Elevated Slabs - Design Strip Detail Reports

This topic is specific to design strip detail report results.

Note

See the Elevated Slabs - Design Strip Modeling topic for information on modeling design strips.
See the Elevated Slabs - Spreadsheet Results topic for information regarding spreadsheet results.

Design Strip Detail Reports

The detail report gives detailed information about the design strip. Here we will walk through how to access the analytical and design information for the Design Strips.

Note:

In order to get results for a Design Strip, you must first draw Support Lines.

Accessing the Detail Reports and the Specific Windows

Once you have a solved model, the detail reports become available. They are accessible in two ways:

If you have the Slab Results/Rebar spreadsheet open in the Design Strip Results tab, there will be a button at the top of the screen: . This will open up the detail report window.
If you are in a graphic view of your model, there is a button that will open up the detail report window when you click on a particular Design Strip.

Once the detail report window is open, you will see a dialog area at the top.

- Allows you to click between the different design strips in your model.
- This button will allow you to take a snapshot of the current detail report you are viewing so that it can be added to a report. View the Printing topic for more information.
- This dropdown list allows you to select between the total design strip results or the three different design region results. Below we will explain the importance of each of these sections.

Total Design Strip Detail Report

The Total Design Strip report gives an overall summary of the full width of the design strip. The Total Design Strip will only give analysis information (not design/reinforcement information). The picture below illustrates the Design Cut across the Total Design Strip (at only one span for simplicity).

Input Echo

This lists information about the total design strip details. Below is the input echo portion of the detail report.

Criteria	Description
Strip	Slab Design Strip Label defined in the Slab Design Strips spreadsheet
Material	Slab Material defined in the Slab Definitions spreadsheet
Total Cuts/Span	Number of Design Cuts defined in the Slab Design Strips spreadsheet/Number of spans per support line
Design Rule	Design strip Design Rule defined in the Slab Design Strips spreadsheet
Strip Orientation	N-S or E-W defined in the Slab Design Strip Spreadsheet
Concrete Weight	Slab weight defined in the Slab Definitions spreadsheet
Lamda	Lightweight concrete modification factor defined in the Concrete Materials spreadsheet
E_Concrete	Elastic modulus defined in the Concrete Materials spreadsheet
Tension Bar Fy	Strength of Bar in tension defined in the Materials spreadsheet- Concrete tab- Flex Steel
F'c	Concrete Yield Stress from Material spreadsheet
Flex. Rebar Set	The Concrete Rebar Set is selected in the Global Paremeters- Concrete tab. The Standard ASTM A615 (imperial), ASTM A1064 (imperial) and ASTM A615M (metric) are supported.
Stress Block	Stress Block from the Model Settings- Concrete tab. Only Rectangular is supported.
Top Cover	Clear cover from the top bar to the top of slab
Bottom Cover	Clear cover from the bottom bar to the bottom of the slab
Rho Min (T&S)	The ratio of reinforcement corresponding the area of steel to bd
Slab Thickness	Overall thickness of the slab defined in the Slab Definitions spreadsheet.

Diagrams

The Shear and Moment diagrams display the Envelope result based on the Load Combinations checked. The program assumes that your spans start and end at a support. The supports are represented in the diagrams as gaps. The column strip and Mid-strip detail reports will show the support labels in the Rebar Detailed Drawing for reference. The minimum and maximum values are listed at the bottom for the entire support line.

Analysis Results

This portion gives the detailed information of the diagrams above displaying the minimum and maximum shear and moment in each span, along with the controlling location.

Slab Strip Deflections

These deflections are based on the Total Design Strip width along the Support Line Spans. The program also reports this value in the Slab Strip Deflections spreadsheet. The Slab Strip Deflection is based on the Load Categories (not Load Combinations). Each Support Line has a Slab Design Rule which defines the Deflection criteria. The program finds the actual deflection and compares it to the limits defined in the Slab Design Rule to calculate the ratio.

The program checks each span separately, and within those spans each Design Cut is checked to find the maximum deflection.

Column Strip/Middle Strip Detail Report

The Column Design Strip, Mid-Strip Right and Mid-Strip Left Detail Report gives the summary of the all the cuts within that strip. The picture below illustrates the Design Cuts (pink dashed lines) across the strip (at only one span for simplicity).

Rebar Detailed Drawing

The Column Strip and Mid-Strip Detail Reports have reinforcement design. The Rebar Detailed Drawing is directly in-line with the Moment diagrams so that you can see the analytical demand. Below shows a picture describing all of the labels and symbols on the drawing.

Note:

For full description of how the reinforcement is designed, see the Reinforcement Design topic.
The units shown in the Rebar Detailed Drawing are based on the Dimensions units in the Unit Selection dialog unless noted otherwise.

If there are any overlapping items in the detail report diagrams when using metric units, change the dimensions to centimeters instead of millimeters and most of the overlapping goes away.
The reinforcement is reported per Design Region and it's orientation is perpendicular to the Auto-Design Cut. Below is an example that shows a Design Strip that has spans that are orthogonal and skewed.

There are two numbers listed at the bottom of the Reinforcement drawing. One indicates the Rebar length, the other indicates the Span length.

Analysis Results

This portion gives the detailed information of the diagrams above displaying the minimum and maximum in each span and the controlling location. The location is the overall location in relation to the Support Line.

Code Check and Bending Steel Results

The first table describes the positive moment demand and the top reinforcement.

Criteria	Description
Gov Loc	This gives the overall location along the span that yielded the worst case design cut for top reinforcement design. See below for more information.
Top Bending Check	This is a calculated code check based on the top reinforcement design capacity vs. moment demand.
Gov Mu Top	This is the largest moment demand in this segment. The top reinforcement spacing must be equal on both sides of a support so this governing positive moment could be from the left or right of the support. See Gov Loc for the actual location.
Gov LC	This is the governing Load Combination for the top reinforcement.
phi*Mn top	This is the capacity based on the amount of top reinforcement.
Gov Cut	This is the governing Design Cut that controls the design for the top reinforcement.
Top Rebar	Size and spacing of flexural reinforcement at the top of the slab. If welded wire bars are designed, the output result will be preceded by a “D” instead of “#” to indicate wire bar size.
Top As Prvd	Area of Steel provided in the top of the slab
Top As Reqd	Area of Steel required in the top of the slab

Governing Location- This gives the overall location along the span that yielded the worst case design cut. This table is organized by the governing location because at each support point there will be one governing location that controls the design. The top reinforcement is required to be the same spacing at each side of support point.

This governing location is also displayed on the Rebar Detailed Drawing with a red "tick" mark and the dimension listed.

The second table describes the negative (mid-span) moment demand and the bottom reinforcement. This table is span based since the bottom reinforcement is designed span by span.

Criteria	Description
Bot Bending Check	This is a calculated code check based on the bottom reinforcement design capacity vs. moment demand.
Gov Mu Bot	This is the largest negative moment demand in the span.
Gov LC	This is the governing Load Combination for the bottom reinforcement.
phi*Mn bot	This is the capacity based on the amount of bottom reinforcement.
Gov Cut	This is the governing Design Cut that controls the design of the bottom reinforcement.
Bot Rebar	Size and spacing of flexural reinforcement at the bottom of the slab. If welded wire bars are designed, the output result will be preceded by a “D” instead of “#” to indicate wire bar size.
Bot As Prvd	Area of Steel provided in the bottom of the slab
Bot As Reqd	Area of Steel required in the bottom of the slab
Rho Prvd(Gross)	The ratio of reinforcement corresponding the area of steel (entire slab) to bd

Column Strip/Middle Strip Deflection

The Total Design Strip is broken into 3 regions: Column Strip, Mid-Strip Left and Mid-Strip Right. The Detail Report gives more information on the deflection by reporting the maximums in each of these regions.

The Slab Strip Deflection is based on the Load Categories (not Load Combinations). Each Support Line has a Slab Design Rule which defines the Deflection criteria. The program finds the actual deflection and compares it to the limits defined in the Slab Design Rule.

Design Cut Detail Reports

Similar to the detail report for Design Strips, you have the ability to view the detail report for a Design Cut. Each Design Strip is made up of multiple Design Cuts. The Design Cuts reports are given for each cut in the Design Strip and allow you to get detailed calculation information.

Note:

It is also possible to manually create single cuts and get results for these as well. See Elevated Slab - Design Strip Modeling topic for more information.

Accessing the Design Cut Detail Reports

Once you have a solved model, the Design Cut detail reports become available. They are accessible in two ways:

From within the Design Strip detail report, you can switch to the first controlling Design Cut by clicking on the cut button at the top of the screen.
If you are in a graphic view of your model, there is a button that will open up the detail report window when you click on a Design Cut.

Once the detail report window is open, you will see a dialog area at the top.

- Allows you to toggle between the different Design Cuts in your model.

- This button will allow you to take a snapshot of the current detail report you are viewing so that it can be added to a report. View the Printing topic for more information.

There are drop-down menus to help navigate between design regions, spans and cuts.

Input Echo

This lists information about the Design Cut details. Below is the input echo portion of the detail report.

Criteria	Description
Cut	Slab Design Cut Label automatically generated within each Design Strip
Material	Slab Material defined in the Slab Definitions spreadsheet
Start	Point Location defining the start of the Design Cut
End	Point Location defining the end of the Design Cut
Max Top bar Spac	Maximum Top Rebar Spacing defined in the Slab Design Rules spreadsheet
Min Top bar Spac	Minimum Top Rebar Spacing defined in the Slab Design Rules spreadsheet
Max Bot bar Spac	Maximum Bottom Rebar Spacing defined in the Slab Design Rules spreadsheet
Min Bot bar Spac	Minimum Bottom Rebar Spacing defined in the Slab Design Rules spreadsheet
Stress Block	Stress block used in the analysis defined in Model Settings
Slab Design Option	Slab Design Option used in the rebar design defined in Model Setting
Rebar Spacing Inc	The increment of bar spacing the program will try during the iteration of design
Design Rule	Design Rule defined in Slab Design Rules spreadsheet

Design Cut - Total

The Total Design Cut contains only analysis results in the Design Cut detail report. Since the Design Strip reinforcement design is based on the Design region (Column Strip, Middle Strip) this Detail Report does not show any reinforcement. It is a useful to present the summation of forces in the entire Design Cut. Listed below are the available controlling values along the total length of the Design Cut.

Criteria	Description
Gov Mu Top	Governing maximum positive moment value
Gov Mu Bottom	Governing maximum negative moment value
Gov Vu	Governing maximum shear value
Max Deflection	Maximum deflection anywhere along Total Design Cut
Gov Category	The governing categories defined in the Slab Design Rules- Deflection tab. This in not LC based rather Load Category based. See the Deflection Calculations section for further information.

Design Cut - Column/Middle Strip

Criteria	Description
Top Bending Check	This is a calculated code check based on the top reinforcement design capacity vs. moment demand.
Gov Mu Top	Total positive moment along the cut. (CSA A23.3-14 uses Mf)
phi*Mn Top	This is the capacity based on the amount of top reinforcement. (CSA A23.3-14 uses Mr)
Bot Bending Check	This is a calculated code check based on the bottom reinforcement design capacity vs. moment demand.
Gov Mu Bottom	Total negative moment along the cut. (CSA A23.3-14 uses Mf)
phi*Mn Bot	This is the capacity based on the amount of bottom reinforcement. (CSA A23.3-14 uses Mr)
1 Way Shear Check	This is a calculated code check based on the shear capacity of the concrete slab v shear demand.
Gov Vu	Total shear along the cut. (CSA A23.3-14 uses Vf)
phi*Vn	Shear capacity of the concrete slab. (CSA A23.3-14 uses Vr)
Strain(ey)	CSA A23.3-14 longitudinal strain calculated per the General Method in section 11.3.6.4
Tension Bar Fy	Minimum yield stress of tension reinforcement.
F'c	Concrete compressive strength defined in the Slab Definitions spreadsheet.
Flex. Rebar Set	Flexural Rebar Set defined in the Model Settings- Concrete tab.
Concrete Weight	Slab weight defined in the Slab Definitions spreadsheet.
Lamda	Lightweight concrete modification factor defined in the Concrete Materials spreadsheet.
E_Concrete	Elastic modulus defined in the Concrete Materials spreadsheet.
Top Cover	Distance from top slab edge to top reinforcement defined in the Slab Design Rules Spreadsheet.
Bottom Cover	Distance from bottom slab edge to bottom reinforcement defined in the Slab Design Rules Spreadsheet.

Area of Steel Required

The program calculates the area steel required based on the steps listed below. The green text indicates the number that governed for that Design Cut.

Step 1 (Analysis): Calculate the area steel required by analysis. Select a spacing and number of bars that fit the design region.

Step 2 (Min Flex): Check that the minimum reinforcement for flexure is being met per ACI 318-14 Section 9.6.1 (ACI 318-11 Section 10.5, CSA A23.3-14 Section 10.5.1.2).

Step 3 (4/3): Check the 4/3*As required by analysis per ACI 318-11 Section 10.5.3, CSA A23.3-14 Section 10.5.1.3.

Note: ACI 2014 does not use the 4/3 As for slabs, the results will show NA.

In the example shown below, the green text indicates that the Top Area of Steel Provided met the Analysis requirements and was increased to meet the Minimum Flexural requirements. Since the 4/3 was greater than Min Flex, it was not used.

The bottom reinforcement design is the same as listed above except the temperature and shrinkage requirements are also checked. The bottom reinforcement must be uniform across the entire span but the top reinforcement will stop and start over supports. Therefore the mid-span cuts where there is only bottom reinforcement will always govern for temperature and shrinkage. Below shows an example where the As required is being governed by Temperature and Shrinkage.

Cross Section Detailing

Depending on the Slab Design Option users selected in Global Model Setting - Concrete tab, the Cross Section Detailing can be different.

If the Construction Method is selected, the cross section will show the actual rebar amount:

If the Theoretical Method is selected, the cross section will show a generic view and the rebar displayed are for reference only. We do not show the rebar amount because the rebar calculation is based on average rebar area and the rebar amount may not be an integer:

Manual Design Cut Detail Reports

Similar to the detail report for Design Strips, you have the ability to view the detail report for a manual Design Cut. You will not receive design information for this option but will be able to view analysis results including governing moment and shear magnitudes.

Note:

In order to get results for this feature, you must first draw the Design Cut. See Manual Slab Design Cuts for more information.

Accessing the Design Cut Detail Reports

Once you have a solved model, the Design Cut detail reports become available. They are accessible in two ways:

If you have the Slab Results/Rebar spreadsheet open under the Design Cut Results, there will be a button at the top of the screen: . This will open up the detail report window.
If you are in a graphic view of your model, there is a button that will open up the detail report window when you click on a Design Cut.

Once the detail report window is open, you will see a dialog area at the top.

- Allows you to toggle between the different Design Cuts in your model.
- This button will allow you to take a snapshot of the current detail report you are viewing so that it can be added to a report. View thePrintingtopic for more information.

Input Echo

This lists information about the Design Cut details. Below is the input echo portion of the detail report.

Criteria	Description
Cut	Slab Design Cut Label defined in the Slab Design Strips spreadsheet under the Cuts tab
Material	Slab Material defined in the Slab Definitions spreadsheet
Start	Point Location defining the start of the Design Cut
End	Point Location defining the end of the Design Cut
Stress Block	Stress block used in the analysis defined in Model Settings
Design Rule	Design Rule defined in Slab Design Rules spreadsheet
Top d	Slab thickness minus top cover
Bot d	Slab thickness minus bottom cover
Tension Bar Fy	Minimum yield stress of tension reinforcement
F'c	Concrete compressive strength defined in the Slab Definitions spreadsheet
Concrete Weight	Slab weight defined in the Slab Definitions spreadsheet
Lamda	Lightweight concrete modification factor defined in the Concrete Materials spreadsheet
E_Concrete	Elastic modulus defined in the Concrete Materials spreadsheet
Top Cover	Distance from top slab edge to top reinforcement defined in the Slab Design Rules Spreadsheet
Bottom Cover	Distance from bottom slab edge to bottom reinforcement defined in the Slab Design Rules Spreadsheet

Analysis Results

The analysis results are included the Design Cut detail report. Listed below are the available controlling values along the total length of the Design Cut.

Criteria	Description
Gov Mu Top	Total positive moment along the cut.
Gov Mu Bottom	Total negative moment along the cut.
Gov Vu	Total shear along the cut.

These values are also available in the Slab Results/Rebar spreadsheet after an analysis is ran. See Elevated Slabs - Spreadsheet Results for more information.