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| Newsletter November 2019|
| 글쓴이 : 관리자
날짜 : 19-11-22 14:33
Dear colleagues and friends of ATENA
we would to share with you the news in our ATENA software and our plans for
the coming year 2020.
the latest development in modelling and simulation of reinforced concrete
structures to your desk. In the last years we have experienced a tremendous
growth in terms of projects, number or employees and software sales.
Currently we have 29 people working with us on ATENA development and
consulting and research projects. This year we are experiencing a record
revenue from software sales with yearly growth of about 37%.
newsletter, we would like to point out some of the most interesting and new
features in ATENA software as well as give you an idea of our new
development and the new ATENA features we are preparing for you. In this
issue, we are focusing on the durability modelling features in ATENA, which
were developed 2 years ago and have been further developed in the latest
It became a
tradition in our newsletter to share a success story how ATENA helped one
of you to complete an interesting project or a paper.
In the last
part of our newsletter, you can learn about the new technical papers on
ATENA technology, and we would like to invite you to our training seminars
in Prague as well as to the conferences next year, where we plan to
participate with a scientific paper or ATENA exhibition. You are cordially
welcome to meet us there, talk about your projects and see how ATENA can
help you to better undestand the structures you are working on.
forward to cooperating with you or seeing you somewhere around the globe.
The world seems to be surprisingly small sometimes :-).
regards from Prague
Your ATENA team
New Features in the latest versions of
ATENA in the cloud
In the past year, the ATENA cloud has been further improved and developed.
It provides two main functionalities:
it can be used to execute all ATENA software tools on-line using a
dedicated computer on the Google cloud. Free temporary account is available
to first time ATENA users for testing and evaluating the software. Just go
to “atenacloud/cervenka.cz” to obtain a free account and test the unique
ATENA reinforced concrete simulation software.
(2) it can be also used for running large scale analysis
by renting a computer with larger memory capacity or higher speed.
Fig. 1: Example of ATENA analysis on
Fig. 2: Application of ATENA
durability model for the corrosion and service life analysis of a
cantilevered bridge structure
the third application is for running parametric studies or
probabilistic simulations from SARA Studio. In this case, a user can submit
a zip file containing several ATENA input files generated by SARA Studio or
other application. A dedicated virtual computer is created for each
analysis, and the nonlinear analysis by ATENA is executed remotely. In this
way all necessary analyses can be run simultaneously with huge time
Models for durability and reinforcement corrosion
durability feature has been further improved and developed. ATENA can be
used to evaluate the durability of reinforced concrete structures during
its service life. In this durability model, the environmental conditions
can be specified as a new boundary condition. This typically includes chloride
concentration, CO2 content or relative humidity. Based on this information
and the distance of reinforcement to this surface, the chloride or
carbonation propagation is calculated in time taking into account the
possible presence of cracks. When the propagation front reaches
reinforcement, the corrosion model is activated, which results in the
reduction of reinforcement area. This effect can be included in any
reliability or strength assessment in ATENA calculation as shown for
instance in Fig. 2.
Durability modeling - Alkali-silica-reaction in
Alkali-silica reaction (ASR) is a reaction in concrete between alkali
hydroxides and reactive siliceous aggregates. This process causes the
development of expansion strain in concrete, which may cause secondary
cracking and can significantly reduce the concrete strength. ATENA models
now cover the most important aspects of durability of reinforced concrete
structures such as chloride and carbonation process, reinforcement
corrosion and ASR. The durability features are all available since version
5.7, and were developed in the DURACERV funded by Czech Technological
Agency under the project #TA04031458.
functionality has been further developed and improved. It can be used to
simulate geotechnical problems (Fig. 3.), bridge construction or general
repair or strengthening approaches.
Fig. 3: Construction process
modelling from GeoProduction 4.0 project
Fig. 4: Evaluation of moment and
shear force diagrams in a nonlinear analysis of continuous reinforced
Improvements in the run-time and post-processor
program ATENA Studio
is one of the most popular tools in the ATENA simulation system. It allows
runtime visualization of the analysis process as well as full
post-processing capabilities even while the analysis is still running and
the iterative process is not yet completed. This very useful insight into
the iterative process helps to discover any modeling errors and gives
useful hints how to eliminate any divergence problems. One of the most
useful features for engineers is also the possibility to evaluate the
distribution of the classical engineering quantities such as moments or
shear forces as shown in the example in Fig. 4.
software tool can be used to test the behavior of individual material
models in ATENA or for testing and debugging user defined material models. This
tool allows to test the behavior of ATENA compatible material models under
arbitrary loading paths. It support loading by both strain or stress
increments or any combination thereof. The resulting stress-strain curves
are plotted in 2D graphs thus allowing clear and easy verification or
understanding of the model behavior. The program also provides the actual
values of any state variables associated with the tested material.
Currently the driver supports only material models for stress analysis.
Fig. 5: Screen shot of the new ATENA
material driver for testing and understanding of material models
ATENA Success Stories
Structural assessment of bridge
columns with engineered cementitious composites and Cu-Al-Mn superelastic
F. Hosseini, B. Gencturk, S. Lahpour and D. Ibague Gil
Department of Civil and Environmental Engineering, University of Houston,
work was about enhancing damage tolerance of bridge columns using high
performance materials. A new design concept was introduced using engineered
contentious composite (ECC) and superelastic alloys and the specimens were
tested under incremental cyclic loads. It was found that the design concept
successfully can reduce the permanent deformation in bridge columns and
enhance their damage tolerance. Following the experimental work, the tested
specimens were modeled in ATENA.
Fig. 6: Boundary conditions, loading
Fig. 7: Comparison of experimental
and computational load-deformation diagrams: (C) HFA-Tube, (D) HFA-Tube-SEA
dimensional constitutive model was added to the material library of ATENA
to simulate behavior of the superelastic alloys. Additionally, behavior of
ECC simulated by introducing smeared reinforcement to concrete with
adjusted stress-strain curves. The numerical models successfully predicted
the experimental results and the modeling approach was used to develop a
parametric study which is scope of another paper.
Projects started in 2019
Functional POROus cementitious
nanocomposites for heat storage in buildings using Phase Change Materials
cooperation with The University of Tokyo, Technischen Universität
Darmstadt, National Institute of Material Science , Spanish National Research Council-Centre for Materials
Physics, GrapheneTech and Röser Ingenieurbeton.
Fig. 8: Schematic impression of the
functional PoroPCM nanocomposite for energy efficient and heat adaptive
Fig. 9: Indicative simulation of
PoroPCM versus a general EPS insulation layer
multifunctional Phase Change Materials modified porous cementitious
nanocomposite (PoroPCM) that can be used for storing large amounts of heat
energy in the insulation layer of buildings is the main aim of joint
synergetic Japan-EU consortium. With this project, partners have the
ambition to develop an innovative functional material that combines high
conductivity, high insulation capabilities, and high storage capacities
within one highly porous cementitious system.
smart technology will encompass a multiscale experimental and numerical
approach which covers advanced nanotechnology-based solutions to a
full-scale demonstration project. The consortium partners, consisting of
excellent universities, research institutes and ambitious SME companies,
have the strong ambition to build this new technology in a joint
international framework while supporting sustainable and multilateral
research cooperation and promoting transnational mobilities between Japan
and the European partners through:
development of the PoroPCM solution with all consortium partners;
research and workshops in both Japan and EU;
demonstration of the PoroPCM product by monitoring its thermal
and partnerships among the consortium partners will be used for future
exchange of students and to enhance the mobilities of researchers with the
aim to develop new research initiatives. The PoroPCM project will create 17
deliverables reporting the activities and research results of all partners
involved, as well as a full-scale demonstration wall, which will provide a
basis for further joint research.
Advanced system for monitoring, diagnosis
and reliability assessment of large-scale concrete infrastructures
Project in cooperation with Brno University of Technology, Czech Republic;
Jiangsu Donghua Testing Technology Co.,Ltd and Hohai University, People´s
Republic of China.
The aim of the
project is to develop a new bridge/infrastructure assessment software
system that will allow to assess performance, reliability and damage based
on health monitoring, data-driven approaches and system identification on
the level of cracks propagation and hence considerably improve prognosis of
bridges reliability. We will deliver an integrated software system both as
a product and as a consulting service.
Fig. 10: Simulation of truck crossing
a pre-damaged bridge, see also video
be based on computational nonlinear modelling of structures and will
include extending modulus for: sensitivity analysis, fractal-based damage
assessment procedure based on cracks pattern evaluation in concrete
structures, surrogate modelling based on polynomial chaos expansion,
dynamic damage identification, reliability and degradation modelling.
Partners: Červenka Consulting, s.r.o. &
developed a software tool to support the design of advanced structures or
products from fiber reinforced concrete (FRC) using simulation prototyping
based on the existing product ATENA. The project developed a
separate module of this system specifically targeted for fibre reinforced
concrete industry. The product shall also support parametric modeling and
embedded script-xing language to enable the fast development of even more
specialized design tools for the development and design of specific
construction products for pre-cast industry or other mass production.
Fig. 11: Parametric modelling in the
new ATENA Studio Pre-processor developed by FibreLAB project
Fig. 12: Parametric model of tramline
on a viaduct calculation with ATENA
Fig. 13: Running analysis and
visualization of cracks in ATENA Studio
ATENA Advanced User Seminar 2020
Dear users of ATENA software,
we would like to invite you to our ATENA Advanced User Seminar 2020.
The seminar will take place in Prague, the Czech Republic on February 10-12 in
Czech language and June 10-12, 2020 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 hands-on 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 in-depth explanation
or background information:
of new ATENA version 5.7.
contact problems in ATENA.
strengthening of reinforced concrete structures.
of construction process in ATENA for bridges and tunnels.
of fiber-reinforced concrete structures.
Where You Can Meet Us
November 20-21, 2019
Hradec Králové, Czech Republic
March 9-10, 2020
March 23-24, 2020
Baustatik – Baupraxis
March 29 - April 2, 2020
April 23-24, 2020
2020, Construction Congress
A.a, AL-MAHAIDI, R., KALFAT, R., CERVENKA, J.: Finite element
investigation of the fatigue performance of FRP laminates bonded to
concrete (Article), Composite Structures, Volume 208, Elsevier, 15 January
2019, Pages 322-337, ISSN: 02638223, DOI:
AL-SAUDI A., PRYL, D., Modelling of High-cycle Fatigue Crack Growth in
Concrete, 10th International Conference on Fr