Advanced Options - Beams

The Advanced Options dialog box will open after pressing the Advanced button in the Calculation options dialog box for beams. For dialog contents see the figure below:

Note: The dialog box shown in the figure above depends on a selected RC code; therefore, contents of the dialog box for the individual codes may differ from these presented above.

Besides the standard buttons (OK, Cancel, Help) the following options are located in the dialog box:

In the Support Moment Redistribution field

• reduction of support moments - when the redistribution coefficient value (percentage) that equals for example 20% is defined in this field, a decrease of the support moments by 20% comparing to the real total moment on a support is forced; it results in the automatic increase of the span moments in the adjoining spans
  Note: For the EN 1992-1-1:2004 AC:2008 code and all national annexes to this code the redistribution coefficient can also be calculated automatically (by selecting the Auto option), based on the formulas from the code.

  
• redistribution coefficient for dead loads - when the redistribution coefficient value that equals for example 0.8 is defined in this field, a decrease of the support moments by 0.2 of the moments caused by dead loads is forced on a support; it results in the automatic increase of the span moments in the adjoining spans
• avoid compression reinforcement in a support - the option operation depends on the existence of the compression reinforcement in a support; if the option is active and during the program operation it is stated that the compression reinforcement in a support is necessary, the support moment redistribution is performed to such a level the compression reinforcement was eliminated.

In the Calculation of Span Length for Concrete Supports field - the options located in this field enable the user to determine the way of accepting by the program the static scheme of a beam with concrete supports.

In a case of the masonry supports the beam static scheme is taken to the masonry support axis. For different codes there may occur differences concerning their requirements with respect to the span calculation length.

The Moment on extreme support (pinned) field allows forcing the moment proportional to the maximal span moment (on the adjoining span) over a pinned support. This option enables the moments resulting from real operation of the supports that have been modeled as ideally pinned to be taken into account in calculations. Once the coefficient value on the pinned extreme support is defined in this field, the program generates a moment whose value equals the product of the coefficient and the maximal span moment.

The Number of calculation points in the span determines the each span section to the defined point number, the points on which the program performs the calculations. The more point numbers are defined by the user the more time for calculations is needed. The calculation results at each point are available on the Beams - results layout, in the Results tab.

The Cantilever length for which the resistance verification is not performed option specifies the length for which the bending resistance is ignored. The resistance of a beam is checked starting from the face, that is, from the place where the reinforcement is not provided (a cover, bending of bars because of the anchorage length). Selecting this option prevents messages about failing to satisfy the resistance condition.

Switching on the option Self-weight taken into account causes a self-weight load case to be included in analysis automatically; the case is generated when a new beam is being defined.

Note: The option is available in the stand-alone version of the RC Beam Design module.

If the Axial force taken into account option is switched on, it causes a beam to be designed as an element subjected to compression and bending. If the Torsion taken into account option is turned on, then a torsional moment is considered while designing a beam. Switching on the Display diagrams for all combinations option allows viewing diagrams of internal forces and deflections for each combination separately. Once the Display diagrams for all combinations option is switched on, the Result saving for all combinations option is available.

It is also possible to activate the Verification only for positive deflections option. This option is not available for all codes.

Note: If the options: Torsion taken into account and Display diagrams for all combinations are switched on, it increases the duration of calculations. The process of generating combinations for variable loads is directly related to n! which causes rapid growth of their number. For ten-odd load records, the number of combinations may exceed 1 million; therefore, the number of load records for the problem defined in this manner, is limited. It should be remembered, that each variable load generates a separate load record on each span.

For the French, American, Polish, Russian and Spanish codes the option allowing application of a reduced shear force at a support is available.

Note: For the following codes: EC2, EC2 - Belgian NAD and EC2 - Italian NAD the options Axial force taken into account and Torsion taken into account are unavailable.