Monday, 5 December 2016

New Program Language and EuroCode National Annex in ConSteel and csJoint

With the latest release of ConSteel and csJoint (20161130.150) a new program language and EuroCode National Annex have been published.

Now you are able to use the graphical interface and create report in Croatian language.

Furthermore, not just the Croatian language, but the National Annex was implemented for the following EuroCode sections:
  • EN 1990 EuroCode 0
  • EN 1991 EuroCode 1
  • EN 1992 EuroCode 2
  • EN 1993 EuroCode 3
  • EN 1997 EuroCode 7
  • EN 1998 EuroCode 8

All of the parameters and factors can be checked in the Standard Manager dialog.

Friday, 11 November 2016

Customer Project - Egg shaped office building

Architects BP Străjan
Structural Engineering GORDIAS
Location Alba Iulia, Romania
Built in 2016
Size 5.450 sq m
Material S235

In 2016, a new modern office building was transformed from an old grain warehouse. The old mill and the grain sorting station was demolished, the old warehouses became part of the new building, the central element taking an egg-shape.

The client’s main requirements were the followings:
  • Achieving the required egg shape of the three-story office building at a sophisticated level, from both structural and architectural perspective;
  • To establish an interior space, rich in natural light, which initial destination was agricultural building with no requirement of natural light; 
  • to retain and refurbish the original prefabricated concrete structure in order to maximize the usable office area.

The three-story egg shaped office building area is 1350 m2, while each of the retrained and refurbished two longitudinal office buildings are 2050 m2.

ConSteel software was used to carry out the structural analysis and design, especially the global stability checks. To have an overview about the global behavior of the structure, the whole egg shaped office building was calculated and checked using a full 3D model of the structure, including not just the steel structure, but the whole reinforced concrete building parts.

Thanks to the high level BIM interface, design team was able to devise the erection phases of the steel structure, furthermore to observe and prevent the possible clash problems which would cause delay later in the erection process.

Friday, 14 October 2016

BIM Interface to Tekla 2016

With the new ConSteel 10 SP1 version the complete model exchange is possible to the new Tekla 2016 version also.

Tuesday, 6 September 2016

Customer Project - Ion Oblemenco Stadium

Architects Dico si tiganas
Structural Engineering Plan 31 RO
OptimART Project
Location Craiova, Romania
Built in Under construction
Size 56.900 mp
Members 5.804 members and 14 surfaces
Material S355 and C30/37

In 2017, a completely new, more than 30.000-seat stadium will replace the oldfashined and demolished Ion Oblemenco Stadium.

The future stadium will achieve UEFA category IV (the highest level).

The playing field has standard dimensions of 105m x 68m and consists of a natural grass surface which is heated, irrigated, drained and ventilated. The seating is located close to the playing field over two levels, providing spectators with comfortable seats and optimum visibility. In addition VIP skyboxes are located between the levels of seating around the full perimeter of the bowl.

ConSteel software was used to carry out the structural analysis and design. The 3D model contains almost 6.000 steel and reinforced concrete members and 14 concrete plates. Not just the steel roof structure, but the whole reinforced concrete building part was also modeled to take into account the complex behavior of spatial structure.

Thanks to the high level BIM interface, the complete ConSteel structural model was exported to Tekla Structure for further detailing. In this way, significant time was saved and possible mistakes were avoided.

Wednesday, 24 August 2016

Tips&Tricks - Dlubal RStab and SAP2000 complete model import

The new import function of ConSteel 10 allows you to import complete calculation model from Dlubal Rstab or SAP2000.

This import function can import the calculation model from MS Excel table files, which can be created with the proper export function of Dlubal RStab or SAP2000.

Following model data can be imported to ConSteel:
  • ·         Structural members with end release configurations, rotation and eccentricities
  • ·         Cross sections with cross section parameters
  • ·         Nodal supports with rotation and eccentricities
  • ·         Nodal forces
  • ·         Concentrated forces on members
  • ·         Member forces
  • ·         Load cases

The import functions can be found in the File/Import menu. To start, Dlubal (xlsx) or SAP2000 (xlsx) option has to be chosen.

For the import process, the following settings have to be made:
  • ·         Path of the import xlsx file have to be chosen by clicking on the open button
  • ·         Unit of the original model has to be set (mm/cm/m)
  • ·         Direction of the global Z axis of the original model has to be set, since it may be different in the other software
  • ·         In the tree structure the necessary model contests have to be chosen

After clicking OK button, the import process will start and as the first step of the import, the Section Import Manager dialog, which is handle the section and material conversation, will be appeared. It is possible to modify the identified cross sections and material grades.
After clicking OK button, the imported model will appear in the modeling area and all of the load cases will be created.

Important to know, that the xlsx model export file must be created using English language in the original software.

Thursday, 21 July 2016


Semi-rigid joints in modeling of structures

The effects of the behaviour of the joints on the analysis of the structures should generally be taken into account. To identify whether the effects of joint behaviour on the analysis needs to be taken into account, three simplified joint models are distinguished:
  • Simple (joint may be assumed not to transmit bending moments)
  • continuous (joint may be assumed to have no effect on the analysis
  • semi-continuous (joint needs to be taken into account in the analysis)
The joints should have sufficient strength to transmit the forces and moments acting at the joints resulting from the analysis. A joint may be classified as rigid, pinned or semi-rigid, according to its rotational stiffness, by comparing its initial rotational stiffness Sj,ini with the classification boundaries. A joint which does not meet the criteria for a rigid joint or a pinned joint, should be classified as a semi-rigid joint. Semi-rigid joints provides a predictable degree of interaction between members, based on the design moment-rotation characteristics of the joints.

In the case of a semi-rigid joint, the rotational stiffness Sj corresponding to the bending moment Mjed should generally be used in the analysis. If Mjed does not exceeds 2/3 of Mjrd, the initial rotational stiffness Sj,ini may be taken in the global analysis.

Rules for the determination of Sj,ini for joints connecting H or I sections are given in EC3-1-8 6.3.1. 
Rules for the determination of Sj,ini for joints connecting hollow sections are not given in EC3.

Classification of joint stiffness

ConSteel and csJoint calculates the Sj,ini stiffness for semi-rigid joints with connecting H or I sections. The picture below shows the csJoint interface of a beam-to-beam end plate joint:
1. Value of initial stiffness is Sjini=26375 kNm/rad. This value is equal to 0,848Sb (the measure of         semi-rigidity is 77,5%) where Sb is the boundary value for rigid joint.

2. The moment resistance is Mjrd=33,7 kNm
    The joint is loaded by Myed=40kNm
    The resistance of the cross-section is Mcrd=86,2

3. The moment resistance (Mjrd) is greater than the design bending moment (Myed), but smaller than     the cross-section resistance. Consequently, the joint is partial strength.

Transfer of joint stiffness into the structural model

The stiffness of semi-rigid joints should be taken into consideration in the structural model. For elastic analysis, the stiffness of a joint can be approximated by a linear rotational spring with characteristic Sj,ini placed at the joint.

In ConSteel, spring characteristics can be defined at the end of the bar members.
The spring characteristic is associated with a release object at the end of a member. A release object contains seven spring characteristics (7 Dots Of Freedom). The spring characteristic of a semi-rigid joint corresponds to the qdegree of freedom (in our case, yy means the appropriate degree of freedom)kNm
(stiffness=Sj,ini/h=26375/3=8791kNm EC3-1-8 Table20.)

The spring characteristic can be built into the structural model by an "automatic" way. To do this, the created joint should be Placed at the node where the joint is situated.

The "automatic" procedure has the following steps:
  1. Create the joint by csJoint
  2. Save the joint model and close csJoint
  3. "Place..." the joint model at the appropriate node of the structural model (picture above)
  4. Run structural analysis
  5. Open csJoint and select the joint model
  6. Check the resistance of the joint

In step3 the spring characteristic is built into the structural model. In step 4 the analysis will include the effect of the joint stiffness (unless it was required in the "set analysis parameters" dialog). In step 5 the csJoint reads the design forces in order to check the joint. 

Deflection of the beam without the stiffness of the joint:

Deflection of the beam with the effect of semi-rigidity:

More technical description can be found in ConSteels's user manual

Thursday, 23 June 2016

Tips & Tricks

Freeform structural modeling functions of ConSteel 10

In the last years, freeform architecture became more and more popular. A variety of complex geometric shapes are used for the facades of buildings, which brought the demand of new, innovative tools and solutions for modeling of these structures too.
With ConSteel 10, we have upgraded our already existing, and implemented new functions for the modeling of freeform structures.

1. Section orientation for freeform surface

Orientation of the sections was the first problem to handle. We have implemented a new tool, with which the rotation of the sections can be done automatically. Sections can be rotated perpendicularly to the surface of the freeform shape of the structure.

2. Freeform covering with load transfer surfaces

The second newly implemented tool was the automation of covering the structure with load transfer surfaces. Covering a freeform structure with load transfer surfaces manualy, like in the picture below would take a lot of time and effort. Our new tool for multiple load transfer surface placement gives you a quick, easy and effective solution for covering your freeforms.

3. Local coordinate system setting by point

The third tool is an upgrade of the existing local coordinate system manipulation functions.
Thanks to the new function, direction of the local coordinate systems can be set easily by point. All of the local coordinate axis of a covered freeform structure can be set to point out from the structure with a simple selection of an inner point.

Thanks to the new functions, building up the engineering model of a freeform structure can be a fluent process, on which the analysis and the design can rely on.

Thursday, 16 June 2016

Tips & Tricks

New About Dialog helps to follow up your licence/dongle status

With ConSteel 10, under the Help button of the menu, you can find the new About dialog.

At the top, you can find the build date and number of your ConSteel. Always make sure that you are using the most recent version of ConSteel, what can be found on our website:

On the bottom part you can find important information of your licence.
  • Licence type: 
Depending on your licence it can be Full, Trial, Student, Graduate or Educational version.
  • Protection type:
Depenging on your licence, it can be Softkey, or Dongle type
  • Dongle number:
Gives you the number of your Dongle, which helps you identify it if you have lost your number
  • Expiration date:
Gives you the last day when your Softkey/Dongle is active. In case of Dongles, it is automatically being extended with a security file provided by us
  • Upgrade date:
The day when your maintenance period expires for the softwer. Gives you the last day when you are able to upgrade your ConSteel

For mor information about licencing, please contact us at!