with full continuum threedimensional based models.
Building model using 2D shell and 1D beam elements showing the moment development in the columns
A beam can be modeled using solid contiunuum based elements or shell or beam elements
New features in ATENA Studio: ATENA Studio is our unique software, where our users can immediately see how the structure responds to the applied actions. Our unique runtime and postprocessing system is now enhanced by the following features: Evolution diagrams of reinforcement quantities such as stresses, strains, etc.
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Evolution of moments along the main bridge composite steelconcrete beam
Calculation and visualization of internal forces, i.e. moments, torsion or shear forces, for beam/shell elements as well as for continuum based elements. This greatly simplifies the application in design or assessment of existing structures User defined views and visualization parameters can be saved and shared among various ATENA Studio projects
Concrete cracking above the main support, moment evolution and deflection of a composite steelconcrete bridge analyzed by ATENA
New modelling of prestressing losses: The improved bond model enables very accurate and detailed modeling of prestressing losses due to friction and cohesion in tendon pipes as well as the subsequent tendon grouting with increased bond properties. Bond model can be activated in ATENA just by a single mouse click, no need for special interface elements or other complicated modeling tricks. Loads at arbitrary locations: Loads can be now applied at arbitrary locations, i.e. at point, lines or surfaces that do not need to be part of any geometric entity. This new feature greatly simplifies the application of complex loading patterns or moving loads. Top evolution of prestressing with losses, Bott. internal crack development and tendon stresses before failure
New tutorials: Several new tutorials have been developed and are available for download. They provide a step by step guidance in some of the typical ATENA application areas: Tutorial for ATENA Science GiD FRC Analysis of fiber reinforced concrete structures, where one of the main problems the user typically need to solve is the proper definition of the fiber reinforced concrete material parameters. This process typically involves an inverse analysis of standard material tests. This process is in detail described in this tutorial with an application to segmental tunnel lining. Crack development in the analysis of FRC tunnel tubbing
Tutorial for ATENA Science GiD Strengthening Strengthening by carbon fiber rods, lamellas or sheets is another application domain, where simulation with ATENA can be extremely useful. There are 4 possible approaches in ATENA for these problems, and this manual provides a step by step guidance and handson experience.
Layers in ATENA model with FRP strengthening
Tutorial for ATENA Science GiD Construction Process Construction process involves changing of structural geometry or properties during the construction. ATENA simulation system allows changes both in geometry, loads, boundary conditions as well as material properties at any time during the analysis.
The first tutorial covers the application area of bridge http://www.cervenka.cz/newsletters/october2016/
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construction. ATENA however supports also the modelling of tunnel construction process. This tutorial is currently under preparation and will be released before the end of the year. Please follow the download section on our website to learn about the new tutorials as they will be released. We are excited about these new developments in ATENA and we look forward to seeing them working for you in your industrial or research projects! Your ATENA team
Failure of a model strengthened by FRP fabric
ATENA Success Stories Nonlinear Flexural Response of Continuous Concrete Slab Strips Strengthened with Near Surface– Mounted Composites Jwan Alkhalil, Former Teaching Assistant and Tamer El Maaddawy, Associate Professor Dept. of Civil and Environmental Engineering, United Arab Emirates University ATENA was used for calculation of nonlinear flexural response of continuous RC slab strips strengthened with near surface–mounted (NSM) composite reinforcement in either the sagging or the hogging region.
Experimental and numerical sagging region
The study comprised experimental testing and three dimensional finiteelement (FE) modeling of eight twospan RC slab strips, 400 × 125 × 3,800 mm each. The amount of internal steel in the strengthened regions was approximately 30% of that of the unstrengthened regions. Flexural strengthening with NSM composites improved the stiffness and load capacity of continuous RC slab strips with no or insignificant reduction in the deflection at ultimate load. The gain in the loadcapacity due to strengthening was more pronounced for the slab strips strengthened in the sagging regions. Flexural strengthening reduced the moment redistribution ratio of the slab strips.
Experimental and numerical hogging region
The ratio further decreased by increasing the axial stiffness of the NSM composite reinforcement in the strengthened regions. The developed FE models provided more than reasonable prediction of the ultimate load by simulating the nonlinear structural behavior of the tested slab strips with good accuracy and predicting strain data not captured experimentally in some specimens. The validated FE models are considered a valuable and reliable alternative to the laboratory testing, which is costly, laborintensive, and timeconsuming.
Tensile steel strain (microstrain)
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ATENA Advanced User Seminar 2017 Dear users of ATENA software, we would like to invite you to our ATENA Advanced User Seminar 2017. The seminar will take place in Prague, the Czech Republic on February 810 in Czech language and June 1416, 2017 in English language. In 2016 the content of the seminar was rearranged compared to the previous years. We decided to concentrate on fewer topics, but provide deeper coverage and more handson experience with particular problems. Based on the feedback from our hotline support we selected several topics, where we expect that ATENA users could benefit most from more indepth explanation or background information:
Overview of new ATENA version 5.4. Modeling contact problems in ATENA. Modeling strengthening of reinforced concrete structures. Modeling of construction process in ATENA for bridges and tunnels. Modeling of fiberreinforced concrete structures.
New Distributor in Turkey Ahmet Erdem Duran 3e Mimarlık İnşaat ve Taah. Tic. Ltd Şti. İnönü Cad. Önder apt. No: 1 HATAY Web: www.3epromimarlik.co Web2: www.3epromimarlik.net Email:
[email protected] Phone: +90 532 376 05 30, +90 326 213 01 07
Mechanical Finder The New Biomechanical Software The agreement signed last month with Research Center of Computational Mechanics, Inc., Tokyo established Červenka Consulting as a distributor of the new biomechanical software Mechanical Finder in Europe. Mechanical Finder major features: 1. Build 3D structural model based on CT image. 2. Set up inhomogeneous material properties based on bone density (≒ CT value). 3. Create models with an implant. For more information, please contact us via email:
[email protected].
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Where You Can Meet Us October 1619, 2016 IALCCE 2016 Delft, Netherlands Event website October 2327, 2016 ACI Fall 2016 Philadelphia, USA Event website November 30 December 1, 2016 Concrete Days 2016 Litomyšl, Czech Republic Event website
Recent Articles BELETTI, B., ČERVENKA, V., DAMONI, C., HENDRIKS, M.A.N.: Catenary Action Effects on the Structural Robustness Assessment of RC Slab Strips Subjected to Shear and Tensile Forces, fib Journal Structural Concrete, December 2016 ČERVENKA, J., ČERVENKA, V., PUKL, R., SAJDLOVÁ T.: Prediction of Shear Failure of Large Beam Based on Fracture Mechanics, in: Proceedings of Fracture Mechanics for Concrete and Concrete Structures Conference, Berkeley, USA, May 2016 BALÁŽ, D., GRAMBLIČKA, M., MAREK, M., PUKL, R., SAJDLOVÁ T., SCHNEIDER, J., STAŠ, M.: Nonlinear Analysis of SFRC Segmental Tunnel Linning, in: Proceedings of Underground Constructions Conference, Prague, Czech Republic, May 2016 ČERVENKA J., HÁJKOVÁ, K., JENDELE, L., ŠMILAUER, V.: Prediction of Reinforcement Corrosion Due to Carbonation and Chloride Ingress up and beyond Induction Period, in: Proceedings of European Congress on Computational Methods in Applied Sciences and Engineering, Crete Island, Greece, June 2016 ALSAOUDI, A., ČERVENKA J.: Numerical Analysis Assessment on Fatigue Behaviour of CFRP Laminate in Concrete Blocks, in: Proceedings of Central Europe towards Sustainable Building Conference, Prague, Czech Republic, June 2016 ČERVENKA, J., ČERVENKA, V., PUKL, R.: Application of Global Safety Formats from Model Code 2010 for Design and Structural Assessment by Nonlinear Analysis, in: Proceedings of Conference on Concrete under Severe Conditions Environment & Loading, Lecco, Italy, September 2016
Newsletter October 2016
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