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Frequently Asked Questions (FAQ)
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AnswerIt is possible that the module determines a high required reinforcement for SLS if it is not possible to fit the provided reinforcement in the cross-section or rather in the reinforcement layer. It is also possible that the deflection analysis leads to high required reinforcement.SolutionIt could be a solution to increase the maximal number of reinforcement layers. With a higher number of reinforcement layers it is possible to provide a higher reinforcement (picture 1).For deflection analysis it could be a solution to disable the automatically increasing of the longitudinal reinforcement for serviceability limit state design and define a minimal reinforcement (picture 2). In combination with other SLS checks it could be useful to calculate the deflection analysis in a separate case.
AnswerThis calculation method is available for 2D positions (see Figure 1)
AnswerThe deduction of the precamber in the serviceability limit state design is actually not regulated in steel structures. However, in response to customer requests, we have adopted the corresponding add-on module according to the timber or concrete add-on module. However, according to the standard specification, this value should only be considered in the quasi-permanent design combination.This does not apply to the characteristic and frequent design situation. Thus, as soon as the design situation in the add-on module is adjusted accordingly (see figure), the applied precamber is also subtracted from the resulting deformation.
AnswerIn the basic information, the rod sets must first be selected so that they can be dimensioned for the corresponding limit states. Thereafter, various requirements for the proof of serviceability can be made in the usability parameters.
AnswerAccording to the specifications of EC2, the steel tension design in the SLS is performed only with the characteristic combination. If no combination of the "characteristic" type is selected, the design is not carried out. There are three ways to counter this:1. Adding an additional combination of the "characteristic" type to the selection of the combinations to be designed.2. Changing the combination type of an already selected combination so that it is regarded as a characteristic combination.3. Modify specification of standard and activate design in detail settings for other combination types (frequent or quasi-permanent).
AnswerTo determine the minimum reinforcement from restraint (drain of hydration heat) in RF-CONCRETE, you have to select at least one load case or CO for design in the "Serviceability Limit State" register of the 1.1 General Data input form. The analytical method of check for the serviceability limit state is activated by default in this tab. See Figure 01.
After activating the checks in the serviceability limit state, you can now adjust their settings in input form 1.3 Surfaces. Switch to the Limit of Crack Widths tab in input form 1.3. On the right side, you'll find the "Minimum Reinforcement for Effects Due to Restraint". Once the box "Crack formation in the first 28 days" has been selected, the factor for controlling fct,eff,As,min can be entered. See Figure 02.
It is only possible to enter concrete covers of individual reinforcement layouts independently if no serviceability limit state design is performed.
As soon as you have selected a load for the serviceability limit state design in Table 1.1 in RF-CONCRETE Surfaces, the reinforcement layouts will be coupled together.
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