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  • Answer

    The add-on module determines the required reinforcement for the ultimate limit state. The fire resistance design is performed as design based on the determined reinforcement. The reinforcement will not be increased in this process. If the design is not fulfilled, you can either define a higher reinforcement manually or adjust the concrete cover to prevent the applied reinforcement from being damaged too much by the effects of fire.
  • Answer

    In order to carry out a fire resistance design in STEEL EC3, it is necessary to select a load case or a load combination in the dialog 1.1, tab 'Fire protection', for which the fire resistance design is to be carried out.

    As soon as you have selected a load for the fire resistance design, an additional dialog 'Fire protection - Members' or 'Fire protection - Set of members' appears in the module navigator on the left (if sets of members are to be calculated in the module case). In this dialog 1.10 or 1.11, further settings for the fire protection design of the component can be set.

    Further detail settings (e.g. required duration of fire protection, etc.) can also be found by clicking on the [Details ...] button and selecting the 'Fire protection' tab. 

    Further information can also be found in the STEEL EC3 manual.
  • Answer

    In the program, you can enter a final temperature from the steel. This function has been implemented to, for example, use results from real fire events or fire test locations and carry out the analyzes with a more accurate temperature, since the temperature rise is usually divided into several phases in real firing and thus is more favorable for the design.

    For the analysis on the temperature plane, it is shown that the highest temperature that occurs in the structural component is less than the critical steel temperature. The critical steel temperature is the temperature at which the component resistance is just as high as the loading due to mechanical loads.

    This is not a design according to ULS, since no stability analyzes are usually carried out in this case. Therefore, it is possible to use this method for the preliminary design of a structural component by, for example, calculating the critical temperature by means of the degree of utilization of the moment loading. We do not offer this method directly, but you have the possibility to determine a critical temperature of the structural component iteratively by specifying the temperature, but I would recommend to consider the stability analyzes. The determined critical temperature may be smaller than the one of the formulas in the Eurocode, because as usual, no stability analysis is considered.

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First Steps

First steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

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