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Newsletter May 2015

New Release of ATENA Software

ATENA 5.1.1t Release


Dear friends of ATENA software,

we are very happy to inform you about the new release of ATENA version 5.1.1t. It brings you several very interesting new features in our flagship product ATENA Science, which should enhance your productivity and give you new capabilities and post-processing options that will deepen your understanding of your concrete structures.


Main changes since 5.1.1n:

  • Context help in ATENA Studio
  • Rupture of reinforcement with the Bilinear with Hardening law is now considered in ATENA 3D (at eps_lim)
  • Updated ATENA-GiD scripts
  • Changes in the colour scale and graphs in the ATENA Studio GUE
  • Fixed problem generating the mesh for small macroelements in ATENA 2D
  • Numerous smaller fixes and improvements in ATENA Studio, ATENA 3D, SARA, Update Check, the Kernel, and in the installer
  • New GiD version 12.0.4 included in the installation
  • New hardlock drivers included in installation: Hasp 6.65
  • Updated Examples
  • Updated Manuals
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The users with valid ATENA maintenance agreement are entitled to get the new ATENA version 5.1.1t for free. If your maintenance has expired, please contact us at cervenka@cervenka.cz for an upgrade quotation.

The recommended way to get the current ATENA version is to run the ATENA Update Check utility. Alternatively, you can download the file from our website.

In case you didn´t update your HASP for the new ATENA version 5 yet, you can find the instructions here.

ATENA version 5.2

We are working now on a new version 5.2, which is planned to be released in September 2015. This version will present some interesting new features, which have been requested by our users.

Some of the major new features are:

  • Modelling of beams and shells using classical 1D and 2D elements in addition to the standard ATENA feature of modelling beams and shells as full 3D elements. This feature simplifies the modelling of large scale buildings or bridges.
  • Improved and simplified modelling of construction process, where new element groups can be added, removed or their material can be changed anytime during the analysis process. This can be combined with the ATENA standard variable material to define time dependent material properties or the creep model to simulate long term effects in reinforced concrete structures.
  • New version of the SARA studio for probabilistic and reliability analysis. Now it is possible to apply the probabilistic approach also with ATENA Science like it was previously possible with ATENA 2D and 3D Engineering, but now it is possible to consider the statistical parameters in other problem types as well such as thermal, dynamics or creep. In addition, the new version supports the randomization of any type of input data such as: geometry, loads or material parameters.

ATENA Success Stories

Unprotected timber-fibre reinforced concrete slab in fire

Software ATENA Science was used to perform material test models together with thermal and static analysis of a real-size experiment by Mr. Lukáš Blesák and Mrs. Eva Caldová under the leadership of Prof. Wald at Czech Technical University in Prague.
Coupled timbre-SFRC structure (SFRC - steel fibre reinforced concrete) exposed to the actions of elevated temperature and mechanical loading represents both geometrically and physically non-linear problem. Numerical simulation of such a complex problem requires a certain amount of preliminary research in order to define not only the proper thermal and mechanical properties of the applied materials, which is rather essential, but also defining the most suitable way of performing a numerical simulation considering the mesh size, finite elements type, solution method, interval step size and other.

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Fig.1: Preliminary modelling – verification of membrane action – principal stresses pattern in phase when beams being burned away – deflection loaded + Temperature distribution in beam-slab connection area

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Fig.2: Time - deflection diagram

The results of ATENA calculations were compared with the experimental ones in parallel. Pre-processor GiD and consequently Atena Science solver were applied. The results were analysed and a further discussion was open. The ongoing project is majorly focused on definition of SFRC material properties in elevated temperature and the global behaviour of structures made of such material.

The ability to simulate civil structures in such conditions helps to understand and predict their behaviour in real fire scenarios, propose a further research in this filed and so improve the application of fibre concrete into the civil engineering practice.

Ramboll / Vårbybridge


We would like to present one of the analyses carried by our colleague Jukka Ikaheimonen from Ramboll Sweden, the Vårbybridge (road E4 Stockholm).

Due to cracking in the columns, strengthening with additional steel columns has been considered (Fig.1). The column has been modelled in ATENA Engineering 3D, reinforcement represented with discrete 1-D bars.

The real crack pattern has been reproduced with the nonlinear analysis (Fig.3), and the results have verified the bearing capacity is adequate (moment capacity in the ultimate stage, shear resistance in the ultimate stage, and fatigue strength of the concrete have been checked). The conclusion: injecting cracks for durability reasons is the only action needed to be taken.

Currently, other bridges in Sweden are being analyzed with ATENA by the Ramboll team.

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Fig.1: Vårbybridge (road E4 Stockholm), cracks + possible strengthening with steel columns

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Fig.2: Calculated stress in the reinforcement

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Fig.3: Calculated cracks in the columns

Our sincere congratulations for great achievement to Prof. Bažant!

Zdeněk P. Bažant is the only engineer among 10 foreign members out of  47 fellows elected this year to the Royal Society of London.

One of just a few top-cited researchers in his field, Bažant is best known for his discovery of the scaling law for the energetic size effect in quasibrittle structural failure.

He is also the author of the microplane material model suitable for modeling brittle materials such as concrete. The versions M4 and M7 of this unique material model are also available in ATENA software.

 

ATENA User Seminar 2015

This year´s ATENA seminar in English language is planned for June 10-12.
The seminar will take place in Prague, Czech Republic, Faculty of Civil Engineering at the Czech Technical University.

Our seminars are focused on ATENA Science version 5, which includes an updated GiD interface and new features for modelling concrete hydration, seismic and pushover analysis. The seminars are targeted for advanced ATENA users as well as beginners, who wants to learn more about the theoretical background of ATENA and its advanced application areas such as GiD-pre/post-processing, dynamic, eigenvalue, creep, thermal, or fire analyses. The ATENA Science version 5 is presented and used throughout the seminars. This new version includes a totally reworked runtime and postprocessing environment ATENA Studio, which replaces the previous program AtenaWin, and represents the basis for future ATENA development.

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Where You Can Meet Us

May 18-20, 2015
fib Symposium Copenhagen
Copenhagen, Denmark
Event website

May 28-29, 2015
Modelling in mechanics
Ostrava, Czech Republic
Event website

June 1-3, 2015
HPFRCC-7: 7th RILEM Conference on High Performance Fiber Reinforced Cement Composites
Stuttgart, Germany
Event website

September 10-11, 2015
Fibre Concrete 2015
Prague, Czech Republic
Event website

October 1-2, 2015
11th Central European Congress on Concrete Engineering 2015
Hainburg, Austria
Event website

November 25-26, 2015
Concrete Days 2015
Hradec Králové, Czech Republic
 

Recent Articles

KADLEC, L., ČERVENKA, V., UNCERTAINTY OF NUMERICAL MODELS FOR PUNCHING RESISTANCE OF RC SLABS, fib Symposium Copenhagen, 2015-05-04

PUKL, R., SAJDLOVÁ, T., MIKOLÁŠKOVÁ, J., PRYL, D., KABELE, P., HAVLÁSEK, P., Recent Tasks and Requirements to Computer Analysis of Concrete Structures, in: Proceedings of the 10th CCC Congress Liberec 2014, Czech concrete society, ISBN 978-80-903806-6-0

PUKL, R., SAJDLOVÁ, T., NOVÁK, D., LEHKÝ, D., Fracture-Mechanical Parameters for Modeling of Quasi-Brittle Materials and Structures, Advanced Materials Research Vol. 1106 (2015) pp. 106-109, Trans Tech Publications, Switzerland

PUKL, R., SAJDLOVÁ, T., NOVÁK, D., LEHKÝ, D., Lomově-mechanické parametry pro modelování kvazikřehkých materiálů a konstrukcí, Betonářské dny, Hradec Králové, ČBS 2014

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