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Červenka consulting
Na Hrebenkach 55
15000 Prague 5
Czech Republic
Phone: (+420) 220 610 018
Email: cervenka@cervenka.cz
http: www.cervenka.cz
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Product news

AmQuake


The New Version 1.25 of AmQuake Has Been Released

New features and modifications in version 1.25:

  • new features and result data available in pushover analyses: norm period, max reference ground acceleration...
  • reinforcement cover value used in the automatic generation of the reinforced concrete cross-section
  • improvements in automated finite element model generation
  • new run option: use best iteration method will use iteration with lowest error and automatic step length control. This feature improves the accuracy and stability of the nonlinear analysis
  • new stop options: after ULS and DLS / ULS / Failure
  • enhancement and improvement of the graphical visualization of results
price of AmQuake

ATENA


ATENA Studio

ATENA Studio is our new product, which will be released as a part of the new ATENA version 5 in the next month. The main goal of ATENA Studio is to merge both ATENA product lines - ATENA Science and ATENA Engineering - in one compact environment. Currently ATENA Studio can be used as unified runtime and post-processing environment. It is not necessary any more to use GiD for post-processing in the ATENA Science system. Productivity improvement with the new intuitive interface is going to guide you through all parts of ATENA Studio. Some of the main features are:

  • simple and intuitive user interface (no need to read manuals)
  • new project file - keeps all references to all data relevant to your project
  • fast and fluent work with diagram windows
  • improved result management compared to AtenaWin
  • all postprocessing features are available also during runtime
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AmQuake


Program AmQuake was developed in cooperation between Cervenka Consulting and Wienerberger AG, Vienna. It allows engineers to design safe masonry buildings in seismic regions in accordance with the latest European standards. For more information see www.amquake.eu.
New version of AmQuake

New version of AmQuake

ATENA

  • unified and powerful environment for all analysis types: 2D, 3D, statics, dynamics, creep, heat & moisture transport
Before the ATENA Studio will be released officialy, users with valid maintenance can download the new version 4.3.1g from our website
Intuitive design of ATENA Studio

Intuitive design of ATENA Studio

Simulation of Shrinkage Cracking of a Reinforced Concrete Slab

In practice, engineers often need to design a reinforced concrete foundation slab, when the main design criterion is the crack width limit at the bottom or top surface. ATENA version 5 now includes a comprehensive transport and shrinkage model that provide the necessary answers to engineers. It is possible to calculate the hydration heat, which develops in the structure based on the concrete composition and cement type. More accurate estimation of the shrinkage is possible by coupling the stress analysis with the transport model, which predicts the time dependent drying of the material through its thickness.

Geometry of the reinforced concrete slab

Fig. 1: Geometry of the reinforced concrete slab

Cracking pattern and shrinkage evolution after 100 years

Fig. 2: Cracking pattern and shrinkage evolution after 100 years

Evolution of shrinkage in 100 years

Fig. 3: Evolution of shrinkage in 100 years

Temperature evolution in 50 days

Fig. 4: Temperature evolution in 50 days

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Identification of Material Parameters for Nonlinear Modelling of Fibre Reinforced Concrete Structures


ATENA Software can be successfully used for analysis of behaviour and failure of fibre reinforced concrete (FRC) structures. Crack initiation and development, load carrying capacity and post-critical behaviour of structures, structural parts or experimental specimens can be investigated.
Nonlinear fracture analysis accounting tensile capacity of material enables to exploit reserves, which are usually neglected or diminished in codes or in the linear analysis. Since the tensile behaviour in the FRC is dominating, the potential profit from the nonlinear analysis of FRC-based structures is much higher than in standard reinforced concrete structures.
Constitutive material models in ATENA were adopted for description of tensile properties of the FRC-material. They account for the high toughness and ductility of FRC as well as possible uncertainties and spatial variability of the material properties. Inverse analysis of different types of FRC material tests has been performed and evaluated. Based on the obtained results the optimal material input sets for practical utilization of the different numerical material models of FRC were suggested and applied in design practise.

Scheme of the four-point bending beam testing Finite element model for simulation of four-point bending tests
Fig. 1: Scheme of the four-point bending beam testing Fig. 2: Finite element model for simulation of four-point bending tests
Crack pattern in RC tubing in experiments

Fig. 3: Crack pattern in RC tubing in experiments

Crack pattern in RC tubing in numerical simulation

Fig. 4: Crack pattern in RC tubing in numerical simulation

Comparison of numerically obtained crack patterns at peak load for conventionally reinforced concrete tunnel tubing (left) and fibre reinforced concrete tunnel tubing (right). In the FRC structure the maximum crack width is significantly reduced.

Fig. 5: Comparison of numerically obtained crack patterns at peak load for conventionally reinforced concrete tunnel tubing (left) and fibre reinforced concrete tunnel tubing (right). In the FRC structure, the maximum crack width is significantly reduced.

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Arch Bridge 3D Model in ATENA


As you can see in the header of this newsletter, we had a nice work modelling the new slender arch bridge, which is under construction.

In this part, we would like to show you more pictures from our analysis of this amazing structure.
ATENA software was used to verify the reinforcement and crack width in the end regions of this slender arch bridge.

Arch bridge geometry

Fig. 1: Arch bridge geometry

Numerical model of 1/4 of the bridge

Fig. 2: Numerical model of 1/4 of the bridge

Numerical model of the bridge end regions with longitudinal pre-stressing tendons

Fig. 3: Numerical model of the bridge end regions with longitudinal pre-stressing tendons

Maximal extend of micro-cracking, max. crack width < 0.13 mm

Fig. 4: Maximal extend of micro-cracking, max. crack width less than 0.13 mm

Maximal stress in longitudinal normal reinforcement cca 90 MPa

Fig. 5: Maximal stress in longitudinal normal reinforcement cca 90 MPa

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Eurostars/Eureka Project SE-Lab


Cervenka Consulting has teamed up with the University of Dresden and Leonhardt, Andrä und Partner to develop an innovative virtual laboratory for modern stochastic and non-linear structural analysis methods based on massive simulation with CAD design integration through BIM and the access of public cloud and private grid for mass computing. This development will be supported by the financial funding from the European Eurostars/Eureka program.

SE-Lab is an innovative combination
(1) of sophisticated mathematical methods from computational mechanical and probabilistic engineering
(2) of computer science methods from public cloud and private grid and web-service technologies, and
(3) of construction informatics methods, from Building Information Modelling (BIM), in particular engineering information management, filtering, interoperability, model mapping and model change propagation.


Recent Articles


CERVENKA, J., Modelling of Shear Failure of Deep Concrete Beams - Discrete and Smeared Approach Comparison, Proc. WCCM 2012, Sao Paulo, Brazil, 08. - 13. 07. 2012, ISBN 978-85-86686-69-6, pp. 297

CERVENKA, J., PROSKE, D., KURMANN, D., CERVENKA, V., Pushover Analysis of Nuclear Power Plant Structures, Proc. fib 2012, Stockholm, Sweden, 11. - 14. 06. 2012, ISBN 978-91-980098-1-1, pp. 245 - 248

CERVENKA, J., CERVENKA, V., JANDA, Z., Posouzení bezpečnosti obálek jaderných reaktorů s využitím celkového součinitele bezpečnosti, Energetika 5/2012, ISSN 0375-8842, pp. 250 - 253

HILAR, M., VITEK, J., PUKL, R., Laboratory Testing and Numerical Modelling of SFRC Tunnel, Proc. EETC 2012, Budapest, Hungary, 18. - 21. 09. 2012

JANDA, Z., CERVENKA, J., Posuzování zděných staveb dle Eurokódu 8 na seizmicitu metodou postupného přitěžování, Hradec Králové, Czech Republic, 6/2012, ISSN 1211-6017, pp. 19 - 23

JENDELE, L., ŠMILAUER, V., HLOBIL, M., ČERVENKA, J., Multiscale Hydro-thermo-mechanical Analysis of Hydrating Concrete Structures, Proc. CST 2012, Dubrovnik, Croatia, 04. - 07. 09. 2012

NOVÁK, D., FEKETE, L., PUKL, R., Statistical Analysis of Crack Widths by Virtual Modelling of Reinforced Concrete Beams, Proc. SSCS 2012, Aix-en-Provence, France, 29. 05. - 01. 06. 2012, pp. 75 - 76

NOVÁK, D., PUKL, R., Reliable/reliability Computing for Concrete Structures: Metodology and Software Tools, Proc. REC 2012, Brno, Czech Republic, 13. - 15. 06. 2012, ISBN 978-80-214-4507-9, pp. 427 - 437

NOVÁK, D., PUKL, R., Simulation of Random Behavior of Engineering Structures: From Parameters Identification to Reliability Assessment, Proc. IALCCE 2012, 03. - 06. 10. 2012, Vienna, Austria, ISBN 978-0-415-62126-7, pp. 446

NOVÁK, D., TEPLY, B., PUKL, R., STRAUSS, A., Reliability Assessment of Concrete Bridges, Proc. IABMAS 2012, Stresa, Italy, 08. - 12. 07. 2012, ISBN 978-0-41562124-3, pp. 160

PRYL, D., PUKL, R., ČERVENKA, J., Modeling High-Cycle Fatigue of Concrete Specimens in Three Point Bending, Proc. IALCCE 2012, Vienna, Austria, ISBN 978-0-415-62126-7, pp. 278

PUKL, R., CERVENKA, V., CERVENKA, J., NOVÁK, D., Computer Simulations of Concrete Bridges, Proc. IABMAS 2012, Stresa, Italy, 08. - 12. 07. 2012, ISBN 978-0-41562124-3, pp. 684

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Where You Can Meet Us



Upcoming Events, Exhibitions and Presentations


IALCCE October 03-06, 2012 Austria, Vienna


CCC October 04-06, 2012 Croatia, Plitvice


Probabilistic November 15-16, 2012 Germany, Stuttgart


Slovak Concrete days October 25-26, 2012 Slovak Republic, Bratislava


Czech Concrete days November 21-22, 2012 Czech Republic, Hradec Kralove


BetonTage Ferbuary 07-09, 2013 Germany, Ulm


Framcos March 10-14, 2013 Spain, Toledo


fib April 22-24, 2013 Israel, Tel Aviv


IABSE May 06-08, 2013 Netherlands, Rotterdam


SCCS May 27-29, 2013 Japan, Tokyo


ICOSSAR June 16-20, 2013 United States, New York


SCMT August 19-21, 2013 Japan, Tokyo


CONSEC September 23-25, 2013 China, Nanjing


UHPRFC September 30- October 2, 2013 France, Marseille


NEWSLETTER 2/2012 - OCTOBER www.cervenka.cz