RF-CONCRETE Surfaces Version 5

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RF-CONCRETE Surfaces Version 5

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5.4 Serviceability Design Total

The upper part of the window presents a summary of the governing serviceability limit state designs . The lower part displays the intermediate results of the current FE node or grid point (that is, the entry selected above) including all design-relevant parameters. You can expand or reduce the chapters by clicking and .

Figure 5.6 Window 3.1 Serviceability Design Total

Bild 5.6 shows the results window of an analytical serviceability limit state check. Chapter 5.7 describes the results windows that appear when a nonlinear serviceability limit state calculation is carried out.

The method of check is defined in the Serviceability Limit State tab of the 1.1 General Data window (see Figure 3.8).

Surface No.

This column shows the numbers of the surfaces where the governing points are located.

Point No.

These FE nodes or grid points provide the maximum ratios for the required checks. The type of check is displayed in the Symbol column F.

The FE mesh nodes M are generated automatically. The grid points G can be controlled in RFEM (see chapter 8.12 of the RFEM manual).

Point-Coordinates X/Y/Z

The three columns show the coordinates of the governing FE nodes or grid points.

Loading

Column E displays the load cases , load and result combinations whose internal forces produce the greatest ratio for the respective serviceability limit state design.

Symbol

Column F shows the type of the serviceability limit state design. If you have selected the analytical method, this column will show up to six check types. They are described in chapter 2.6.4 by means of an example.

The symbols stand for the following types of checks:

Table 5.2 Serviceability limit state designs according to analytical method
Type Design of SLS

σc

Limitation of concrete compressive stress ( → chapter 2.6.4.7) according to specifications in the 1.3 Surfaces window (see Figure 3.19)

σs

Limitation of reinforcing steel stress ( → chapter 2.6.4.8) according to specifications in the 1.3 Surfaces window (see Figure 3.18)

as,min

Minimum reinforcement for crack width limitation ( → chapter 2.6.4.9) according to specifications in the 1.3 Surfaces window (see Figure 2.97)

lim ds

Limitation of rebar diameter ( → chapter 2.6.4.10) according to specifications in the 1.4 Reinforcement window (see Figure 3.31)

lim sl

Limitation of rebar spacing ( → chapter 2.6.4.11) according to specifications in the 1.4 Reinforcement window (see Figure 3.31)

wk

Limitation of crack width ( → chapter 2.6.4.12) according to specifications in the 1.3 Surfaces window (see Figure 3.18)

Existing Value

This column displays the values that are governing of all surfaces for the serviceability limit state designs .

Limit Value

The limit values are determined from the standard specifications and the load situation. The determination of limit values is described in chapter 2.6.4.

Ratio

Column J shows the ratio of the existing value (column G) and the limit value (column H). Ratios greater than 1 mean that the design criterion is not satisfied. The length of the colored bar represents graphically the respective design ratio.

For the serviceability limit state design, it is not necessary that all types of verification are fulfilled (see explanation in Figure 3.11).

Note

The final column indicates non-designable situations or notes referring to design issues. The numbers are explained in the status bar.

The button shown on the left allows you to view all [Messages] of the current design case. A dialog box with an overview appears (see Figure 5.3).

The buttons are described in chapter 6.