Dear ATENA friends,
the new version of ATENA software is available right now and brings you many new exciting features:
(a) improved robustness and validation of ATENA for seismic and dynamic analyses (b) support for the new Austrian tunnelling method (c) improved 3D beam elements for efficient modelling of large scale high rise building frames (d) improvements in highcycle fatigue model for concrete in tension (e) support for parametric definitions in ATENA input/command file (f) new extrude option enables pure brick meshes in extruded regions in ATENA 3D (g) probabilistic module SARA/RLACS available also for ATENA Science (h) plus many other improvements, corrections and bug fixes in ATENA 2D/3D, GiD Interface, ATENA Science and ATENA Studio.
The users with valid ATENA maintenance agreement are entitled to get the new ATENA version 5.3 for free. The recommended way is to run the ATENA Update Check utility. If your maintenance has expired, please contact us at cervenka@cervenka.cz for an upgrade quotation. 
(a) Improved robustness and validation of ATENA software for seismic and dynamic analyses. The dynamic capabilities of the new ATENA version has been tested to improve the program efficiency and robustness for analysing seismic problems. ATENA can be used now to perform static pushover analysis as well as subjecting the structure to the ground motion and evaluate its behaviour under this complex scenario using all available nonlinear models for concrete, masonry, steel or interfaces. The Fig.1 shows the program response in the two storey building experiment performed at ISPRA during the ESECMaSE project. See video here. 
Fig.1: Simulation of seismic experiment in ISPRA laboratories

Fig.2: Simple example of tunnel construction process modelling in ATENA Science

(b) Support for the new Austrian tunnelling method is included in ATENA Science now. The user can define the activation or removal of parts the structural model to simulate the various construction cases. The redistribution of the forces between the removed parts and the new ones can be controlled through user defined parameters. 
(c) Improved 3D beam elements increase the program efficiency in handling large scale models of multistorey frame structures such as high rise buildings. The 3D beam elements can be used in combination with shell and/or solid elements to create efficient models for large scale analysis of frame structures. In the ideal approach, the bending elements are modelled using these special beam or plate/shell elements. The beamcolumn joints where shear failure mode can be expected should be modelled using solid elements. Similar modelling approach can be also used at the columnplate connections, where the punching failure mode should be verified by a finer model with solid elements (Fig. 3). The ATENA beam and shell elements can be easily combined with solid elements such that the most comprehensive, accurate and efficient approach could be use for checking your structures. 
Fig.3: Example of building analysis in new ATENA using the combination of the new 3D beam elements with 3D shell and solid elements

Fig.4: Example fatigue analysis from project at Swinburne University of Technology by Mr. Atheer AlSaoudi (Investigation of the Performance of FRP Anchorage Devices in RC Bridge Beams Subjected to Fatigue Loading)

(d) Improvements in ATENA fatigue model for effective simulation of high cycle fatigue of concrete in tension. This fatigue model has been further improved to increase its robustness. The basic idea of this model is to simulate the effect of highcycle fatigue, but using only a limited number of cycles. The model of your structure is subjected to several load cycles. Each cycle effectively represents several hundred or thousands of cycles, and the corresponding damage is calculated based on this information. This unique approach enables efficient evaluation of the fatigue damage as well as the damage distribution during the loading process. Have a look for yourself at Fig.4, how this fatigue model was used to analyse the fatigue strength of a carbon fibre sheet connection to concrete. 
(e) Parametric definitions are now supported in the input/command file. In the new version of ATENA, it is possible to introduce mathematical operations, define and assign values to variables. This can be effectively used for batch processing and parametric definition of the numerical models for various parametric studies. See Fig.5 for a glimpse of the new parametric input in ATENA command file. 
Fig.5: Example of parametric definition of material properties and structure geometry in ATENA input file

Fig.6: The right part of the figure shows the hexahedral mesh using the new extrude option in ATENA v5.3, the left part shows the tetrahedral mesh in previous ATENA version

(f) Extrude meshing option in ATENA 3D. This very interesting new feature in ATENA 3D extends the type of macroelements/regions for which brick elements (hexahedra) can be used. Any macroelement, which contains two opposite topologically identical surfaces, can be automatically meshed with brick (hexahedra) elements, which simplifies the modelling and increases the accuracy. Such macroelements/regions are for instance typically created by the extrude operation (See Fig.6).
(g) Probabilistic module SARA/RLACS is available now also for ATENA Science. Any value in the ATENA input/command file can be selected for randomization. The advanced probabilistic methods of FREET such as LHS, FORM, correlation matrix, simulated annealing can be used to perform accurate reliability prediction using the elite nonlinear models of ATENA. This totally new module is documented on the Fig.7 showing the full probabilistic evaluation of the design strength of a longspan (18 m) reinforced concrete girders with large openings. 
Fig.7: Load displacement diagrams obtained by calculations in program RLACS and ATENA

Fig.8: Lognormal distribution for load capacities obtained by probabilistic study

Last but not least, ATENA version 5.3 was used to calculate the winning predictions of the Toronto shear beam experiment (see the video here).
Run ATENA Update Check utility and see whether you are entitled to get the new ATENA version 5.3 for free.
In case you have not updated your HASP for the new ATENA version 5 yet, you can find the instructions here.
We hope that this new version of ATENA software will help you in your current and future work and we look forward to hearing from you soon!
Your Červenka Consulting ATENA Team www.cervenka.cz 
