Double-tee beam (51)

Double-tee beam (51) creates flexural, shear, and flange reinforcement for a double-tee beam.

Objects created

Reinforcement meshes.

Use for


Situation	Description
	Double-tee with reinforcement.

Prestress straight or depressed strands for flexural reinforcement in double-tee stems
Mild longitudinal bars for flexural reinforcement in double-tee stems
Mesh for shear reinforcement in double-tee stems
Stirrups in double-tee stems
Reinforcement mesh in the double-tee flange
Transverse and longitudinal mild reinforcing bar in the ends and sides of the double-tee flange
Reinforcement around openings and notches in the double-tee flange

Before you start

Create a concrete double-tee beam.
Calculate the required area and quantity of strands and other reinforcement.
Define other reinforcement properties, such as debonding and pull values.

Selection order

Select the double-tee beam.

The reinforcement is created automatically.

Strand template tab

Use the Strand template tab to define the number and arrangement of vertical strand planes in each stem, and the vertical distances between grid points in each plane.

Grid spacing along Y and along X

Define the grid spacing values for the y axis. If you have selected the strand plane Triple, also define grid spacing values for the x axis.

Separate the values with commas or spaces. The first value is the distance from the the bottom edge of the stem. Each successive value is the distance to the next grid point.

Tip:

Use a multiplier to define a repeating series of values. For example, 8*2 indicates eight holes with a two unit spacing.

Strand planes


Option	Description
	Single
	Double
	Double staggered
	Triple
	Triple staggered

Strand pattern tab

Use the Strand pattern tab to define the placement of strands in the grid points.

External file

With an external CSV file you can define an unlimited amount of individual strands.

Select to use an external file from the Use external file list.

Select an external CSV file by clicking ... button.

Rebar end is same as start

Define the strand input.

Select Yes to use the row and debond information of the strand start for the strands at the strand end.
Select No to define an alternate row and debond information at the end of each strand.

Strand pattern definitions

Define the row and column for each end of the strand using the strand template positions in the strand grid. Strands may have different grid row positions at each end, but a strand cannot cross grid columns.


Option	Description
Strand start - Row	Define the horizontal row number in the strand template for the start of the strand.
Strand start - Debond	Define the debond length at the start of the strand.
Strand end - Row	If Same as left is No, define the horizontal row number in the strand template for the end of the strand.
Strand end - Debond	If Same as left is No, define the debond length at the end of the strand.
Columns	Define a list of one or more column numbers and/or column ranges in the strand template at which a strand should be created.
Size	Define the size of the strands by selecting if from the reinforcing bar catalog.
Grade	Define the strand grade.
Pull	Define the pull force of the strands.
Create strands in	Select strand pattern side settings: Both stems Default Right stem Left stem

Strand profile tab

Use the Strand profile tab to define profiles for the strands. All strands in each stem use the same general profile.

Strand depression profiles


Option	Description
	One point, depressed
	Two points, depressed variable
	Two points, depressed fixed
	Straight
	Three points, depressed variable

Depress position

Define depress positions A, B, and C as either a fixed distance or as a percentage of the member length.

Same as A and Same as B

Define whether depress position B uses the same values as depress position A in the Two points, depressed variable and Two points, depressed fixed strand profiles.

Define whether depress position C uses the same values as depress position B in the Three points, depressed variable strand profile.

Depression spacing type

To define the depression spacing type, select One point, depressed as the strand profile.


Option	Description
Exact location	Define the height of the strand in Strand ht @ position.
Top of depression	Define the distance Xd from the depress point in the outmost reinforcing bar to the edge of the stem.

Longitudinal rebar tab

Use the Longitudinal rebar tab to define longitudinal reinforcement.

Minimum end clear distance C & D

Define the minimum end clearance distance.

Longitudinal rebar definitions


Option	Description
Qty	Define the quantity of reinforcing bars.
Grade	Define the grade of the reinforcing bar.
Size	Define the size of the reinforcing bar by selecting it from the reinforcing bar catalog.
Ht	Define the distance from the end of the reinforcing bar to the face of the strand.

Length type

Define the length type for the reinforcing bar group. Enter additional information in the L, C, or D fields.


Option	Description
Full length	Reinforcing bar extends the full length of the stem, excluding the minimum end clear distance at each end. The L, C, and D fields are disabled.
Centered	Define a fixed length L for the reinforcing bar. The reinforcing bar is place at the center position in the stem. The C and D fields are disabled.
Known L, C	Define a fixed length L for the reinforcing bar and a distance C from the start of the strand. The D field is disabled.
Known L, C	Define a fixed length L for the reinforcing bar and a distance D from the end of the strand. The C field is disabled.
Known C, D	Define a distance C and D from the end of the strand. The L field is disabled.

Stem mesh tab

Use the Stem mesh tab to control the creation of stem meshes and their position.

Stem mesh creation

Define whether one, two, or no stem meshes are created.

Stem mesh dimensions

Define the mesh type by selecting it from the mesh type catalog. The mesh type also defines the mesh grade, mesh size, and bar spacing.


Option	Description
Mesh catalog type	Define the mesh type by selecting if from the mesh catalog.
End distance, de	Define the distance from the edge of the mesh to the edge of the stem.
Bottom clearance, h1	Define the distance from the edge of the mesh to the bottom edge of the stem.
Specify, h3	Select Top clearance. Define the distance from the edge of the mesh to the top edge of the stem.
Specify, h2	Select Mesh height. Define the height of the mesh.
Mesh full length	Define the mesh full length. The options are: Set length E Define the left end length and right end length. Full length Multiple sheets creates overlapping meshes along the short and long sides of the stem. Define the overlap on the Multiple sheets tab.
Left end length, E	Define the length of the left end mesh.
Right end length, F	Define the length of the right end mesh.

Mesh stem position


Option	Description
Mesh stem position	Define the position for both ends of the stem, x1 and x2.

Multiple sheets tab

Use the Multiple sheets tab to define the minimum overlap along the longitudinal and crossing direction of the meshes. Multiple sheets are created if you have selected Mesh full length to be Multiple sheets on the Stem mesh tab.

Overlapping


Option	Description
Min. overlapping (Short Side)	Define the minimum overlap along the crossing direction of the mesh.
Min. overlapping (Long side)	Define the minimum overlap along the longitudinal direction of the mesh.
Mesh leftover	Define whether the leftover is cut, Cut leftover, or not, Overlap leftover.

Stem stirrups tab

Use the Stem stirrups tab to define how the the stem stirrups are created.

Reinforcing bar properties


Option	Description
Spacing	Define the reinforcing bar spacing. Use a space to separate spacing values. Enter a value for each space between the reinforcing bars. For example, if there are 3 reinforcing bars, enter 2 values.
Bars	Define the number of reinforcing bars.
Symmetrical	Define whether the same spacing and reinforcing bar properties are used at the start and end of the stem.
Rebar grade	Define the reinforcing bar grade. If you select the size from the reinforcing bar catalog, the grade value is not used.
Rebar size	Define the reinforcing bar size by selecting it from the reinforcing bar catalog.

Stirrup shape


Option	Description
	No stirrups.
	Open U-shape stirrup with legs.
	180-degree closed stirrups.

Stirrup dimensions


	Description
	Define the length of the stirrup leg.
	Define the distance from the middle of the stirrup leg to the face of the stem. To define the distance, first select Top cover from the Specify list.
	Define the height of the stirrup. To define the height, first select Stirrup height from the Specify list.
	Define the distance from the bottom edge of the stirrup to the bottom edge of the stem.
	Define the distance from the bottom corner edge of the stirrup to the side face of the stem.

Flange tab

Use the Flange tab to define the reinforcing bar mesh for flanges.

Reinforcing bar mesh dimensions


	Description
1	Define the distance from the top edge of the mesh to the top edge of the flange.
2	Define the distance between two longitudinal reinforcing bars.
3	Define the distance from the bottom edge of the mesh to the bottom edge of the flange.
4	Define the distance from the side edge of the mesh to the side edge of the flange.
5	Define the number of reinforcing bars.
6	Define the reinforcing bar spacing. Use a space to separate spacing values. Enter a value for each space between the reinforcing bars. For example, if there are 3 reinforcing bars, enter 2 values.
7	Define the maximum spacing between reinforcing bars.

Reinforcing bar properties

Define the reinforcing bar properties for both the transverse (crossing) and longitudinal reinforcing bars.


Option	Description
Size	Define the reinforcing bar size by selecting it from the reinforcing bar catalog.
Grade	Define the reinforcing bar grade. If you select the size from the reinforcing bar catalog, the grade value is not used.
Mesh catalog type	Define the mesh type by selecting if from the mesh catalog.
Ht	Define the height of the mesh.
Mesh full length	Define whether the mesh is full length or not. If you select No, define the end lengths for the mesh.
Left end length, E	Define the left end length of the mesh.
Right end length, F	Define the right end length of the mesh.
Min. longitudinal overlapping	Define the minimum overlap along the longitudinal direction of the mesh.
Min. cross overlapping	Define the minimum overlap along the crossing direction of the mesh.
Mesh leftover	Define whether the leftover is cut, Cut leftover, or not, Overlap leftover.

Notch/Opening tab

Use the Notch/Opening tab to define the reinforcement around the notches and openings.

Notch/opening reinforcement properties


Option	Description
Min notch dimension, D	Define the minimum notch dimension.
Edge distance, de	Define the distance from the reinforcing bar to the corner of the opening.
Extension, L	Define the distance from the notch opening to the end of the reinforcing bar.
Number of bars	Define the number of reinforcing bars.
Spacing	Define the reinforcing bar spacing. Use a space to separate spacing values. Enter a value for each space between the reinforcing bars. For example, if there are 3 reinforcing bars, enter 2 values.
Rebar size	Define the reinforcing bar size by selecting it from the reinforcing bar catalog.
Rebar grade	Define the reinforcing bar grade. If you select the size from the reinforcing bar catalog, the grade value is not used.

Corner notch reinforcement


Option	Description
	Diagonal reinforcement around the corner notches.
	Parallel reinforcement around the corner notches.

Side/end notch reinforcement


Option	Description
	Diagonal reinforcement around the side or end notch.
	Parallel reinforcement around the side or end notch. Define both the horizontal and vertical reinforcement properties.

Opening reinforcement


Option	Description
	Diagonal reinforcement around the opening.
	Parallel reinforcement around the opening. Define both the horizontal and vertical reinforcement properties.

Edge reinforcement tab

Use the Edge reinforcement tab to create edge reinforcement for the openings.

Reinforcement bar properties


Option	Description
Number of bars	Define the number of reinforcing bars.
Spacing	Define the reinforcement bar spacing. Use a space to separate spacing values. Enter a value for each space between the reinforcing bars. For example, if there are 3 reinforcing bars, enter 2 values.
Rebar size	Define the reinforcing bar size by selecting it from the reinforcing bar catalog.
Rebar grade	Define the reinforcing bar grade. If you select the size from the reinforcing bar catalog, the grade value is not used.

Section view


Option	Description
1	Define the distance from the end of the reinforcing bar to the edge of the stem.
2	Define the distance from the top edge of the reinforcing bar to the face of the stem.
3	Define the distance of the reinforcing bar from the side face of the stem. Enter a positive value to move the reinforcing bar closer to the outer edge of the stem. Enter a negative value to move the reinforcing bar to the inner edge of the stem.
4	Define the distance from the bottom edge of the reinforcing bar to the bottom edge of the stem.

Plan view


Option	Description
1	Define the distance from the middle of the outmost reinforcing bar to the notch/opening reinforcement.

Attributes tab

Use the Attributes tab to define naming and numbering of the strands, stirrups, meshes, and bars.


Option	Description
Prefix	Prefix for the part position number.
Start number	Start number for the part position number.
Name	Tekla Structures uses the name in drawings and reports.
Class	Use Class to group reinforcement. For example, you can display reinforcement of different classes in different colors.

Strand code

Store strand code - With option Store strand code you may choose to store (or not) a user-defined textual attribute TS_STRAND_CODE to part.

Strand code – In field Strand code you may enter a string template for the value of the above mentioned user-defined attribute. The default template is the total number of created strands. The template may contain any text and the predefined fields for:

%NUMBERS – is the numbers of created strands with different sizes and/or grades e.g. 10 (for one size & grade) or 6+4 (if two sizes and/or grades has been used).
%SIZES – sizes of the strands e.g 1/2 or 1/2 + 3/8.
%GRADES – grades of strands.

Strand creation at voids


Option	Description
Create strand at voids	Select Yes to show the strands even though there are voids. Select No to not show the strand if there is a void at any location along the strand path.
Cut strands at voids	Select whether to cut the strands at void locations. Define the cover thickness.
Min. strands length	Define the miminum strand legth.
Ignore cutouts in strand layout	Select whether cutouts are ignored when counting the strand layout.

Mesh creation at voids


Option	Description
Create meshes at voids	Select whether individual stem mesh layers are created when the layer touches a void.
Cut meshes at voids	Select whether to cut the meshes at void locations. Define the cover thickness.

Stem end reinforcement tab

Use the Stem end reinforcement tab to define the properties of reinforcement bars created on the stem ends.


Option	Description
Name	User-definable name of the bar. Tekla Structures uses bar names in reports and drawing lists, and to identify bars of the same type.
Grade	Steel grade of the bar.
Size	Diameter of the bar. Depending on the environment, the nominal diameter of the bar, or a mark that defines the diameter.
Bend radius	Internal radius of the bends in the bar. You can enter a separate value for each bar bend. Separate the values with spaces. Bending radius complies with the design code you are using. Main bars, stirrups, ties, and hooks usually have their own minimum internal bending radii, which are proportional to the diameter of the reinforcing bar. The actual bending radius is normally chosen to suit the size of the mandrels on the bar-bending machine.
Prefix	Prefix for the part position number.
Start number	Start number for the part position number.
Class	Use to group reinforcement. For example, you can display bars of different classes in different colors.
Creation method	Select to create the reinforcement by Number of bars or By spacings.