Lecture 2 Visual Analysis

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Lecture 2 - Visual Analysis

• January 16, 2002
• CVEN 444

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Lectures Goals

• Introduction to Visual Analysis
• Setup programs

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Visual Analysis
VisualAnalysis is a full-featured finite element
analysis package designed specifically for
structural engineers. VisualAnalysis was written
from the ground up to take advantage of the
Windows operating environment, and adheres to
the standard look and feel that Windows
programs provide. Ease of use was a major design
goal for VisualAnalysis, yet the ultimate purpose
was to make complex structural analysis
accessible and intuitive.
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Visual Analysis - Example

• Consider the following example problem.
• The simple frame is fixed setup.
• The example comes from the VisualAnalysis set of
  programs, which can be checked.

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Visual Analysis Example
Begin the project by starting VisualAnalysis. Star
t the project as a new project.
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Visual Analysis - Example 1

• The following set of slides will appear.
• Type of structure
• 2D structure
• 3D structure

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Visual Analysis - Example 1

• The following set of slides will appear.
• Modal type of structure
• Frame,shear wall, etc.
• Trusses
• Grids, floors roofs, slabs, etc.
• General Load Cases

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Visual Analysis - Example 1

• General set of information
• Project title
• Company
• Your name

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Visual Analysis - Example 1

• Set up of preferred units
• Force (kips)
• Length
• angle (degrees, radians)
• Temperature

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Example 1 - Visual Analysis

• The program will generate a grid for creating the
  frame.
• Select a starting point to create your frame.
  Select the member button at the top. Press on
  the left mouse button and hold to create a
  member.

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Example 1 -Visual Analysis

• Create a 15 ft section. You will find a
  coordinate display in the lower right hand
  corner.
• Double click on the member and a member character
  will appear on screen. You can select materials,
  shape properties, and orientation.

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Example 1 -Visual Analysis

• Go to the shape section, select category and
  change to AISC. Select a W12 x 87 from the group
  and section.

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Example 1 -Visual Analysis

• Repeat the procedure for the 18 ft section and
  the other 15 ft section.
• Double click on the 18 ft section and change the
  section to a W14 x 30.

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Example 1 - Visual Analysis

• Double click on the nodes at the bottom of the
  frame. You will want to set the boundary
  conditions.

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Example 1 - Visual Analysis

• The nodal menu will come up and you will want to
  select the Support section. Select a fixed
  support type. Notice that you have other types
  of support types. Red colored forces indicate
  there will be forces there. Declare both
  supports.

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Example 1 - Visual Analysis

• Create an applied set of forces acting on the
  frame.
• Go to the top, click on Model and create a New
  Service Case.

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Example 1 - Visual Analysis

• Declare the load case, Live Loads. Select the
  source as live load. Click OK.

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Example 1 - Visual Analysis

• Select the member and select Applied Member
  Force from the main menu.
• A new menu will appear with type of force
  magnitude and placement.
• Select a uniform distributed load in the Y
  direction with a magnitude -0.5 k/ft.

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Example 1 - Visual Analysis
The resulting image will be
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Example 1 - Visual Analysis

• Repeat the procedure and create a second load
  case. Titled Wind Loads and declare the source
  wind loads.
• Click on the node and bring up the main menu and
  select Nodal Loads Select 10 k in the X
  direction.

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Example 1 - Visual Analysis
The resulting image will be
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Example 1 - Visual Analysis

• Create an equation which will include both loads.
  Select the Model menu and create an
  equation. An new menu will appear. Declare
  the equation, LLWL.

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Example 1 - Visual Analysis

• Select the live and wind loads and click on the
  live load factor of 1.00 and change it to 1.6.
  You have created a set of three loads cases.

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Example 1 - Visual Analysis

• Click on the Analysis key,
• A series of menu will appear.
• Type of analysis
• Static Analysis
• Dynamic Analysis
• Select a static analysis and type OK.

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Example 1 - Visual Analysis

• A series of menu will appear.
• Next menu is type of static analysis.
• First order
• Member Unstable and frame unstable.
• Select first order.

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Example 1 - Visual Analysis

• Select the load cases you want to analysis.
  Choice all of the cases and press Finish

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Example 1 - Visual Analysis
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Example 1 - Visual Analysis
You can create the shear and bending moment
diagrams using the graphical representation from
the main menu.
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Example 1 - Visual Analysis
Visual analysis can generate a customize report
for the frame.
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Visual Analysis

• The reports can be adjusted by using the main
  menu. The reports can be a verbose or as sparse
  as you need. You can use it to load shear and
  bending moments, axial loads, deflections and
  slopes.
• One other program, which is used for concrete, is
  SAP 2000.

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Homework

• Using Visual Analysis work through Dr. Lowerys
  example problems. (http//stommel.tamu.edu/esandt
  /Teach/Spring00/CVEN345/visual_analysis.html)
• Basic Case
• Advance Case
• For both cases, find the reactions and the
  deformed shape of the frame. Plot the shear and
  bending moment diagrams for the frame