When frame section properties are specified for rectangular or circular concrete members, some of the reinforcing information for that member can also be specified using the Reinforcement Data form.
Rebar Material
Longitudinal Bars and Confinement Bars drop-down lists. Select previously defined rebar materials from these drop-down lists, or click the + (plus) symbol preceding the drop-down lists to access the Define Materials form and add or modify a material property definition for use in the rebar material definition.
Design Type. The choice made in the Design Type area of the Reinforcement Data form—Column or Beam—determines the parameters to be provided in the balance of the form.
Column
If the Design Type is Column, provide input for the following:
Reinforcement Configuration options.
If the Section Type is Circle on the Frame Properties form, the reinforcement can be circular only.
If the Section Type is Rectangular on the Frame Properties form, specify rectangular or circular reinforcement.
Confinement Bars options.
If the Reinforcement Configuration is Rectangular, the Confinement Bars can be Ties only.
If the Reinforcement Configuration is Circular, the Confinement Bars (transverse) can be Ties or Spiral.
Rectangular Configuration options. If the Section Type is Rectangular on the Frame Properties form and the Reinforcement Configuration is "Rectangular," provide input for the following:
Longitudinal Bars
Clear Cover for Confinement Bars edit box. This is the clear cover from the edge of the column to the confinement bar.
Number of Longit. Bars Along 3-dir Face edit box. This is the number of longitudinal reinforcing bars (including corner rebar) on the two faces of the column that are parallel to the local 3-axis of the section.
Number of Longit. Bars Along 2-dir Face edit box. This is the number of longitudinal reinforcing bars (including corner rebar) on the two faces of the column that are parallel to the local 2-axis of the section.
Longitudinal Bar Size drop-down list. This is the specified size of longitudinal reinforcing steel for the section. Only one longitudinal bar size can be specified for a given concrete frame section property.
TIP: Click the + (plus) symbol beside the Longitudinal Bar Size or Confinement Bar Size (see below) drop-down list to access the Rebar Sizes form. Use that form to add or modify the rebar size for this definition.
Confinement Bars
Confinement Bar Size drop-down list. This is the specified size of confinement reinforcing steel for the section. Only one confinement bar size can be specified for a given concrete frame section property.
Longitudinal Spacing of Confinement Bars edit box. Use the default or specify another value for the spacing of the confinement bars.
Number of Confinement Bars in 3-dir edit box. This is the number of confinement reinforcing bars that run parallel to the local 3-axis of the section.
Number of Confinement Bars in the 2-dir edit box. This is the number of confinement reinforcing bars that run parallel to the local 2-axis of the section.
Circular Configuration options. If the Section Type is Rectangular or Circle on the Frame Properties form and the Reinforcement Configuration is "Circular," provide input for the following:
Longitudinal Bars
Clear Cover for Confinement Bars edit box. This is the clear cover from the edge of the column to the confinement bar.
Number of Longitudinal Bars edit box. This is the number of longitudinal reinforcing bars in the section.
Longitudinal Bar Size drop-down list. This is the specified size of reinforcing steel for the section. Only one bar size can be specified for a given concrete frame section property.
Confinement Bars
Confinement Bar Size drop-down list. This is the specified size of confinement reinforcing steel for the section. Only one confinement bar size can be specified for a given concrete frame section property.
Longitudinal Spacing of Confinement Bars edit box. Use the default or specify another value for the spacing of the confinement bars.
Beam
If the Design Type is Beam, provide input for the following:
Concrete Cover to Longitudinal Rebar Center options. Rebar cover is specified at the top and bottom of the beam. The Top cover is measured from the top of the beam to the centroid of the top longitudinal reinforcing. The Bottom cover is measured from the bottom of the beam to the centroid of the bottom longitudinal reinforcing.
Reinforcement Overrides for Ductile Beams options. The reinforcement overrides are specified areas of longitudinal reinforcing steel that occur at the Top and Bottom of the left and right ends of the beam. These overrides are used by SAP2000 as follows:
In the Concrete Frame Design postprocessor
When the design shear in a concrete beam is to be based on provided longitudinal reinforcement (that is, the shear design is based on the moment capacity of the beam), SAP2000 compares the calculated required reinforcement with that specified in the reinforcement overrides and uses the larger value to determine the moment capacity on which the shear design is based.
When the minimum reinforcing in the middle of a beam is to be based on some percentage of the reinforcing at the ends of the beam, SAP2000 compares the calculated required reinforcement at the ends of the beam with that specified in the reinforcement overrides and uses the larger value to determine the minimum reinforcing in the middle of the beam.
When the shear design of columns is to be based on the maximum moment that the beams can deliver to the columns, SAP2000 compares the calculated required reinforcement with that specified in the reinforcement overrides and uses the larger value to determine the moment capacity of the beam.
For any degree of freedom in the frame nonlinear hinge properties assigned to a concrete member that is specified as default, SAP2000 calculates the hinge force-deformation properties based on the larger of the calculated required reinforcement at the ends of the beam (assuming that run the design has been run through the Concrete Frame Design postprocessor) and the specified reinforcement overrides.
Check/Design options. Specify that a member with this frame section property be checked or designed by SAP2000's Concrete Frame Design postprocessor. If the reinforcement is to be checked, all information in the Reinforcement Data form is used. If the reinforcement is to be designed, all information in the Reinforcement Data form is used except the bar size, which is ignored, and the total required steel area is calculated. The Reinforcement Configuration, Longitudinal Rebar data and Cover to Rebar Center are used.
If reinforcing is specified in a concrete column frame section property that was specified using the Section Designer utility, the Concrete Frame Design postprocessor checks the column for the specified reinforcing or designs new reinforcing depending on the option that was selected in Section Designer.
See Also
Access the Reinforcement Data form as follows:
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