Structure Design

Code LRFD:2000

Structure design / Steel/Aluminum design

Selects the STEEL/ALUMINUM DESIGN layout from the list of available Robot Millennium layouts.

In the Groups tab located in the

Definitions dialog box press the

New button

Starts defining a new group.

Define the first group with the following parameters:

Number: 1

Name: Upper chords

Member list: LMC on the View edit viewer; select all the bars of the upper chords while the CTRL key is pressed

Material: STEEL Carbon Fy 36 ksi

Defines the first group consisting of all bars belonging to the upper chords in the structure.

Save Saves the parameters of the first member group. LMC the New button on the Groups

tab in the Definitions dialog box

Allows defining a second member group.

Define the second group with the following parameters:

Number: 2

Name: Lower chords

Member list: LMC on the View edit viewer; select all the bars of the lower chords while the CTRL key is pressed

Material: STEEL Carbon Fy 36 ksi

Defines the second group consisting of all bars belonging to the lower chords in the structure.

Save Saves the parameters of the second member group. LMC the New button on the Groups

tab in the Definitions dialog box

Allows defining a third member group.

Define the third group with the following parameters:

Number: 3 Name: Diagonals

Member list: LMC on the View edit viewer; select all the diagonals belonging to the trusses while the CTRL key is pressed

Material: STEEL Carbon Fy 36 ksi

Defines the third group consisting of all diagonals belonging to trusses in the structure.

Save Saves the parameters of the third member group. LMC the New button on the Groups

tab in the Definitions dialog box

Allows defining a fourth member group.

Define the fourth group with the following parameters:

Number: 4 Name: Bracing

Member list: LMC on the View edit viewer; select all the bracings in the structure while the CTRL key is pressed

Material: STEEL Carbon Fy 36 ksi

Defines the third group consisting of all bracings in the structure.

Save Saves the parameters of the fourth member group. LMC the New button on the Groups

tab in the Definitions dialog box

Allows defining a fifth member group.

Define the fifth group with the following parameters:

Number: 5 Name: Beams

Member list: LMC on the View edit viewer; select all cross beams while the CTRL key is pressed

Material: STEEL Carbon Fy 36 ksi

Defines the fifth group consisting of all cross beams in the structure.

Save Saves the parameters of the third member group. In the Calculations – LRFD:2000

dialog box switch on the Code Group

Design option

Activates design in groups.

LMC on the List button in the Code

group design line in the Calculations

dialog box

Opens the Code Group Selection dialog box.

Press the All button located in the upper part of the Code Group

Selection dialog box.

In the field below the All button the list: 1to5 will appear

Close

Selects member groups to be designed, closes the Code

Group Selection dialog box.

In the Calculations – LRFD:2000 dialog box switch on the Optimization option

The option allows determining parameters of calculations performed for member groups taking the optimization options into account.

LMC the Options button Opens the Optimizations Options dialog box. In the Optimization Options dialog

box switch on the Weight option

Activation of this option will result in searching for the lightest section in the group of sections that meet the code- defined criteria.

OK Closes the Optimization Options dialog box.

LMC the Load Case Selection button in the Calculations dialog box

Opens the Load Case Selection dialog box.

LMC the All button (in the field above the Previous button), the list: 1to8 13to16 will appear there, Close

Selects all load cases.

Activate the Ultimate option in the

Limit State field

LMC the Calculations button Starts design of the selected member groups; the Short

Results dialog box appears on the screen (see the drawing

LMC the Change All button in the

LRFD:2000 - Code Group Design

dialog box shown above

Changes the currently used sections of the members belonging to all member groups to the calculated sections:

-

for Upper Chords from S 15x50 to S 18x54.7,

-

for Lower Chords from S 15x50 to S 6x12.5,

-

for Diagonals from S 15x50 to S 18x54.7,

-

for Bracings from DL 2x2x0.25 to DL 4x4x0.25

-

for Beams from MC 12x50 to MC 8x21.4

Close Closes the Code Group Design dialog box.

Recalculates the structure with the changed member sections

LMC the Calculations button in the

Calculations dialog box

Starts design of the selected member groups; the Short

Results dialog box appears on the screen (see the drawing

LMC the Change All button in the

LRFD:2000 - Code Group Design

dialog box shown above

Changes the currently used sections of the members belonging to all member groups to the calculated sections:

-

for Upper Chords - without changes,

-

for Lower Chords from S 6x12.5 to S 4x7.7,

-

for Diagonals - without changes,

-

for Bracings from DL 4x4x0.25 to DL 4x4x0.312,

-

for Beams from MC 8x21.4 to MC 6x15.1

Close Closes the Code Group Design dialog box.

Recalculates the structure with the changed member sections

LMC the Calculations button in the

Calculations dialog box

Starts design of the selected member groups; the Short

Results dialog box appears on the screen (see the drawing

Close Closes the Code Group Design dialog box. Close the Member Verification and

the Results dialog boxes

Member Verification

In the Calculations - LRFD:2000 dialog box switch on the Code Group

Verification option

Activates the code group verification option.

LMC in the List button in the Code

Group Verification option

Opens the Code Group Selection dialog box.

Press the All button located in the upper part of the Code Group

Selection dialog box.

In the field below the All button the list: 1to5 will appear, Close

Selects member groups to be designed, closes the Code

Group Selection dialog box.

LMC the Load Case Selection button in the Calculations dialog box

Opens the Load Case Selection dialog box.

LMC the All button (in the field above the Previous button), the list: 1to8 13to16 will appear, Close

Selects all load cases.

LMC the Calculations button in the

Calculations dialog box

Starts code group verification of selected member groups; the Short Results dialog box appears on the screen (see the drawing below).

Close Closes the Code Group Verification dialog box.

8.4 Time History Analysis

In document Robot Training Manual Eng 190 (Page 116-122)