Structural Analysis of Steel Halls

Steel Halls in Dlubal Software Programs

26 May 2014

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RFEM and RSTAB allow for continuous structural planning of halls consisting of steel. Both programs provide powerful tools that can be used to create, load and design steel halls easily.

2D hall frames or complete 3D halls including loading are automatically generated after entering the parameters in the corresponding model generators. Then, the ultimate limit state design, the stability analysis as well as the serviceability limit state design are performed by the respective add-on modules which are available, for example, for Eurocode 3, the Swiss Standard SIA 263 or the American Standard ANSI/AISC 360-05.

The design of connections according to Eurocode is possible, too. You can calculate for example frame joints with or without tapers as well as hinged or rigid column footings. If the layout of foundations is also part of the performance, you can design also them according to Eurocode (EC 2 and EC 7).

Hall Generators / Wind and Snow Load Generators

In the hall generators, you enter the required parameters one after the other, such as geometry and cross-sectional data as well as the loading that you want to apply. The generators even help you with the data entry for snow and wind loads. The loading is created automatically according to the selected standard depending on the snow or wind load zone, altitude, etc.

If the hall structure is not entered by means of a generator but manually in the 3D model mode, RFEM and RSTAB provide separate wind and snow load generators.

Then, after entering the required parameters, the wind and snow loads are created automatically for 3D models with a flat/monopitch or duopitch roof. The wind loads are applied in accordance with the zones defined in the respective standard (for example EN 1991-1-4). In the snow load generator, you can also consider a snowguard or a snow overhang.

Automatic Creation of Combinations

Once the model and loads are created, the load and result combinations can be generated automatically in RFEM/RSTAB according to the design situations of the respective standard. You can choose among EC 0, SIA 260 (Switzerland), ACI 318-08 (USA) and many other international standards. If the combinations are done according to Eurocode, the German National Annex is available in addition to 16 other annexes like that of Austria, France and Italy.

Design According to EC 3 and Other International Standards

In RF-/STEEL EC3, the design can be carried out according to Eurocode 3. Ten more add-on modules are available for other international standards, for example for the steel construction standards of Switzerland, USA, Canada, Russia, South Africa, etc.

All design modules allow you to analyze the structure's stability in addition to its load bearing capacity and serviceability (for EC 3 also fire resistance). The analysis is performed for members with simple or combined action effects due to compression, bending and shear. It is also possible to define lateral supports for beams.

A classification of the individual cross-sections is done automatically in all add-on modules. A large variety of cross-sections like I-sections, channels, tees, angles or hollow sections is available for selection. If necessary, you can optimize them during the calculation.

Clearly-arranged tables show the design results in detail. Furthermore, it is possible to visualize the results graphically in RFEM/RSTAB.

Connection Design According to EC 3

With RF-/FRAME-JOINT Pro you can design bending-resistant, bolted connections of columns and horizontal beams according to Eurocode 3. In this way, the program helps you lay out and classify, among other connections, the frame joints for leg members as well as intermediate columns. In addition, you can reinforce the connections with stiffeners, web and backing plates. It is also possible to arrange tapers of horizontal beams.

The design of connections is performed for positive and negative moments. Moreover, RF-/FRAME-JOINT Pro checks if the required edge distances and hole spacings are observed, and whether designed connections can be bolted.

Also column footings, whether hinged or restrained, can be designed according to EC 3. The footing's base plate is welded all around the steel column. There are four joint types for hinged footings among which you can choose and five variants for rigid footings. The anchorage is normally ensured by anchors set in concrete. Furthermore, you have the option to use a shear key (cleat) for the shear force transfer. Another design variant for a rigid column base is the column cast in a bucket.

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