Novità di IDEA Statica 7.0

Release note IDEA Statica 7.0

IDEA Statica Steel

Version 7 is the next chapter in reinventing steel connection design. It comes one year after the previous version 6 and brings many new features and improvements. Majority of them were inspired by our users, resellers and partners.

Highlights

  • Stiffness and deformation capacity
  • Base plates, anchors
  • Stiffening members
  • General contacts between plates
  • SAP2000 - new FEA link

Improvements

  • Model of welds
  • Tekla/ Advance steel links
  • Report – one line content
  • Dxf pictures
  • Loads – export to Excel
  • Simplifications – setups, ribbons, report

Stiffness and deformation capacity

Version 7 provides a new function which analyses the stiffness and capacity of a connection of any member in the joint. Complete diagram is generated automatically, is directly displayed in GUI and can be added into the output report. Rotational or axial stiffness can be studied for specific design load. IDEA StatiCa Connection can also deal with the influence of other internal forces.

Diagram shows:

  • Level of design load 
  • Limit value of capacity of conncetion for 5% equivalent strain
  • Limit valure of capacity of connected member (useful also for seismic design)
  • 2/3 of limit capacity for calculation of initial stiffness
  • Value of initial stiffness
  • Limits for the classification of conncetion - rigid and pinned

Base plate, anchoring

V7 offers the option to input different offsets of concrete block on different edges of steel base plate. Offsets influence the calculation of the size of break-out cones. 

End of anchors are frequently modified to increase the cohesion and make break-out cone bigger. However in checks it is involved only in the size of break-out cone. User can define washers of specific size to make break-out cone bigger. Washer can be rectangular or circular, but both have the same influence to the size of cone.

Stiffening members

Users of IDEA StatiCa Connection can reinforce steel joints with additional plates – stiffeners, ribs, doublers. Segments of hot rolled or cold formed profiles can be used for stiffening in version 7. These stiffening members behave in the joint the same way as basic steel members – all manufacturing operations can be applied on them. Stiffening members cannot take loads. They are not a part of 3D global model of the structure.

General contacts between plates

Steel connection is modelled like a system of plates (members are composed from plates), welds, bolts and contacts. Contacts appear in places where two plates are in touch. They take 100% of the pressure but do not act in tension at all. Contacts are automatically generated in between plates which are a part of bolted connection. Version 7 brings an option to define the contact between any 2 surfaces of plates even if they are not bolted together. A lot of practical technical tasks can be resolved thanks to this new feature.

Link with SAP 2000

SAP2000 is widely-used FEA structural software. IDEA StatiCa 7.0 can read all necessary data for design of steel joints from SAP2000 3D models. IDEA StatiCa can read the whole SAP2000 project or only its part. For IDEA StatiCa Connection there is a simplified direct workflow – just select a node in SAP2000, click on a “IDEA Connection” plug-in and design the joint.

Model of welds

Welds are an important part of any steel joint. Version 6 we use the model where weld is modelled like a constrain between edge and surface of plates. Constrain itself does not have material properties. IDEA StatiCa calculates forces in constrains and offer evaluation using 3 methods – maximal/ average/ linear. IDEA StatiCa development team has been working on a much more precise model. Such where welds are also equipped by material properties. It means they can become plastic like all steel plates. This model will provide better results especially for long welds. The effect called “effective length of weld” will be taken into account already in calculated results. Plastic welds will be available once a thorough development and testing process finished but no later than by 1st October 2016.

What was improved for welds already in version 7: The geometry of weld position was rebuilt. The real length of weld is respected in case of different length of welded edges or in case if interruption of welds due to openings. Precise position of welds gives us the chance to improve the presentation of welds. Welds are rendered like in reality when using “solid“ mode. When using “transparent“ mode, only line constrain between edge and surface is shown. This allows to easily check correct implementation of weld. New geometry helped to improve behavior of welds which are close to edge of plate where IDEA StatiCa can give nonsymmetrical results in symmetrical tasks. Thanks to this correction and improvement, the version 7 results can give a bit different results of stress in certain cases.

 Weld results table – new signs for weld type

Import from Tekla Structures and Advance Steel

Both links were released in version 6. IDEA RS fluently improve it and enlarge supported functionality. Now we are able to do also this:

  • Notches – it is possible for both plates of members and stiffening plates. Not for general 3D solid. Welds have to be added in Connection.
  • Openings – we can read all openings in stiffening plates. Not yet in plates of members.
  • Stubs – we can read cuts on both ends, thanks to development of stiffening members.
  • Weld “all around”
  • Bended plates
  • Cuts by CHS – everything is imported, cuts “by surface” have to added manually
  • Anchoring– partially improved, base plate still has to be added in Connection

Report

Output report has key value for the user so we improved its quality in version 7 – style of tables, labels. There is also direct export into MS word – program generates MHT file. We rearranged the “one line” output. There is more useful information which make the output more valuable. It works both for stress/strain and stiffness analysis.

There is a new export of drawings into DXF format in Bill of material. Drawings can be opened directly in Autocad.

Pictures from bill of material into DXF

 

Loads – export into Excel file

New function can be used for copying of load cases between items in the project or between different projects.

Cross-sections

One more cross-section type was added. Angle profile with the possibility to define the angle. It can be applied for stiffening member and used for modelling of bended plates.

Simplified UI

Setup dialog

2 setup dialogs were unified into one, only important values are available.

FEA setup was removed, Colours are moved to Preferences, only one setup dialog is available now.

Original Setup dialog was rearranged and several properties from FEA were added.

 FE results

Settings In nodes / In elements were removed. IDEA StatiCa Connection uses “in elements” for all check CBFEM outputs and “in nodes” for FE results of stress and strain.

 

Report settings

Quite complex settings dialog for detailed report is briefer now. We defined compulsory content of the report and user can play only with limited number of options.

IDEA StatiCa Concrete

IDEA StatiCa Concrete and Prestressing

Bridge Load Rating

Most of unique innovations have been introduced due to the fact that a man is lazy and wants to make his life easier than before. Undoubtedly bridge load rating is laborious hand-iterative process, especially when it comes to reinforced and/or prestressed concrete bridges. The engineer can spend days and weeks trials and errors in the estimation of bridge load-carrying capacity. The problem lies in the determination of load-bearing capacity of cross-section subjected to the combination of normal and shear forces, bending and torsional moments. Due to the different effect of dead and live loads and the non-linear behavior of concrete, the problem becomes non-linear and its solution requires the use of suitable iterative method. That is probably why my friend, excellent bridge engineer and user of IDEA StatiCa, came to me with the request to help him and his colleagues with this tedious task… Optimized iterative solution was implemented into IDEA StatiCa software and it results in new module available in version 7. The new bridge is designed to transmit given load, which is represented by the load models grouped in various load groups. Bridge load rating addresses the problem the other way round, i.e. what load-carrying capacity (the resistance) of existing bridge can be used. It is the opposite process. Therefore bridge load ratings give the information about the needs of maintenance, the retrofitting or replacement of bridge elements. They’re also essential for assessing applications for overload permits.

Bridge load rating is the calculation to determine the safe live load carrying capacity of the bridge. Due to the facts that load schemes usually differ from traffic loads defined in design codes and materials possibly suffer from the deterioration, different partial safety factors of materials and loads and different combination factors are used.

Benchmark example

A load rating benchmark example was performed on a simply supported KA61 prestressed concrete side-by-side box-beam bridge with a span length equal to 12m and with the cross section shown above.

The analysis of moving loads on the bridge beams has been performed in software SCIA Engineer. Based on this analysis, the critical effect of moving loads on particular bridge beam was identified and internal forces in critical moving load cases were exported into IDEA StatiCa. Structural model of bridge beam was created in IDEA Beam application including the design of tendon and reinforcement.

Combinations for bridge load rating analysis are generated automatically based on the bridge load groups. Program runs automatic iterative calculation respecting the settings of the analysis. Results of analysis appear automatically after the calculation. Results of analysis are presented as summary for critical checks and sections, and also for particular type of load bearing capacity of bridge load rating analysis – Vn – normal. Vr – reserved, Ve – exceptional.

In-plane restraint of out-of-plane flexure

With the new version we prevent the deformation of assimetrical cross section due to rotation to its principal axis. Infact this would form out-of-plane flexure (displacement in the direction of local Y axis and rotation about X and Z axes).

Results of structural analysis (TDA)

Deformation of the beam due to the self-weight in stage Storage yard (Supports at the ends).

Deformation in stage Final supports due to uniform load -10kN/m

  • Only deformation uz
  • Deformation uy and rotation jx is fixed

 

Results in RCS – check of sections

Settings in Construction stages in RCS mirror the settings in the Beam module.

The effects of extreme internal forces calculated in stage Storage yard:

 

  • o 3D bending
  • o rotation rx is jz are not zero

Out-of-plane flexure is prevented starting from this construction stage. Therefore the assessments of cross-section disregard any increments of moment Mz, which appear since that construction stage. Of course that total effects can result in out-of-plane flexure, which appeared in the increments before in-plane restraint was applied.

  • o 3D bending
  • o increment of jz is zero
  • o 3D bending
  • o increment of jz is zero

 

Relaxation tables

The total relaxation of prestressing steel at infinite time and the development of the relaxation loss over time have often been provided by the producer of the prestressing reinforcement in the form of what is called relaxation tables. And we had always worked with relaxation tables in our professional life before Eurocode introduced a formula instead. It seemed to be a big progress – easy programing, easy work. The problem is that the formula does not fit the real behaviour of prestressing reinforcement manufactured by different producers. That is also why the use of that simple formula is not allowed in Germany. And that is why we introduced user-defined relaxation tables into IDEA StatiCa version 7.

Generator of bridge combinations in BIM

Users of IDEA StatiCa praised the generator of bridge combinations, which was implemented in IDEA StatiCa Beam in version 6. They said repeatedly that it is better than in programs of our competitors. That is why they asked for the implementation of the generator into BIM module so that they can use it after they import the results of load cases from linked 3D programs.

That is why the possibility to define bridge load groups and to generate load combinations was implemented into IDEA StatiCa software in version 7. Above that the combinations can be exported into Midas Civil via mct file.

Liquid retaining and containment structures - improvements

The check of cracks according to EN 1992-3 is improved so that the program determines automatically if the depths of concrete compression zone from opposite sides overlap each other or not. This happens in the case that the cross-section is loaded from both sides (alternately for different combinations).

RCS - possibility to check one extreme of the section only

Stiffness - improvements

New possibilities to calculate the stiffness and curvatures of prestressed cross-sections was introduced in version 7- Both short-term and long-term stiffness can be calculated. Curvatures caused by the shrinkage can also be calculated.

Link to SAP 2000

Simplified UI of RCS

New user interface is optimized to be more intuitive and simple. The Navigator bar was reduced to provide basic program function and the Checks are accessible via Result command.

 

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