Autodesk Robot Structural Analysis Professional

Autodesk Robot Structural Analysis Professional
®
Autodesk
™
Robot Structural Analysis
Professional
VERIFICATION MANUAL
FOR STEEL MEMBERS DESIGN
March 2014
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Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in FAR 12.212 (Commercial Computer Software‐Restricted Rights) and DFAR 227.7202 (Rights in Technical Data and Computer Software), as applicable. RUSSIAN CODE SP 16.13330.2011 MOSCOW 2011 ...................................................................................................................1 INTRODUCTION ..............................................................................................................................................................................2 GENERAL REMARKS ..................................................................................................................................................................3 VERIFICATION PROBLEM 1 DESIGN OF MEMBERS FOR COMPRESSION ......................................................................................6 VERIFICATION PROBLEM 2 LATERAL-TORSIONAL BUCKLING OF BEAMS ..................................................................................15 VERIFICATION PROBLEM 3 COMBINED COMPRESSION AND BENDING ABOUT BOTH AXES .........................................................25 March 2014
page i
Russian code SP 16.13330.2011
Moscow 2011
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
INTRODUCTION
This verification manual contains numerical examples for elements of steel structures prepared and
originally calculated by Autodesk Robot Structural Analysis Professional version 2015.
Each problem contains the following parts:
- title of the problem
- specification of the problem
- Robot solution of the problem
- outputs with calculation results and calculation notes
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
GENERAL REMARKS
If you make first step in Robot program you should select preferences corresponding to your example
using “Preferences…” or “Job Preferences…” (click Tools).
A.
Preferences
To specify required regional preferences click Tools / [Preferences...] and in default opened
Preferences dialog box select in combo boxes a needed country (region) and
working / printout language.
B.
Job Preferences
To specify required job preferences click Tools / [Job Preferences...] and in default opened
Job Preferences dialog box select preferences corresponding to your structure example
at the left list view and appropriate combo boxes. Below there is a screenshot showing the
selection [Design codes] :
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
You can create a new Job Preferences with arbitrarily chosen options and parameters ( standards,
materials, databases, load codes etc.) appropriate for required condition under a new name
to make it easier for future work .
In that case choose proper detailed data from [Configuration of Code List] dialog box which is
opened after pressing [More codes…] button and e.g. looks as shown below :
If you pick Load combinations from Codes combo box the new list view appears:
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Set a selected code on the right list of the box using arrows than press it as the current code .
Press OK.
After the job preferences decisions are set, type a new name in combo box ,e.g.
“ new Russian code” and save it pressing Save Job Preferences icon placed on the top
of [Job Preferences] dialog box. It opens Save Job Preferences dialog box which you should accept
pressing OK.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
VERIFICATION PROBLEM 1
design of members for compression
File: SP16_ex_Compression.rtd
TITLE:
Example 1.
I-Shape
Compressed Column Verification
SPECIFICATION:
Select a C255 (Ry = 240 MPa) I DDSH 40x1 bar to carry an axial dead load of 622 kN and
live load of 1800 kN. Assume the design member is 9 m long, is pinned top and bottom in both axes
and is laterally braced about the z-z axis at the midpoint.
Verify the strength of a defined compression member .
SOLUTION:
You must remember to specify appropriate gm material factor (a new option) in CONFIGURATION
dialog box placed at Steel/Aluminium Design level.
In DEFINITIONS dialog box define a new type of member, laterally braced about the z-z axis
at the midpoint . It can be set in Member type combo-box.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Pre-defined type of member “Column” may be initially opened.
For a chosen member type press the Parameters button on Members tab
which opens - here - “Column” MEMBER DEFINITION–PARAMETERS dialog box.
Type a new name in the Member type editable field. Change parameters to meet initial data
requirements of a structure in a current task. In this particular compression case define buckling z-z
parameters. Press Buckling length coefficient Z icon which opens BUCKLING DIAGRAMS dialog box.
Click a last icon.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
The new dialog box INTERNAL BRACING will appear with active Buckling Z tab .
In Buckling Z tab define internal support in the middle of the member by typing relative value 0.5
for marked Define manually coordinates of the existing bracings field.
Press OK.
Save the newly-created member type under a new name, e.g. “0,5 Lz bracing” :
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Number of the member must be
assigned to appropriate name
of Member type.
( It is very important when you verify
different member types.)
In the CALCULATIONS dialog box set for this task:
 Verification option  Member Verification
 Loads cases  1 to 4
 Limit state  only Ultimate Limit state will be
analyzed so switch off Limit stat Serviceability
 Material factor  gm =1,025 ;
the “1,025” radio button is switched on by default
in CONFIGURATION dialog box (opened by
[Configuration] button)
 Limit slenderness  for “Main columns” on
[Compression] tab ;
radio button selected in LIMIT SLENDERNESS
VALUE dialog box which is opened by [Define]
button placed in CONFIGURATION dialog box
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Now, start calculations by pressing Calculations button.
MEMBER VERIFICATION dialog box with most significant results data will appear on screen.
Pressing the line with results for the member 1 opens the RESULTS dialog box with detailed results
for the analyzed member. The views of the RESULTS windows are presented below.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Simplified results tab
Detailed results tab
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Pressing the [Calc.Note] button in “RESULTS –Code” dialog box opens the printout note for
the analyzed member. You can obtain Simplified results printout or Detailed results printout .
It depends on which tab is active .
The printout note view of Simplified results is presented below.
a) In the first calculation step DDSH 40x1 section was considered. The results are presented
below.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
b) From economical reason try to check a lighter I-section.
Being still in RESULTS- CODE dialog box, delete number of DDSH or type DB section symbol
in the editable field below a drawing of a section and select DB55x2. Press ENTER.
Calculations (and results) are refreshed instantly.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
The results in the form of a “Calculation Note” for the new selected section are presented below.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
VERIFICATION PROBLEM 2
Lateral-torsional buckling of beams
File: SP16_ex_LTB beam.rtd
TITLE:
Example 2.
I-Shape Flexural Member Design in Strong-Axis Bending Braced at Midspan
SPECIFICATION:
Verify the strength of the C345 I DB50x1 beam with a simple span of 10.67m. The beam
is braced at the ends and center point. The nominal loads are a uniform dead load of 5,0 kN/m
and a uniform live load of 8,0 kN/m.
SOLUTION:
In DEFINITIONS dialog box define a new type of member, torsional and laterally braced upper flange
about the z-z axis at the midpoint. It can be set in Member type combo-box.
Pre-defined “beam” member type may be initially opened.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
For chosen member type press the [Parameters ] button on Members tab.
It opens MEMBER DEFINITION–PARAMETERS dialog box.
Type a new name in the Member type editable field. Then, change parameters to meet initial data
requirements of the structure. In this particular bending case set the following lateral-buckling
parameters :
 switch on Lateral buckling

select upper load level by pressing proper icon

define appropriate load type by pressing “ load “ icon which opens LOAD TYPE dialog box;
for this task the first icon “uniform loads“
was selected.

define adequate bracings for Lateral buckling .
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
To define Lateral buckling length coefficient for this structure press Upper flange button.
It opens LATERAL BUCKLING LENGTH COEFFICIENTS dialog box.
Click the last icon Intermediate bracings. The new dialog box INTERNAL BRACINGS will appear
with automatically active Lateral buckling - Upper flange tab .
In INTERNAL BRACINGS dialog box there are possibilities of defining independent bracings for
buckling and lateral buckling of the marked member type.
In Lateral buckling-upper flange tab define internal support in the middle of the member by typing
typing relative value 0.5 for marked Define manually coordinates of the existing bracings field.
Press OK.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
By pressing [Service] button at
MEMBER DEFINITION–PARAMETERS
dialog box open SERVICEABILITYDISPLACEMENT VALUES dialog box in
which limit dispalcements should be
defined.
Save the newlycreated member type
under a new name ,
e.g. as “LB 0,5l up”
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Number of a member must be
assigned to the appropriate name
of Member type.
It is very important when you verify
different member types.
In the CALCULATIONS dialog box set for this task :
 Verification option  Member Verification
 Loads cases  no 3 and no 11
 Limit state  Ultimate and Serviceability Limit state
will be analyzed so switch on both check boxes
 Material factor  gm =1,025 ;
the “1,025” radio button is switched on by default in
CONFIGURATION dialog box (opened by
[Configuration] button)
 Limit slenderness  “Defined by the user ” on
[Compression] tab (radio button selected in LIMIT
SLENDERNESS VALUE dialog box which is
opened by [Define] button placed in
CONFIGURATION dialog box)
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Now, start verifications by pressing [Calculations] button.
MEMBER VERIFICATION dialog box with most significant results data will appear on screen.
Pressing the line with general results for the member 1 opens the RESULTS dialog box with
detailed results for the analyzed member. The view of the RESULTS windows are presented below.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Simplified results tab
Displacements results tab
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Detailed results tab
Pressing the [Calc.Note] button in “RESULTS –Code” dialog box opens the printout note for
the analyzed member. You can obtain Simplified results printout or Detailed results printout .
It depends on which tab is active .
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
The printout note view of Simplified results is presented below.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
For comparison the simplified results for the unbraced beam, no 2 , are presented below.
Simplified results tab
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
VERIFICATION PROBLEM 3
combined compression and bending about both axes
File: SP16_ex_Nc_My_Mz.rtd
TITLE:
Example 3.
I-shape Subjected to Combined Compression and Bending About Both Axes
SPECIFICATION:
Verify if an C275 I DSZ_50x1 bar has sufficient available strength to support the axial forces and
moments listed below. The unbraced length is 7,70m and the member has pinned ends:
Lefy = Lefz = Lef,b = 7,70 m
section internal forces
Nc = 800 kN
My = 400 kNm
Mz = 30 kNm
Material Properties:
C275
Ry = 270 MPa , Ru = 370 MPa
SOLUTION:
For a considered task define manually a new type of member in DEFINITIONS dialog box. It can be
set in Member type combo-box.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Pre-defined type of member “simple bar” may be initially opened.
For a chosen member type click the [Parameters] button on Members tab.
It opens MEMBER DEFINITION–PARAMETERS dialog box.
Type a new name in the Member type editable field. Then change parameters to meet initial data
requirements of the current structure. For this particular task for a bar subjected to a combined loads
Nc +My+Mz case :

define buckling parameters - press Buckling length coefficient Y icon which opens
BUCKLING DIAGRAMS dialog box and select non-sway structure radio button
and the first icon with buckling length coefficient Y equal 1,0 ;
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Do the same for the z-z direction.

switch on Lateral buckling

select required load level by pressing a proper icon

select appropriate load type by pressing a “ load “ icon which opens LOAD TYPE dialog
box;
For this task the first icon “uniform
loads“ was selected.
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design

define parameters required for member stability verification - press [More…] button
which opens MEMBER DEFINITION-ADDITIONAL PARAMETERS dialog box and click
currently shown “Bending moments for stability analysis” icon ;
In the newly opened MOMENTS FOR CALCULATIONS OF MEMBER STABILITY dialog
box select a needed scheme icon ;
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Save the newly-created member type
under a new name, e.g. “LTB”.
MEMBER DEFINITION–
PARAMETERS dialog box defined
for this verifications looks like:
In DEFINITIONS dialog box
number of the member must be
assigned to the appropriate name
of Member type.
( It is very important when you verify
different member types).
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
In the CALCULATIONS dialog box set for this task :
 Verification option  Member Verification
 Loads cases 
no 1
 Limit state  only Ultimate Limit state will be
analyzed so switch off Limit stat Serviceability.
And in CONFIGURATION dialog box opened by
[Configuration] button :
 Material factor  gm =1,025 ;
the “1,025” radio button is switched on by default
 Limit slenderness  “Defined by the user ” on
[Compression] tab - radio button selected in LIMIT
SLENDERNESS VALUE dialog box which is opened
by [Define] button .
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Now, start verifications by pressing [Calculations] button.
MEMBER VERIFICATION dialog box with most significant results data will appear on screen.
Pressing a line with results for the member 1 opens the RESULTS dialog box with detailed results for
the analyzed member. The view of the RESULTS windows are presented below.
Simplified results tab
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
Detailed results tab
Pressing the [Calc.Note] button in “RESULTS –Code” dialog box opens the printout note for
the analyzed member. You can obtain Simplified results printout or Detailed results printout.
It depends on which tab is active .
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Autodesk Robot Structural Analysis Professional - Verification Manual for Steel Members Design
The printout note view of Simplified results is presented below.
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