Advanced Options dialog (RC beams)

The Advanced Options dialog allows you to define the additional options for calculations during the RC beam design.

Access

Click Analysis Calculation Options, and then click Advanced.
Click , and then click Advanced.

Dialog elements

Note: The content of the Advanced Options dialog depends on the code selected during the RC beam design and some of the option may not be available.

Support Moment Redistribution

Reduction of support moments by: 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 permanent 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 compressive reinforcement at 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.

Calculation span length for concrete supports: Enables 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.

Moment on extreme support (pinned): 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.

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.

Cantilever length for which the resistance verification is not performed: 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.

Automatic generation of self-weight for new beams: If the option is selected then 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.

Axial force taken into account: If the option is selected, it causes a beam to be designed as an element subjected to compression and bending. Once the Display diagrams for all combinations option is switched on, the Result saving for all combinations option is available.

Torsion taken into account: If the option is selected, then a torsional moment is considered while designing a beam.

Display diagrams for all combinations: Allows viewing diagrams of internal forces and deflections for each combination separately.

Redistribution of a shear force near supports: Allows application of a reduced shear force at a support.
Note: This option is available for the French, American, Polish, Russian and Spanish codes.

Additional calculation points: Creates few additional calculation points for each of the spans. These points are created in the extremes of internal forces and near the support and opening edge. This option allows more adequate calculations with a slight increase of the number of calculation points.

Note: If the options: Torsion taken into account and Display diagrams for all combinations are selected, 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.