Week 2 Challenge
1.1)
Aim - To assign Circular section to column -
Introduction -
1) Columns are defined as vertical load-bearing members supporting axial compressive loads chiefly.
2) This structural member is used to transmit the load of the structure to the foundation.
3) The factored axial compression stress considered all load combination relating to sesimic loads shall be
limited to 0.40 fck in all column .
4) The Minimum Column Dimension as per IS 13290-2016 = 20 db
wherer db = Max beam bar diameter
5) In column cracking will be much less as compared to beam because large amount of axial force is present
Procedure -
Step 1)
i) Create the model in the STAAD Pro
ii) Draw the Nodes at ( 0 ,0 , 0) and ( 0 , 10, 0) as shown below
iii) Join this nodes by using Add beam option
Step 2)
i) Now Click on Properties
ii) Select Define parameters
iii) Assign the Circular shape of the column ( 0.5 m radius)
iv) Click on Add
Step 3)
i) Now select the column and assign the properties by selecting Assign to selected beam option
Result - The Circular section to column is assigned sucessfully
1.2) How will you assign Unit system to a .std model file?
i) First of all, even if we have modelled in metric units, we can still get the data displayed in imperial units.
ii) To do that, we just need to:
iii) Go to View - Display Option and set appropriate units for Structure Units, Section Units, Force Units etc. as needed.
iv) The model data will then be displayed graphically in those units.
v) Also to ensure that any data going forward is entered in imperial units, we can:
vi) Go to Tools > Set Current Input Units and set the Length and Force units appropriately.
1.3) What are the parameters to be specified while using “Bay Frame” option?
i) To create the parameter of the design by Bay frame
ii) By clicking on the structural wizard option under Geometry tab
iii) Click frame model and the bay frame
iv) Enter the parameters like length, breadth, height
1.4) Name few codal standards incorporated in STAAD Pro software.
i) For steel the codal provision are IS 800, IS 800:2007 LSD , IS 800:2007 WSD
ii) For the concrete the codal provision are IS 456:2000 ,
iii) For Seismic IS 13920 and IS1893 :2016
iv) For Wind Load - IS 875 part 3
1.5) How will you specify the design compressive strength for a RCC section?
i) Go to the design option
ii) Click on the define parameter
iii) In the design parameter the FC (compressive strength) of RCC section is given as 25000 kN/m2
2.1) State the “Input” steps involved in RCC design.
Following are the Input Steps -
i) Geometry - The node location and the node spacing are given
ii) Properties - Specify the sectional properties of the section
iii) Input Section / Constant / Supports - The end support are to be given as per necessity
iv) Loads and Combination - Need to provide the loading pattern and the loading combination
v) Design Standards - Select the codes and parameters which you need to design
vi) Specify Analysis Type - Select the Analysis type
2.2) Explain the difference between Fixed and Enforced support condition in STAADPro.
i) When the FIXED or FIXED BUT type of support is specified, for those degrees of freedom which are to be treated as fully restrained,
ii) STAAD assumes the displacements to be known quantities whose value is zero.
iii) Hence, those degrees of freedom are not considered for the stiffness matrix, and their value is not calculated.
iv) For the FIXED BUT support type, if any degrees of freedom are assigned a spring using the KFX thru KMZ terms, those are treated as
unknowns and their displacements are calculated .
v) When the ENFORCED or ENFORCED BUT type of support is specified, for those degrees of freedom which are to be treated as restrained,
vi) STAAD assigns a spring with a very high spring stiffness - translational stiff springs for translational restraints, and
rotational stiff springs for rotational restraints.
vii) Those degrees of freedom which are free to displace are assigned springs of zero stiffness.
viii) Hence, for all the 6 degrees of freedom at such supports, the displacements are calculated.
ic)The ones which have a stiff spring will end up having a negligible displacement, and those with zero-stiffness-springs will have a displacement
based on the structure geometry, properties and loading.
3.1) Explain the steps involved in analysis of a model using STAAD Pro sequentially.
i) Select the Run Analysis tool in the Analysis group on the Analysis and Design ribbon tab.
ii) Click on Analysis Command
iii) Select type of Analysis which you want to perform
iv) Click on Add
v) Click on Run Analysis , If model has zero errors output will be generated .
3.2) Explain the two ways in which a structural framework/model can be created in STAAD Pro software.
The two ways to model the structural framework is:
i) Creating model by node to node
ii) Creating model by BAY frame using Structure Wizard option
3.3) Elaborate the different support conditions in STAAD Pro.
There are 5 types of support conditions that are predefined in the software
i) FIXED - All the transitional and rotational displacement are restrained
ii) PINNED: Transitional displacement are restrained but rotational moments are not restrained
iii) FIXED BUT: The fixed but support is similar to pinned support it allows us to provide the degree of freedom to view
the displacement either translation or rotational
iv) ENFORCED: When enforced supports are assigned to the structure the software allows the springs to itself and
the displacement can be calculated however there is no provision to provide the spring constant
v) ENFORCED BUT: The software assigns the spring itself with zero stiffness or high stiffness
3.4) How will you extract the stress distribution for a staircase slab?
i) Firstly define the nodes to the staircase design
ii) Then add beams
iii) Add plate/solid to represent the staircase slab
iv) Assign all the materials and design properties
v) Run the analysis
vi) After the analysis is done double click on the plate element to view the stress .
3.5) Explain the different ways to view SFD & BMD in STAAD Pro.
i) After completion of the design the STAAD Pro will automatically provide the BMD and SFD
ii) By entering to the post processing process,click on OK
iii) By clicking the beam results deflection command
iv) Reaction click the beam deflection
v) Click on Annotate - select Max BM you can see the value
vi) We see the SFD and BMD by graphically also
vii) For that Click on Layout - Select Graph - You can see tha SFD and BMD graphically too .
Practical -
A) Simply Supported Beam
a. A Simply supported beam with two point loads symmetrically placed
b. Span L = 20m
c. Load P = 50kN each
d. Both P located at 5m from each support
Aim - To create an Simply Supported Beam in Staad Pro
Procedure -
Step 1)
i) Open the Staad Pro Software
ii) Click on Analytical Modeling
ii) Name the File and Select Metric Units
iii) Click on Okay .
Step 2)
i) Once you click on Create
ii) Modal space of staad pro will open
Step 3)
i) Now Click on Grid - Beam Grid
ii) Specify the First Node point as (0,0,0)
iii) Copy that node and paste it at a distance of 20m in x direction (Length of beam )
Step 4)
i) Once nodes are creatd joined it by using Add beam option
Step 5)
i) Now we have to Assign the properties
ii) Click on Properties
iii) Click on Define
iv) Assume the size of beam (0.230 x 0.500) m
v) Click on Add
vi) Select the beam and Assign it .
Step 6)
i) Now we have to add Material
ii) Click on Material
iii) Select Concrete
iv) Select Assign to view
Step 7)
i) Now we have to assign simply supported supports
ii) Click on Supports
iii) Create supports and Assign to the nodes
Step 8)
i) Now we have to assign loads
ii) Point load is given as 50kn at a distance of 5m from each support
iii) For that Click on Loading
iv) Define load Cases
v) Add DL and LL
v) In DL self weight is structure will considered
vii) In LL click on Add - Select Member Load - Concentrated Load
vii) Enter load value as -50 Kn ( acting downward ) and give d1 = 5m
Similarly add next point load at a distance of 15m
viii) Assign both the loads to the beam
Step 9)
i) Click on Analysis
ii) Perform Analysis
iii) Click on Okay
Step 10)
i) Click on Design
ii) Select Concrete - IS 456
iii) Define parameters - Fc and Fymain
iv) Click on Command - Select - Design Beam
Step 11)
i) Click on Run Analysis
ii) Check the model
iii) Click on Go to Post Processing Mode
Result -The analysis of the simply supported beam is done for the given loading
i) BMD
2) SFD
2) Fixed Beam
a. Span L = 16m
b. Uniformly Distributed Load w=9kN/m
Step 1)
i) Open the Staad Pro Software
ii) Click on Analytical Modeling
ii) Name the File and Select Metric Units
iii) Click on Okay .
Step 2)
i) Once you click on Create
ii) Modal space of staad pro will open
Step 3)
i) Now Click on Grid - Beam Grid
ii) Specify the First Node point as (0,0,0)
iii) Copy that node and paste it at a distance of 16 m in x direction (Length of beam )
Step 4)
i) Once nodes are creatd joined it by using Add beam option
Step 5)
i) Now we have to Assign the properties
ii) Click on Properties
iii) Click on Define
iv) Assume the size of beam (0.230 x 0.500) m
v) Click on Add
vi) Select the beam and Assign it .
Step 6)
i) Now we have to add Material
ii) Click on Material
iii) Select Concrete
iv) Select Assign to view
Step 7)
i) Now we have to assign Fixed Supports
ii) Click on Supports
iii) Create supports and Assign to the nodes
Step 8)
i) Now we have to assign loads
ii) For that Click on Loading
iii) Define load Cases
iv) Add DL and LL
v) In DL self weight is structure will considered
vi) In LL click on Add - Select Member Load -uniform force
vii) Enter load value as -9 Kn/m ( acting downward )
viii) Assign the load to the beam
Step 9)
i) Click on Analysis
ii) Perform Analysis
iii) Click on Okay
Step 10)
i) Click on Design
ii) Select Concrete - IS 456
iii) Define parameters - Fc and Fymain
iv) Click on Command - Select - Design Beam
Step 11)
i) Click on Run Analysis
ii) Check the model
iii) Click on Go to Post Processing Mode
Results - The analysis of the simply supported beam is done for the given loading
1) BMD
2) SFD
