• Pier Material: The material property associated with the pier.
• Station Location: This is either Top or Bottom, desig- nating the top or the bottom of the pier.
• Pier Thick: The design thickness of the pier.
• Pier Length: The design length of the pier.
• DB1 Left: The user-defined length of the edge member at the left end of the pier. See Figure 6-1 in Chapter 6.
• DB2 Left: The user-defined width of the edge member at the left end of the pier. See Figure 6-1 in Chapter 6.
• DB1 Right: The user-defined length of the edge member at the right end of the pier. See Figure 6-1 in Chapter 6.
• DB2 Right: The user-defined width of the edge member at the right end of the pier. See Figure 6-1 in Chapter 6.
Flexural Design Data
The flexural design data is reported separately for tension design and for compression design. You should check the steel area re- quired for both tension and compression design and use the maximum for your pier.
Tension Design
• Station Location: This is Left Top, Right Top, Left Bottom or Right Bottom, designating the location of the reported reinforcing steel.
• Edge Length: Length of the ETABS-determined edge member or length of the user specified edge member (i.e., DB1). Note that the design algorithm is set up such that the edge length used is always the same for tension design and for compression design.
19
• Tension Rebar: Maximum area of reinforcing steel re- quired to resist tension. If you have specified specific re- bar area units in the shear wall preferences then those units are displayed in the column heading. If no specific units are displayed in the column heading then the rebar area is displayed in the current units.
• Tension Combo: The design load combination associ- ated with the required tension rebar.
• Pu: The factored design axial load associated with the Tension Combo.
• Mu: The factored design moment associated with the Tension Combo.
Compression Design
• Station Location: This is Left Top, Right Top, Left Bottom or Right Bottom, designating the location of the reported reinforcing steel.
• Edge Length: Length of the ETABS-determined edge member or length of the user specified edge member (i.e., DB1). Note that the design algorithm is set up such that the edge length used is always the same for tension design and for compression design.
• Compression Rebar: Maximum area of reinforcing steel required to resist compression. If you have speci- fied specific rebar area units in the shear wall prefer- ences then those units are displayed in the column heading. If no specific units are displayed in the column heading then the rebar area is displayed in the current units.
• Compression Combo: The design load combination as- sociated with the required compression rebar.
• Pu: The factored design axial load associated with the Compression Combo.
19
• Mu: The factored design moment associated with the Compression Combo.
Shear Design Data
• Station Location: This is either Top 2-dir or Bot 2-dir designating the location (top or bottom) of the reported shear reinforcing steel and the direction of force (pier lo- cal 2-axis) for which the steel is provided.
• Rebar: Maximum area per unit length (height) of hori- zontal reinforcing steel required to resist shear. If you have specified specific rebar area/length units in the shear wall preferences then those units are displayed in the column heading. If no specific units are displayed in the column heading then the rebar area/length is dis- played in the current units.
• Shear Combo: The design load combination associated with the specified shear reinforcing.
• Pu: The factored design axial load associated with the Shear Combo.
• Mu: The factored design moment associated with the Shear Combo.
• Vu: The factored design shear associated with the Shear Combo.
Boundary Element Check Data
• Station Location: This is either Top 2-dir or Bot 2-dir designating the location (top or bottom) of the boundary element check and the direction of force (pier local 2- axis) for which the boundary elements are checked.
• B-Zone Length: This is a required length, such as 22.762 inches, or it is Not Needed, or it is Not Checked. Not Needed indicates that boundary elements are not re- quired. Not Checked means that no check for boundary elements is done by ETABS because the ratio Pu/Po is
greater than or equal to 0.35.
Note:
See Chapter 11 for more infor- mation on the boundary ele- ment check.
19
When this item is Not Needed or Not Checked ETABS fills in the B-Zone Combo, Pu, Mu, Vu, and Pu/Po items with the data from the design load combination that has the largest Pu/Po value. Otherwise ETABS fills in the data from the design load combination that requires the longest boundary zone length.
• B-Zone Combo: The design load combination associ- ated with the specified B-Zone Length.
• Pu: The factored design axial load associated with the B-Zone Combo.
• Mu: The factored design moment associated with the B- Zone Combo.
• Vu: The factored design shear associated with the B- Zone Combo.
• Pu/Po: The ratio Pu/Po associated with the B-Zone
Combo. Note that if the ratio is greater than or equal to 0.35 then ETABS does not check the boundary zone re- quirement. See Section 1921.6.6.3 in the 1997 UBC.