Week 2 Challenge

1. 1. How will you assign Circular section to column?

Aim and Introduction:

To assign a circular section to a column

Procedure:

Step 1- Create a new model for column

Step 2- Create the geometry firtst, enter the origin (0,0,0) for first node in node table

Step 3- since it is a column (vertical member) you should copy paste the 2 nd node in the Y direction

Step 4- Next specify the property as we want to select the cross section of the column since, it is circular column we want to provide diameter of the column

Step 5- click ok now the property for the column has been created now you can assign the property to the member

Now the circular column has been created.

Result:

The circular column has been created with the specification.

2. Unit system to a .std model file

Aim and Introduction:

To determine unit system to a staad file

Procedure:

We can assign the unit system for a model in two ways as in the initial stage of creating the model and also after

creating the initial model we can change the units with the menu options

method 1 you can choose the unit systems with which the model has to be created whether as a metric system or english unit system

method 2 while in middle of the modelling if you want to change the unit systems you can go to view display options

and change the units in your working model for your convinience

3. parameters to be specified while using “Bay Frame”

Aim and Introduction:

To determine the parameters specification while using bay frame options in structure wizard

Procedure:

structure wizard is an option provided by default in staad pro to create the model at an ease process

Goto--> Geometry ---> structure wizard ---> select frame models form the model type drop down list and select the Bay frame option

after selecting the option you want to input the parameters like length of the building , width, height, No of bays along the length, No of bays along the height, No of bays along the width as shwon in the image below

Result:

The parameters for the bay frame model has been successfuly given and the model has been genetrated as per the plan

4. codal standards incorporated in STAAD Pro software.

Aim and Introduction:

To determine the codes incorporated in staad.pro

Procedure:

As the codes are applied after the modelling and analysis of the structure

In the design part only we can select the codal standards, as few codal standards that incorporated in staad pro are as follows

1. Indian Standards

2. British standards

3. AISC srandards

4. Canadian standards

Result:

The standards incorporated in Staad are mentioned above and are determined

5. Design compressive strength for a RCC section.

Aim and procedure:

To specify the compressive strength of the RCC section.

Procedure:

After the analysis have been done we want to proceed further with the design of the RCC structures

In that case we want to define some parameters as Fc,Fy, Main, etc

Strength Fc is characteristic strenght of the concrete such as M20, M25, M30 etc..,

Another method we can change the compressive strength is using the command file, where we can directly change the FCu value in editor mode

Result:

The Compressive strength have been specified for RCC section.

2. 1. “Input” steps involved in RCC design.

Aim and procedure:

To determine the steps involved in RCC design.

Procedure:

Step 1: You need to prepare the geometry of the RCC structure.
Step 2. Then specify the properties for the structure for columns and beams.

Step 3. Then assign the materials to the structure in materials tab.
Step 4. After modelling and loading has been done Go to analysis and design tab define the analysis commands as per the structure and run the analysis.

Step 5. Finally go to design tab and defien the design parameters and code selected as per the country the strucutre is to be designed.

Step 6. Run the design command for RCC design of the structure

Result:

The input steps for RCC design have been determined

2. Fixed and Enforced support condition in STAADPro.

Aim and procedure:

To determine the difference between the Fixed and Enforced support condition

Explanation:

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.

When the ENFORCED type of support is specified, for those degrees of freedom which are to be treated as restrained, STAAD assigns a spring with a very high spring stiffness. Those degrees of freedom which are free to displace are assigned springs of zero stiffness. Hence, for all the 6 degrees of freedom at such supports, the displacements are calculated.

Result:

Difference between the Fixed and enforced suport condition have been determined.

3. 1. Steps involved in analysis of a model using STAAD Pro.

1. Geometry on the menu bar and geometry tab click on the strucutre wizard icon
2. frame model or bay type will be there which was provided by the staad by default
3. Select File > Merge Model with STAAD.Pro Model. A dialog prompts you to confirm you want to merge this prototype with your current STAAD.Pro model.
4. Click Yes.
5. Paste prototype model dialog box will open as below

3. different support conditions in STAAD Pro.

Aim and procedure:

To elobarate the different support conditions availabe in staad pro

Explanation:

There are different support conditons which are available in the staad pro they are,

Fixed support: fixed support can carry moment, vertical And horizontal reactions, the DOF in fixed support is 0

Pinned support: pinned support can only support vertical and horizontal reaction, DOF in pinned support is 1

Fixed but: type of support is specified, for those degrees of freedom which are to be treated as fully restrained with some displacements

ENFORCED or ENFORCED BUT type of support is specified, for those degrees of freedom which are to be treated as restrained, STAAD assigns a spring with a very high spring stiffness - translational stiff springs for translational restraints, and rotational stiff springs for rotational restraints

Results:

Hence defferent support conditions have been discussed with their respective conditions.

4. Stress distributution in staircase slab.

Aim and procedure:

To determine the stress distribution in staircase slab in staad pro

Explanation:

Create the nodes for the going slab and landing slab

After creating the nodes for going slab and landing slab assign the plates to the slabs either clockwise or anti clockwise

Goto properties and assign the properties for plate thickness

Generate the mesh for the plate as quadrilateral meshing and generate it.

apply the loads and perform the analysis

after analysis part define the design parameters for design and run the analysis

Go to --> Results --> plate results --> Diagram dialog box ---> Plate stress contour --> slect the load case for the combination and stress type as maximum absolute ---> click apply to view the stress contours for the staircase slab.

Result:

Hence the stress distribution for the staircase has been determined

5. SFD & BMD

Aim and procedure:

To view the SFD & BMD in different ways.

Procedure:

First you must Analyze the file. Select Analyze from the Staad.Pro top menu bar. Select the Analysis option. After this, click on Run Analysis at the bottom of the small window dialog box.

After the analysis of the file is completed, click on the Done button.

Next, we go to the Post Processing mode to view the forces and results graphically.

To enter into the Post Processing mode, select Mode from the top menu bar and select Post Processing. Remember that if your analysis is not complete, you will not be able to access the Post Processing mode.

By default, the deflection diagram always opens up in the post processing screen of Staad.Pro.

To view the Bending Moment Diagrams, select the Beam page from the left side. From the top menu bar, choose Results - View value. Under Ranges, choose All. (The All button means the Bending moment diagram will be displayed for all members.)

Under the Beam Results tab, you will see the options Bending, Shear, Axial, Displacement and Stresses.
Make the appropriate choice.

Click on the Annotate button. Then click on the close button.

Here are a group of of other options to view BMD, SFDs

To view the bending moment diagram for individual members you may go to the Beam > Graphs page on the left and click on any member and the BMD, SFD and axial force diagrams for the member would be displayed on the right.

Alternately you may also double click on any member to bring up the query box and go to the Shear Bending tab to see the bending moment or shear force diagrams for that member.

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

Aim & Introduction:

to create a 20m with two point loads

Procedure:

Step 1: Create a geometry for a beam of span 20m as shown below

Step 2: create a support specifications which satisfies the SS condition using fixed but condition

As for SS condition we need to restrain Fx and Fy alone and of roller support we want to restrain Fy on the other end as shown above image

Step 3: Analyse the beam by adding perform analysis command

Step 4: now we can see the SF and BM from the beam results from post processing results

SFD

BMD

B.Fixed Beam

Aim & Introduction:

to create a 16mwith UDL

Procedure:

Step 1: Create a geometry for a beam of span 16m as shown below

Step 2: create a support specifications which satisfies the Fixed condition using Enforced but condition.

As for fixed condition we need to restrain Fx, Fy & Mz for both end as shown above image

Step 3: Analyse the beam by adding perform analysis command

Step 4: now we can see the SF and BM from the beam results from post processing results

Results:

Hence the SS and fixed beam have been analysed for two different conditions with udl and tow point loads have been analysed