Week 2 Challenge
AIM:- To explain the answer for each and every question from 1.1.1 to 3.1.5.
INTRODUCTION:- In this section of question from 1.1.1 to 3.1.5, I used staad.pro software to answer these question. Besides this, I have used some reference from recorded video session of skill-lync.
PROCEDURE:- Here first I will mention question one by one then answer then in the same manner.
Question- 1. 1. How will you assign Circular section to column?
Ans= First open staad software and provide details
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 as circular column of 0.5m radius.
iii) Assign the Circular shape of the column ( 0.5 m radius)
Click to render view for 3d view
Question- 1.2. How will you assign Unit system to a .std model file?
Ans=
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.
Question- 1.3. What are the parameters to be specified while using “Bay Frame” option?
Ans= Those parameters are length, bredth, height, number of bays along length, number of bays along width.
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.
Question- 1.4. Name few codal standards incorporated in STAAD Pro software.
Ans= There are various codal provisions in staad which are incorporated as per different country standards. However, I will discuss only about Indian standards over here for different material design.
- For steel the codal provision are IS 800, IS 800:2007 LSD , IS 800:2007 WSD
- For the concrete the codal provision are IS 456:2000.
- For Seismic IS 13920 and IS1893 :2016
- For Wind Load - IS 875 part 3.
Question- 1.5. How will you specify the design compressive strength for a RCC section?
Ans=
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 30000 kN/m2.
Question- 2.1. State the “Input” steps involved in RCC design.
Ans=
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 and choose the material as concrete.
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. I will select IS-456. Then select characteristic compressive strength, yield strength of rebar, clear cover, main reinforement dia etc.
vi) Design command- Then click on commands and select type of design like- beam design or column design or slab design etc.
vii) Specify Analysis Type - Select the Analysis type.
Question- 2.2. Explain the difference between Fixed and Enforced support condition in STAADPro.
Ans=
Fixed Support:-
When the Fixed type of support is specified, for those degrees of freedom which are to be treated as fully restrained, Staad assumes the displacements to be known quantities whose value is zero. Hence, those degrees of freedom are not considered for the stiffness matrix, and their value is not calculated.
Enforced Support:-
When the enforced type of support is specified for those degrees of freedom which are to be treated as restrained, Staad assigns a springs for transitional restraints, and rotational stiff springs for rotational restraints. Those degrees of freedom which are free to displace are assigned springs of zero stiffness. Hence, for all the six degrees of freedom at such supports, the displacements are calculated. 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.
Question- 3.1.1. Explain the steps involved in analysis of a model using STAAD Pro sequentially.
Ans=
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 .
Question- 3.1.2. Explain the two ways in which a structural framework/model can be created in STAAD Pro software.
Ans=
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-
Question- 3.1.3. Elaborate the different support conditions in STAAD Pro.
Ans=
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.
Question- 3.1.4. How will you extract the stress distribution for a staircase slab?
Ans=
i) Firstly define the nodes to the staircase design
ii) Then add beams
iii) Then add Support condition.
iv) Add material properties, add plate/solid to represent the staircase slab.
v) Define and assign load and load cases accordingly.
v) click Analysis command and add preferred type of analysis.
vi) Run the analysis.
vii) After the analysis Go to post processing Mode and click to plate result click to plate stress and then one new tab will appear. after that click to Maximum absolute stress.
vii) Final result of plate stress.
Question- 3.1.5. Explain the different ways to view SFD & BMD in STAAD Pro.
Ans=
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 .
RESULT:-
All the qusestions from 1.1.1 to 3.1.5 are answered with detailed elaboration.
Practical
1. Analyze the following structural elements and validate the results
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 anlyze a simply supported beam of 20m length having two 50KN point load in 5m distance from end at both side. Also I will provide the analysis results as the SFD and BMD and dipacement.
INTRODUCTION:- I used staad.pro connect edition to execute this task. I have created a staad file for this project. Also, I mentioned each and every steps with screenshot attachment.
PROCEDURE:- I will mention each and every steps-
DETAILED PROCEDURE FOR-
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
STEP-1:-
First open the staad.pro software and fill all the project details and select unit system as Metric. Then select the model as analytical.
Then click to create.
STEP-2:-
Go to geometry add node then go to node cursor, copy and paste it to 20m in x direction
STEP-3:-
STEP-4:-
Go to property tab and define concrete beam. I assumed a rectangular beam of size 300mm X 400mm. After define click to add.
STEP-5:-
Then click assign to view and click yes
STEP-6:-
Go to Support tab and create simply support (Pinned support) and add it. Then assign it.
STEP-7:-
Then go to loading tab and click to add and then create dead load and live load case. After that create a load combination.
STEP-8:-
Under Dead load case click to add then add selfweight
STEP-9:-
Right click and click insert node and put value 5m in X direction and click add new point. Again Right click and click insert node and put value 15m in X direction and click add new point
STEP-10:-
Then click to Live load case and click to add. Then go to member load > Nodal load and input the data as -50KN under Y axis,Finally assign both selfweight and nodal load.
STEP-11:-
Then go to utility tab and click to command file and change the file from space to plane and save it.
STEP-12:-
Go to analysis tab and click to analysis and select perform analysis.
Then click to run analysis
STEP-13:-
Go to Post processing mode and select combined load case
STEP-14:-
Then go to beam result tab and select shear force
Then go to annotate and select values to be displayed
RESULT:-
Shear Force diagram-
Bending Moment diagram-
Displacement diagram-
Practical
1. Analyze the following structural element and validate the results
B.Fixed Beam
a. Span L = 16m
b. Uniformly Distributed Load w=9kN/m
ANS=
AIM:- To anlyze a fixed beam of 16m length having uniformly distributed load of 9 KN/m. Also, I will provide the analysis results as the SFD and BMD and dipacement.
INTRODUCTION:- I used staad.pro connect edition to execute this task. I have created staad file for this project. Also, I mentioned each and every steps with screenshot attachment.
PROCEDURE:- I will mention each and every steps-
DETAILED PROCEDURE FOR-
B.Fixed Beam
a. Span L = 16m
b. Uniformly Distributed Load w=9kN/m
STEP-1:-
First open the staad.pro software and fill all the project details and select unit system as Metric. Then select the model as analytical.
STEP-2:-
Go to geometry add node then go to node cursor, copy and paste it to 16m in X direction
STEP-3:-
STEP-4:-
Go to property tab and define concrete beam. I assumed a rectangular beam of size 300mm X 400mm. After define click to add.
STEP-5:-
Then click assign to view and click yes
STEP-6:-
Go to Support tab and create fixed support and add it. Then assign it.
STEP-7:-
Then go to loading tab and click to add and then create dead load and live load case. After that create a load combination.
STEP-8:-
Under Dead load case click to add then add selfweight
STEP-9:-
Then click to Live load case and click to add. Then go to member load > Uniform force and input the data as -9 KN/m under Y axis,Finally assign both selfweight and nodal load.
STEP-10:-
Finally assign both selfweight and UDL.
STEP-11:-
Then go to utility tab and click to command file and change the file from space to plane and save it.
STEP-12:-
Go to analysis tab and click to analysis and select perform analysis.
Then click to run analysis
STEP-13:-
Go to Post processing mode and select combined load case
STEP-14:-
Then go to beam result tab and select shear force.
Then go to annotate and select values to be displayed
RESULT:-
Shear Force diagram-
Bending Moment diagram-
Displacement diagram-
CONCLUSION:-
All the results have been displayed and two stad files are attached for practical questions. Also, I have attached other staad file for stair design.