Errors in composite slabs
The "Errors" option, within the "Composite slabs" menu on the "Results" tab, allows you to view the errors obtained following the analysis for each of the composite slab sections.
After clicking on this option, any composite slab floor panels with errors in strength or deflection, or any other issues, will be highlighted in red.
For more information about the specific error, left-click on the icon.
The "Previous" and "Next" buttons in the dialogue box allow you to navigate between the other sections of the floor plan that contain errors.
Description and solutions for errors in composite slabs
Below are some of the defects that may occur in the slab surfaces of composite slabs, along with recommended measures to rectify them:
| Error | Description | Solution |
| In the selected series no deck has been found with sufficient thickness: Fails shear check. | No deck thickness has been found in the series that meets this condition in the service phase. | Increase the total depth of the floor slab or change the type of deck. |
| In the selected series, no deck has been found with sufficient thickness: Fails shear check. | No deck thickness has been found in the series that meets this condition in the service phase. | Increase the total depth of the floor slab or change the type of deck. |
| In the selected series, no deck has been found with sufficient thickness: Flexure failure. | No deck thickness has been found in the series that meets this condition in the service phase. | Increase the total depth of the floor slab or change the type of deck. |
| The thickness of the selected deck is not sufficient: Fails shear check. | The deck provided by the user does not meet this condition in the service phase. | Increase the total depth of the floor slab, change the deck thickness or let the program design the necessary deck. |
| The thickness of the selected deck is not sufficient: Fails shear check. | The deck provided by the user does not meet this condition in the service phase. | Increase the total depth of the floor slab, change the deck thickness or let the program design the necessary deck. |
| The thickness of the selected deck is not sufficient: Flexure failure. | The deck provided by the user does not meet this condition in the service phase. | Increase the total depth of the floor slab, change the deck thickness or let the program design the necessary deck. |
| In the selected series, no deck has been found with sufficient thickness to avoid shoring. | This warning appears when the user has opted for the program to design the deck for the execution phase, but there is no deck thickness in the series that meets this condition. In this case, the program places the deck chosen by the user and calculates the spacing between shores. | Reduce the span of the floor structure or install beams perpendicular to the sheets (cross-beams) between the main beams. The spans recommended by some manufacturers may vary between 2 and 3 metres, depending on the floor loads, to ensure a installation that is unshored. |
| Fails shear check. | Appears when additional shear reinforcement is required. However, the program does not allow shear reinforcement in this type of slab. | Increase the floor slab depth. |
| The shear cannot be resisted by this floor slab | The program calculates the shear reinforcement internally, although it is not provided in practice, and this error appears when it cannot find reinforcement to withstand such a force. | Increase the floor slab depth. |
| No reinforcement has been found to meet the existing ultimate moment | The positive bending moment is too large. | Increase the floor slab depth. |
| Compression reinforcement is needed to resist the positive flexure | The flexure makes the concrete unable to resist the existing compression. | Increase the floor slab depth. |
| The width of the rib does not allow for the reinforcement due to compatibility problems with the bar spacing and cover | The bottom reinforcement does not fit in the rib width. | Modify the reinforcement table and reduce the number of bars per rib or increase the floor slab depth. |
| No reinforcement has been found that meets the geometric and mechanical minimums | There is no bottom reinforcement in the table that allows meeting the minimum cited reinforcement ratios. | Edit the reinforcement table as required. |
| Top reinforcement outside table range | The top reinforcement defined in the tables is not sufficient, but the program calculates the necessary reinforcement anyway. | Increase the floor slab depth. |
| Insufficient section for negative moment | The compressed zone does not resist the compressions produced by the negative moment. | Increase the floor slab depth. |
| Required top reinforcement area | The forces exceed the maximum the slab is able to resist. The required area of steel is shown. | Increase the floor slab depth. |
| The width of the floor support beams is not sufficient to anchor the bottom reinforcement correctly. | The lateral cover is greater than the width of the support beam. | Increase the section of the support beam so that it has a greater width |
| Dead load instant. deflection limit | This deflection limit is exceeded. | Increase the floor slab depth. |
| Live load instant. deflection limit | This deflection limit is exceeded. | Increase the floor slab depth. |
| Total instant. deflection limit | This deflection limit is exceeded. | Increase the floor slab depth. |
| Total long-term deflection limit | This deflection limit is exceeded. | Increase the floor slab depth. |
| Active deflection limit | This deflection limit is exceeded. | Increase the floor slab depth. |
