Column Design

Using the results obtained from the analysis of the entire structure and additional design data, automatically design concrete column members according to the following design codes: AASHTO-LRFD 16, AASHTO-LFD96, CSA-S6-14, EN 1992-2 including UK and Italy national annex, IRC:21-2000, IRC:112-2011, SNiP 2.05.03-84*, SP 35.13330.2011, TWN-BRG-LSD90.

Chinese and Korean specifications are available upon request.

From the Main Menu select Design > RC Design > Concrete Code Design > Column Design.

Shortcut key : [Ctrl]+2

The automatic design results sorted by elements are based on the maximum axial forces, biaxial moments and shear forces calculated at the positions (I, 1/4, 1/2, 3/4 & J) of each element in accordance with the load combinations for concrete design. Factored strength ratios with respect to the design strengths are evaluated on the basis of P-M interaction diagrams.

The automatic design results sorted by section properties are based on the results that produce the maximum strength ratios in the P-M diagrams by considering all the elements and locations pertaining to each section property in accordance with the load combinations for concrete design.

The results appear in blue when the automatic design for the given properties is satisfactory, otherwise they appear in red, which represent the results are unsatisfactory.

The automatic design provides optimal rebar sizes, the number of rebars and the number of rows of rebars satisfying the rebar spacing and ratio, using the main rebars (maximum 5 types) and sub-rebars (1 type) entered by the user.

The automatic design results are produced in the unit system selected by the user.

SEL: Select members for redesign and production of results

ELEM: Element number

SECT: Section property number

Shape: Symbol for sectional shape

= SB: Rectangular section

= B: Rectangular section with hollow core

= SR: Circular section

= P: Circular section with hollow core

= STRK: Track type section

= TRK: Track type section with hollow core

= HTRK: Half track section

= SOCT: Octagonal section

= OCT: Octagonal section with hollow core

Bc, Hc: Width, height (depth) of column member

a, b: Corner dimensions of octagonal section

t: Thickness of hollow core section

f'c (fck): Design compressive strength of concrete ( if  Design code is Eurocode2-2:05)

Height: Height (length) of column member

fy (fyk): Design yield strength of main rebars. ( if  Design code is Eurocode2-2:05)

fys (fyw): Design yield strength of shear rebars ( if  Design code is Eurocode2-2:05)

CHK: Status of automatic design results (Results are produced in the state for convenience)

The above symbols representing the status are combined to show "OK, NPV, N**, etc.
 

LCB: Load combination yielding the maximum factored load ratio determined from the P-M diagram. The program examines all the load combinations and sectional locations of the relevant element or section property to find the maximum ratio.

POS: Section design points

Pu (N_Ed): Factored compression (tension) force acting on the column member under the load combination displayed in LCB ( if  Design code is Eurocode2-2:05)

= Pu > 0: Compressive axial force acting in the member's axial direction

= Pu < 0: Tensile axial force acting in the member's axial direction

Rat-P: Ratio of the factored axial force (Pu) to the design axial strength (Pn). The ratio larger than 1.0 signifies that the design strength is unsatisfactory even if the rebar quantity is increased to the maximum rebar ratio or the minimum rebar spacing for the relevant column section.

Mc (M_Ed): Factored bending moment in the column member under the load combination displayed in LCB.(if  Design code is Eurocode2-2:05) The value is calculated as follows:

Rat-M: Ratio of the factored bending moment (Mc) to the design bending moment strength (Mn). The ratio larger than 1.0 signifies that the design strength is unsatisfactory even if the rebar quantity is increased to the maximum rebar ratio or the minimum rebar spacing for the relevant column section.

Ast: The quantity of main rebars auto-calculated by the program. This is larger than the minimum rebars specified by the codes.

Vu (V_Ed): Factored shear force in the column member under the load combination displayed in LCB.(if  Design code is Eurocode2-2:05).

Rat-V: Ratio of the factored shear force (Vu) to the design shear strength (Vn). The ratio larger than 1.0 signifies that the design strength is unsatisfactory even if the ties spacing is reduced to the minimum for the relevant column section.

Asvy:The quantity of shear rebars auto-calculated by the program for y axis (local) of the column.

Asvz:The quantity of shear rebars auto-calculated by the program for z axis (local) of the column.

Ties/Spirals: Type, size and spacing of ties/spirals to be provided depending upon the greater of Asvy, Asvz.

Common Control

 : Display the applicable code for automatic design.

 : Display the unit system selected by the user.

 : Select all members

 : Cancel the selection of all members

Redesign the selected members. When the redesign is executed from the results displayed by section properties all the elements attributed to the same sections are included.

 : Display detail automatic design results

 : Display simplified automatic design results

 : Produce the automatic design results in summary calculations for the selected members.

 : Produce the summary list of automatic design results for the selected members.

The maximum forces (results of maximum reinforcing steel) calculated at each sectional location (I,M & J) are produced.

Plot the results and the corresponding P-M interaction diagram applicable for the factored axial force and biaxial moments.

All: Produce all the auto-designed results in the Design Results dialog box

OK: From the auto-designed results, display only the design results that have met the design requirements (OK) in the Design Results dialog box

NG: From the auto-designed results, display only the design results that have not satisfied the design requirements (NG) in the Design Results dialog box

 : Close the dialog box