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Newsletter May 2020

Introduction to ATENA Latest Development

Benefits of ATENA for Your Daily Work

 

Dear ATENA friends, fans and followers,

we hope you are doing well staying safe with your families and friends in this unstable period.

Despite facing the pandemic problems worldwide now, we strongly hope we will overcome it together and get back to normal quite soon. 

To make your working day happier and easier, we have come up with a few solutions and tools to help you better organize your daily routines and get familiar with the ATENA usage. 

For this reason, we brought ATENA in the cloud right to your desktop because we believe you will appreciate all its features and capabilities unlimitedly at no or minimum charge. You can analyze your structures using the full version and bringing results in quite a reasonable time. For more information, please read the specific section below.

Besides that, we have just released a new ATENA 5.6.1p with various improvements and fixes. The most visible enhancement is a brand new SARA Science working as and add-on tool to our major ATENA Science program enabling you to assess your structures from the reliability point of view using modern probabilistic methods. You can evaluate the new versions if you renew your existing license or use our cloud service.   

For those who wish to work with ATENA more regularly and get to know its new features more deeply, we prepared an online seminar that will be organized 10-12, June 2020 through a webex application. Some users already showed an interest in participating in this online event. Join us too!

We look forward to cooperating with you and meeting you in one of the planed events leater this year. 

With best regards from Prague

Your ATENA team

New Features in the Latest Versions of ATENA Software

New pre-release version of  ATENA 5.7.0f is available for download and testing. It supports the following main improvements and fixes:

Major new developments:

- Improved chloride and carbonation propagation model, which is combined with a reinforcement corrosion model that enables the simulation of structural durability and life-cycle assessment
- Improved Alkali-silica-reaction (ASR) model that supports the simulation of structural degradation and material expansion due to this degradation mechanism
- Substepping in the Fracture-plastic material model enables to obtain more robust results that are less dependent on the load step size
 

 

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Fig. 1: Analysis and post-processing of large scale models is much faster and easier in the new ATENA version as documented on these figures from a pushover analysis of a 18-storey building.

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Fig. 2: Example of a moving load application in ATENA software was used in this bridge analysis for fitting the on-site measurements and model calibration, which was used in subsequent durability analyses as shown in the following Figs. 3,4 and 5

- Improved support for using 1D beam and shell elements and their connection to solid or other 3D beam or shell elements
- Increased analysis and post-processing speed for large scale problems

- New material for fibre reinforced concrete based on the "Added Fracture Energy" approach by Peter Karoly Juhasz
- New Material Driver utility for debugging user material models, especially with a UserMaterialDLL. This utility can be also used for studying the behavior of existing ATENA models under various loading paths

- Rayleigh damping definition by regression fitting based on eigen-mode frequencies and mode based damping ratios


Minor improvements or bug fixes:

- Improved support for line load orientation in local direction
- Improved interpolation of imported temperature in time (Creep)
- Smaller fixes in ATENA Studio (drawing IPs, reading old projects, corrected problems with analysis restart or switching between Runtime and Post, saving views + view styles)
- Fixes related to bar orientation display in ATENA Engineering 3D (bond definition)
- New version of SARA Science (RLACS) which supports probability analysis in ATENA Science
- New ATENA-GiD scripts to support the new features in GiD preprocessor
- New GiD version 14.0.4 included in the installation

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Fig. 3: ATENA durability models were used to make prognosis of the future development of the structural load carrying capacity, approximately 100 years life span was predicted for this bridge in Germany

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Fig. 4: This figure shows the prognosis of load-displacement curves changes in the future due to reinforcement corrosion, the peak loads are plotted in the previous Fig. 3 to demonstrate the development of the bridge capacity in time

We are releasing also a new official version ATENA 5.6.1p, which includes mainly various problem corrections in the previous official versions:

- Updated Engineering 3D GUEs (redraw after meshing, best iteration option, decimal digits for aggregate size and in crack filter in Runtime, cyclic reinforcement default parameters + other small fixes and improvements)

- Improved interpolation of imported temperature in time (Creep)

- Fixed the compression-only option for cyclic reinforcement

- Smaller fixes in ATENA Studio (eigenshapes sorting, evolutions/vectors/tensors & activities, cuts, cracks in 2D, display and activities and crashes at analysis restart/switch from&to turbo&post, animation, drawing IPs, reading old projects, saving views + view styles) 

 

- Updated SARA Science to support the probabilistic analysis also in ATENA Science version

- Updated ATENA-GiD scripts fixing some problems in ATENA-GiD interface

- New GiD version 14.0.4 included in the installation

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Fig. 5: Durability model allows the evaluation of reinforcement corrosion after 100 years as shown on this analysis of a bridge in Germany

ATENA in the Cloud

 

As many of you might be working from home now, we think you may appreciate our offer to provide you with ATENA in the cloud. You can make use of our software with full capabilities and without any performance limitations. ATENA cloud is open to anyone, who wants to test ATENA or run a nonlinear analysis on a cloud. Each first time user receives an initial credit of $25 valid for about 5 hours of computer time.

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Fig. 6: Welcome screen on ATENA cloud providing a quick access to tutorials, documentation and available ATENA software

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Fig. 7: All the ATENA applications are available with the identical user interface, such as for instance the classical ATENA 2D Engineering

For this pandemic situation we are providing a special offer to existing ATENA users with reduced cost, when the initial free credit is good for about 25 hours of computer time. Also the computer cost for any subsequent purchased credits is reduced to only cover the fundamental costs of the cloud computers. Many of our customers, who have tried this cloud service already, have been very satisfied with the level of its usability. They were able to analyze their structure within a short time and without the need to installing the software license on their computers.

If you are interested to learn more about this service or you seek to activate your cloud account, please kindly click here.

Our hotline support is prepared to help you with any request you may have on a daily basis.

ATENA Success Stories

Model Uncertainties in Numerical Simulations of Reinforced Concrete Structures

Červenka, V., Červenka, J., Kadlec, L., 7/2018, Structural Concrete, doi:10.1002/suco.201700287

A beautiful award has been received by our founder Vladimír Červenka, whose paper on handling uncertainty issues in reinforced concrete structures modelling has been recognized as one of the most read in Structural Concrete magazine.
For more information about this paper, you may contact us at cervenka@cervenka.cz.

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Fig. 8: Acknowledgement for the most read paper in Structural Concrete journal

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Fig. 9: SPEAD strengthened specimen at the peak load of the as-built specimen (36.5 kN)

Numerical Evaluation of the Steel Plate Energy Absorption Device (SPEAD) for Seismic Strengthening of RC Frame Structures

Santarsiero G., Manfredi V., Masi A., 4/2020, International Journal of Civil Engineering, doi: 10.1007/s40999-020-00510-x

In this paper the Steel Plate Energy Absorption Device (SPEAD) system, devoted to increase the seismic capacity existing RC frames applicable only from outside, is proposed. The device has been developed and virtually tested on a beam-column joint by numerical simulations made with ATENA software package.

The effectiveness of the strengthening solution has been demonstrated by means of both increased lateral load carrying capacity and ductility. SPEAD is a promising intervention technique to obtain seismic upgrading with reduced disruption.

New R&D Projects Starting in 2020

NRG-STORAGE

Integrated Porous Cementitious Nanocomposites in Non-Residential Building Envelopes for Green Active/Passive Energy Storage

Coordinator of this project is Technische Universität Darmstadt. Červenka Consulting is one of next 12 partners from Europe and Argentina.

The main objective of the project is to develop and demonstrate a novel ultra-light cementitious and non-flammable insulation material that includes Phase Change Materials for both active/passive energy storage in non-residential buildings.

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Fig. 10: Schematic representation of the first four stages of the NRG-STORAGE project.

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Fig. 11: Illustration of the overall EU building stock (source: BPIE, 2011).

The NRG-STORAGE project will ultimately contribute to the vast growing market of building envelopes, for both retrofitting and newly built objects, by implementing the TRL levels 5 to 7 of a next generation of prefabricated insulation material, called NRG-Foam. The proposed product will have more than 25% improved insulation capacity, more than 10% higher energy-storage capacity, at least 10% higher water and air tightness, and less than 15% cost increase than the actual solutions based on synthetic materials, glass fibres or stone wools.

Uncertainty Modelling in Safety Formats of Concrete Structures

 

In this project we are cooperating with Dr. Miroslav Sykora from Klokner's Institute at Czech Technical University in Prague.

Design assisted by numerical simulations has become a widely used tool in reliability verifications of reinforced concrete structures in response to advances of information technology. It offers a better understanding of structural behaviour and brings economic savings due to improved structural performance. This is relevant for situations not covered by simplified engineering methods such as for large and complex structures with multiple failure modes.

The project provides missing scientific information related to probabilistic description of basic variables, random fields, structural model uncertainties, and appropriate safety formats.

The limits for using simplified verifications based on numerical simulations will be investigated to establish the scope of their application.

Methods in standards and newly proposed approaches will be verified by a fully probabilistic approach.

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Fig. 12: Massive RC slab with embedded girders Global Assessment of ULS

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Fig. 13: Global safety format should include also a suitable evaluation of modelling uncertainty

In cooperation with international research organisations, research outcomes will be utilised in Eurocodes for structural design, and in documents of fib and of the Joint Committee on Structural Safety.

The goals of the project are:

  • Improvements of probabilistic description of basic variables including spatial variability for reinforced concrete structures.
  • Specification of model uncertainty characteristics for non-linear finite element methods.
  • Safety formats for design and assessment assisted by numerical simulations.

CeSTaR 2

Červenka Consulting s.r.o. in cooperation with National Taiwan University, Czech Technical University in Prague, National Center for Research on Earthquake Engineering, National Applied Research Laboratories, Taipei and Ruentex Engineering & Construction Co., Ltd., Taipei.


Extension of ATENA NLFEM program system for simulation of civil engineering structures and structural members made from non-traditional concrete under complex loading conditions.
Software for simulating the behavior of reinforced concrete columns with advanced multi-spiral reinforcement.
Design of experiment using developed software.
Software validation based on experiments.
Optimized design of column transverse reinforcement in terms of cost, emissions and load response requirements.
Simplified relationship design inspired by Model Code 2010 for multi-spiral reinforcement design.
Using two-speed mixing technology to reduce cement consumption in column.
Recommendations for calculation of interaction diagram of columns with multi-spiral reinforcement, comparison with experiment.

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Fig. 14: Column testing in MATS loading machine at NCREE Taipei, Taiwan

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Fig. 15: Results from column ATENA analysis - Principal compressive stresses

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Fig. 16: Results from ATENA analysis - Column reinforcement stress

ATENA On-line Training 2020

Dear users of ATENA software,

due to the limited movement of people around the world, we decided to prepare this year's seminar as on-line training. We would like to invite you to participate to training on June 10-12, 2020.
Based on the feedback from our hotline support, we selected several topics, where we expect that ATENA users could benefit most from more in-depth explanation or background information:

- Overview of new ATENA version 5.7.
- Modeling contact problems in ATENA.
- Modeling strengthening of reinforced concrete structures.
- Modeling of construction process in ATENA for bridges and tunnels.
- Modeling of fiber-reinforced concrete structures.
- ATENA-SARA: probabilistic modelling, reliability analysis.

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In case you have a topic that you would like to learn or disscuss during the seminar, please let us know at cervenka@cervenka.cz. If possible, we will try to incorporate these requirements into an existing program of the training.

Where You Can Meet Us

 

October 25-29, 2020
ACI Fall
Raleigh, NC, USA
Event website
 

November 22-24, 2020
fib Symposium
Shanghai, China
Event website
 

November 26-27, 2020
Concrete Days
Hradec Králové, Czech Republic
Event website

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Recent ATENA Articles

APOSTOLIDI, E., ŠOMODÍKOVÁ, M., STRAUSS, A.,. PUKL, R., LEHKÝ, D., NOVÁK, D.: THE INTERREG “ATCZ190 SAFEBRIDGE” PROJECT on Advanced Analysis of Existing Reinforced and Pre-stressed Concrete Bridges in the AUSTRIA-CZECH REPUBLIC Region. In: Proceedings of Danube Bridges 2019, The 10th International Conference on Bridges in Danube Basin, Vienna, Austria

Červenka, J., Cordes, T., Bergmeister, K., 2020, Stabilitätsanalyse der Spritzbetonsicherung der Kaverne des BBT-Zugangstunnels, Baustatik – Baupraxis 14, © 2020, Universität Stuttgart, ISBN 978-3-00-064639-3, pp. 808-811

NOVÁK, D., LEHKÝ, D., PUKL, R.: Fiber-reinforced Cementitious Composite: Sensitivity Analysis and Parameters Identification, 8-14 December 2019,  31st Assembly of Advanced Material Congress, Orlando, FL, USA, Extended abstract, ISBN: 978-91-88252-23-4,  doi: 10.5185/AMC31

PUKL, R., LEHKÝ, D., LIPOWCZAN, M., NOVÁK, D., 2019, Material Parameters for Computer Analysis of Fibre Reinforced Concrete Structures. In: The 10th International Conference Fibre Concrete 2019 (FC 2019), Prague, Czech Republic, IOP Conf. Series: Materials Science and Engineering, 596 (1), 012008, ISSN 1757-8981 (print), 1757-899X (online), doi: 10.1088/1757-899X/596/1/012008

RIMKUS, A., ČERVENKA, V., GRIBNIAK, V., ČERVENKA, J.: Uncertainty of the smeared crack model applied to RC beams. Engineering Fracture Mechanics, Paper ID: 107088. DOI: 10.1016/j.engfracmech.2020.107088. ISSN: 0013-7944

SANTARSIERO, G., MANFREDI, V., MASI A.: Numerical Evaluation of the Steel Plate Energy Absorption Device (SPEAD) for Seismic Strengthening of RC Frame Structures, © Iran University of Science and Technology 2020, International Journal of Civil Engineering, doi: 10.1007/s40999-020-00510-x

ŠMEJKAL, F., PUKL, R., ČERVENKA, J.: Fully Stochastic Nonlinear Analysis of Slender Reinforced Concrete Column. Transactions of the VŠB - Technical University of Ostrava, Civil Engineering Series 2019(2), doi: 10.35181/tces-2019-00xx

TAMBUSAY, A., SUPROBO, P.: Predicting the Flexural Response of a Reinforced Concrete Beam using the Fracture-Plastic Model, 12/2019, ResearchGate, doi: 10.12962/j20861206.v34i2.6470

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