Beam Design

 

 

 

Using the results obtained from the analysis of the entire structure and additional design data, automatically design concrete beam members according to the following design codes: American Concrete Institute (ACI318-89, ACI318-95, ACI318-99, ACI318-02 & ACI318-05), British Standard (BS8110-97), European Standard (ENV 1992-1-1:1992 & EN 1992-1-1:2004) and Canadian Standards Association (CSA-A23.3-94).

 

Architectural Institute of Japan (AIJ-WSD99), Architectural Institute of Korea (AIK-USD94), Korean Society of Civil Engineers (KSCE-USD96), Korean Concrete Institute (KCI-USD03 & KCI-USD99), Architectural Institute of Korea (AIK-WSD2K), China Standard (GB50010-02),Taiwan Standard (TWN-USD92)  and Indian Standard (IS456:2000) are available upon request.

 

 

 

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

 

Shortcut key : [Ctrl]+1

 

 

 

 

The automatic design results sorted by members are based on the maximum negative and positive moments and shear forces calculated at the positions (I,1/4,1/2,3/4 & J) of each member in accordance with the load combinations for concrete design.

 

The automatic design results sorted by section properties are based on the results that yield the maximum quantity of rebars computed by considering the members 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 position M represents one of 1/4,1/2 & 3/4 positions considered for the results of the automatic design, based on most unfavorable negative and positive moments and shear forces.

 

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

 

When the user elects not to enter the rebar data, the program automatically designs the members using #7 for the main rebars placed in a maximum of two layers and #3 for the sub-rebars.

 

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

 

 

Parameters of Beam Design Result Dialog Box:

 

MEMB: Member number

 

SECT: Section property number

 

SEL: Select members for redesign and production of results

 

Span: Length of beam member

 

Section: Section Name

 

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

 

bf, hf: Width, thickness of the flange of T-shape section

 

f'c: Design compressive strength of concrete

 

fy: Design yield strength of main rebars

 

fys: Design yield strength of shear rebars

 

POS: Automatic design positions (I,M,J)

 

The design results for M reflect the automatic design for the maximum negative and positive moments and shear forces at 1/4, 1/2 & 3/4 points.

 

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

 

N(-)Mu or N(-)M_Ed, LCB: Maximum factored negative moment occurring in the relevant member or section and the corresponding load combination.

 

x/d: Ratio of neutral axis depth to effective depth.

 

AsTop: The area of required top rebars calculated by the program. The larger of the calculated rebar area and the minimum

rebar quantity specified in the codes is presented.

 

Rebar(AsTop): The required number of rebars using the standard sizes specified by the user is presented.

 

When the reinforcing placement requires more than 2 layers, place the rebars up to the second layer. (Details...)

 

P(+)Mu or P(+)M_Ed, LCB: Maximum factored positive moment occurring in the relevant member or section and the corresponding load combination.

 

AsBot: The area of required bottom rebars calculated by the program. The larger of the calculated rebar area and the minimum

rebar quantity specified in the codes is presented.

 

Rebar(AsBot): The required number of rebars using the standard sizes specified by the user is presented.

 

When the reinforcing placement requires more than 2 layers, place the rebars up to the second layer.(Details...)

 

Vu, LCB: Maximum factored shear force occurring in the relevant member or section and the corresponding load combination.

 

AsV or Asw: Reinforcing steel section area (LengthUnit 2 / LengthUnit x 100 ) required for the shear force calculated by the program.

The larger of the calculated rebar area and the minimum rebar quantity specified in the codes is presented.

 

Stirrup: The required rebar spacing based on AsV using the standard sizes for sub-rebars entered by the user.

 

The following are displayed for Stirrup based on the automatic design results:(Details...)

 

T_Ed, LBC: Maximum factored torsional moment occurring in the relevant element or section and the corresponding load combination.

 

Ast,req, Ast,use:  Required transverse reinforcement or used transverse reinforcement for torsion.

 

Asl,req, Asl,use:  Required longitudinal reinforcement or used longitudinal reinforcement for torsion.

 

Rat-TV: Design ratio for combined effect of torsion and shear.

 

The following are displayed for Stirrup based on the automatic design res

 

 

 

Note

  is stipulated by IS456:2000 as follows:

 

 

Concrete Grade

M15

M20

M25

M30

M35

M40 and above

2.5  

2.8

3.1

3.5

3.7

4.0

 

 

Common Control

 

 

 : Display the applicable code for automatic design.

 

 : "Sorted by Member" displays the design results including the maximum factored negative and positive moments and shear forces extracted from all the load combinations at 3 sectional locations (I,M, & J).Display the design results by individual members.

 

Arrangement order is based on the 'Primary Sorting Option' shown below.

 

"Sorted by Property" displays the design results of the maximum factored negative and positive moments and shear forces by sectional locations representing all the members attributed to the relevant section property. Since the results do not pertain to a single member, MEMB (member number) is "0".

 

Once Property is selected, SEL controls all the members attributed to the same section properties.

 

 

 : Display the unit system selected by the user.

 : When automatic design results are produced by members, select an option whether to arrange the results on the basis of section numbers of member numbers in an ascending order.

 

 

: Update the rebar quantity for each property or member in the rebar design data in order to use for strength verification purposes.

 

When the design results are sorted by Property, rebar data will be updated in accordance with the most unfavorable design result among all the members attributed to the relevant section property.

 

When the design results are sorted by Member, rebar data will be updated by individual members.

 

 : 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 members attributed to the same sections are included. This option can be used even when the rebar splice data is changed.

 

Note

When modifying the design parameters ('Modify Concrete Material', etc.) that can affect all the design results, this option cannot be used since the design results will be deleted.

 

 : Display detail automatic design results

 

 : Display simplified automatic design results

 

 

 : Select the sectional location data to be included in the output.

 

 

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

 

Note

In all the Design Result Dialogs & Code Checking Result Dialogs, the Graphic Reports can be saved in a batch.

 

 

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

 

The design results "Sorted by Member" support the detail calculations.

 

 

 

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

 

The maximum forces calculated at each sectional location (I,M & J) are produced when "Sorted by Property" is selected, representing all the members of same properties.

 

 

 

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

 

 : Check in the option to select and highlight the selected members in Model View.

 

 : Close the dialog box.

 

 Revision of Gen 2014 (v1.1)

 

Q1. For Shear Design as per Eurocode2, the load combination being used for design is not the one with maximum shear force. Why?