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Newsletter April 2014

ATENA version 5

Dear friends of ATENA software,

we are very pleased to remind you about the release of our new ATENA version 5. This version is the next step in our permanent effort to bring to your desk the latest achievements in nonlinear modelling of reinforced concrete structures. Our main emphasis is on the continuous development of our advanced ATENA Science product, which supports static, creep, dynamic, thermal and moisture transport analyses. Version 5 includes a new product ATENA Studio that brings the run-time control and post-processing comfort to a new level, which surpasses the high standard that was previously introduced by our ATENA Engineering 2D & 3D software.

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In future development we intend to complete the ATENA Studio by a modeller and pre-processor. Then the previous products ATENA 2D and 3D will be replaced by the new product ATENA Studio.

The users with valid ATENA maintenance agreement are entitled to free upgrade to the new ATENA version 5. This version  requires a modification to existing ATENA hardlocks as described below.

How to update to the new ATENA version 5

If you are a current ATENA user with valid maintenance program, you can directly follow the instructions below. If your maintenance has expired, please contact us at cervenka@cervenka.cz for an upgrade quotation.

In order to run ATENA 5 on your computer you need to first update your hardware key. For this you will need the HASP Remote Upgrade utility that can be downloaded from: http://www.cervenka.cz/downloads/ATENA500/RUS_MDTKB.exe. Then follow the update instructions that are described in the following manual: http://www.cervenka.cz/downloads/ATENA500/HASP_RU_Guide.pdf.

The manual will guide you through the whole process when you first send us the information about your ATENA key. Based on it we will send you a file to upgrade your key for the new version. Please understand that old keys (HASP4 USB or Parallel) can not be upgraded, and have to be replaced. In this case please contact us at cervenka@cervenka.cz.

In general, we recommend to run the ATENA Update Check utility time to time to get  the latest ATENA version.

Grant project of Czech Science Foundation:

In cooperation between VUT Brno (Prof. Drahomír Novák) and Červenka Consulting (Dr.-Ing. Radomír Pukl)

The project is focused on the efficient fully probabilistic assessment of concrete structures, mainly bridges, based on a stochastic nonlinear stochastic finite element simulation considering spatial variability degradation. Efficient numerical techniques to determine reliability expressed by reliability index and/or failure probability will be developed within the framework of computationally intensive nonlinear analysis. An attention will be paid to response surface methods and small-sample simulations combined with artificial neural networks. Life-cycle assessment requires time-dependent reliability analysis including degradation effects. Advanced models for concrete carbonation, corrosion of reinforcement and chloride ingress will be developed.

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Numerical example: AASHTO IV 711.2/1,828.8 mm; cross-section degradation evolution; 1,871 cells of 20 × 20 mm; the interval (0, 1) represents the relative chloride concentration

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Schematic triangle of topic keystones

Deterioration modeling will be extended into 2D space using random fields and cellular automata approach. The fully probabilistic approach will be verified in comparison with present code specifications.

The aim is to develop and apply methods for spatial degradation simulation and reliability assessment of concrete structures, mainly bridges. It includes effective reliability techniques enhancement, advanced degradation modeling and the verification in comparison with present code specifications.

ATENA Success Stories

Experiment at Swinburne University

Experiments on the performance of wide, post-tensioned band beams under seismic load have recently been undertaken at Swinburne University by PhD candidate Matthew Davey. Beam widths of around 2400mm are regularly used in Australian concrete floor systems, and are significantly wider than the supporting columns (commonly in excess of 4 times wider). These beams are required to be able to deform with a building during an earthquake and are increasingly being used as lateral resisting moment frames. However, relatively little is known about their performance under earthquake type loading. Thus far the experiments have shown good drift and ductility performance, with drifts of around 3% being achieved prior to any significant loss in capacity, which is suitable for low to moderate seismic zones. ATENA 3D is being used to model the test specimen. While analysis is still preliminary, model results are already showing a strong correlation to  those achieved in the experiment.

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The testing was undertaken in the Smart Structures Laboratory at Swinburne University of Technology in Victoria, Australia. The $15 million laboratory is a major three-dimensional testing facility developed for large scale testing of civil, mechanical, aerospace and mining engineering components and systems and the only one of its type available in Australia. The 1.0m thick strong floor measures some 20m x 8m in plan with two 5m tall reaction strong walls meeting at one corner. The 3D strong cell have a grid of tie down points 0.5m apart over the whole floor and walls to secure the test specimens, as well as a suite of hydraulic actuators and universal testing machines varying in capacity from 10 tonnes to 500 tonnes. Future acquisition includes a 2500 tonne testing machine. The laboratory contains the Hybrid Testing Facility (HTF) that allows for combined experimental and computer simulations interacting in real time to determine the response of structural systems.
This is a very cost-effective technique in which the structure, including foundations and soil conditions, are modelled numerically while critical components of it that are likely to experience excessive nonlinear/inelastic behaviour are modelled experimentally.

The interaction between the computer and physical simulations occur at the boundaries with high performance servo-hydraulic actuators and real-time feedback controllers. The versatile 6-DOF loading and boundary conditions system is capable of imposing complex multi-axial forces and displacements on full scale structures or sub-structures at multiple application points. The HTF can be effectively used in modelling, simulation and testing of structures subjected to extreme loading events generated by earthquakes, wind and ocean waves. Applications include structural safety of buildings, bridges, and offshore structures and development of efficient renewable energy systems.

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New version 2.0 of program AmQuake will be released in May

Based on the input from our users and to reflect changes in some national codes new version of our software AmQuake will be released in the coming month.

AmQuake is an easy to use program for checking seismic design of masonry or combined masonry, reinforced concrete buildings. It is using pushover analysis and equivalent frame method to verify the seismic design according to Eurocode 8.

The following major improvements are available in the new version 2.0:
- new Romanian CR6+P100 2013 building code
- seismic maps of individual countries are directly accessible in the program
- improved and more stable load stepping algorithm during the pushover analysis
- improvements in the automatic generation of the equivalent frame model
- many additional minor improvements and bug fixes

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ATENA User Seminar 2014

The seminar will take place in Prague, the Czech Republic on June 25-27, 2014 and is targeted to ATENA users, who want to learn more about the theoretical background of the ATENA version 5 and its advanced features such as ATENA 3D, GiD-pre-post/processing, dynamic, eigenvalue, creep, thermal or fire analyses.

The new ATENA version 5 will be used throughout the seminar. This new version includes a totally reworked runtime and postprocessing environment ATENA Studio that replaces the previous program AtenaWin, and represents the basis for future ATENA development. The main focus will be on the package ATENA Science, which includes an updated GiD interface and new features for modeling concrete hydration, seismic and pushover analysis.

More information you can find on the website: http://www.cervenka.cz/company/news/atena-user-seminar-2014

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Participation at Conferences

ATENA is growing in India

In February ATENA was presented at fib congress in Mumbai during the conference exhibition as well as in the scientific program. Jan Cervenka presented a paper titled: Application of Global Safety Formats from Model Code 2010 for Design and Structural Assessment by Nonlinear Analysis. With our local representatives, about the experiences in applying the new global safety formats in practical projects with ATENA.

Our local representative Mr. Amal Paul and his wife Sushmita helped to organize the exhibition stand, and they provided the excellent guidance and support during the subsequent tour of several Indian prime research and educational institutions.

A series of ATENA trainings was organized at JS College of Technology Mysore, BMS College Bengaluru and IIT Roorkee. We enjoyed the discussions and feedback of many young and enthusiastic engineers and students who use ATENA for their postgraduate studies and research in advanced behaviour and modelling of reinforced concrete structures.

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EURO-C Skiing Competition - the second place for Červenka Consulting!

EURO-C 2014

Jan Cervenka presented his lecture at the conference EURO-C in St. Anton am Arlberg, Austria: On finite element modeling of compressive failure in brittle materials

Modeling of brittle softening materials requires suitable regularization techniques. This has been long recognized for the modeling of cracking, i.e tensile failure, in brittle materials such as for instance concrete. The crack band approach represents the classical method how to address this problem of proper energy dissipation in the modeling of the tensile failure in the finite element calculation. The paper presents the straightforward extension of this approach for the modeling of compressive failure in brittle materials. This approach was first used in Červenka, et. al. 1998, but more rigorous treatment is necessary and is the subject of this paper.

If you are interested in full text version, please contact us at cervenka@cervenka.cz.

Meet Us

June 16-18, 2014
International Conference Analytical Models and New Concepts in Concrete and Masonry Structures
Wroclaw, Poland
Event website

July 21-23, 2014
fib International PhD Symposium
Quebec, Canada
Event website

July 24-25, 2014
2nd Fibre Reinforced Concrete International Workshop (1st ACI–fib Joint Workshop)
Montreal, Canada
Event website

September 2-5, 2014
The Twelfth International Conference on Computational Structures Technology
Napoli, Italia
Event website

October 1-2, 2014
Central European Congress on Concrete Engineering 2014
Liberec, ČR
Event website

October 26-30, 2014
ACI International Convention, Fall 2014
Washington DC, USA
Event website

November 16-19, 2014
IALCCE 2014
Tokyo, Japan
Event website

November 26-27, 2014
Concrete Days 2014
Hradec Králové, ČR
Event website

Recent Articles

ČERVENKA, J., ČERVENKA, V., LASERNA S., On finite element modelling of compressive failure in brittle materials, Euro-C 2014, St. Anton, Austria

ČERVENKA, V., ČERVENKA, J., Nachweis der Traghaehighkeit von Bruecken durch numerische Simulation, 24. Dresdner Brueckenbausimposium, 10/11. March, 2014 Technische Universitaet Dresden, ISSN 1613-1169, ISBN 978-3-86780-369-4, pp. 159-172.

PRYL, D., MIKOLÁŠKOVÁ, J., PUKL, R., Modelling Fatigue Damage of Concrete, Key Engineering Materials, (2014) Vols. 577-578, pp. 385-388, ISSN: 1662-9795

ČERVENKA, V., ČERVENKA, J., JENDELE, L.,  ŠMILAUER, V., ATENA simulation of crack propagation in CONCRACK benchmark, European Journal of Environmental and Civil Engineering, 2014, DOI: 10.1080/19648189.2014.881757

PUKL, R., ATENA - an engineering tool for advanced modelling of concrete structure, Conference Modelling in Mechanics, Ostrava, February 2014

ČERVENKA, V., JANDA, Z., Modeling for the Assessment, Maintenance and Rehabilitation of Aging Infrastructure, Ernst & Sohn Special, October 2013

ČERVENKA, J., ČERVENKA, V., PRYL, D., Únavové posouzení kotvení větrných elektráren z vysokopevnostního betonu (Fatigue Assessment of Grouted Connections From High-Strength Concrete in Offshore Wind Power Plants), Sborník ke konferenci 20. Betonářské dny (2013), Hradec Králové, pp. 142-147, Česká betonářská společnost, ISBN 978-80-87158-34-0 / 978-80-87158-35-7 (CD)

PRYL, D., ŠIMONOVÁ, H., PUKL, R., KERŠNER, Z., ČERVENKA, J., SEITL, S., Odezva betonových trámců na cyklické zatěžování: numerické modelování a testy (Response of Concrete Beams Under Cyclic Loading: Numerical Modeling and Tests). Sborník ke konferenci 20. Betonářské dny (2013), Hradec Králové, pp. 440-443, Česká betonářská společnost, 2013, ISBN 978-80-87158-34-0 / 978-80-87158-35-7 (CD)

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