WEST POINT BRIDGE:
How do we design the best bridge? Let's go on an Information Hunt, looking for clues.
Find the words and definitions in West Point Bridge Design HELP and fill in the blanks below.
1. Click on HELP. Then select Help Topics.
2. You can type the word you’re looking for, or scroll down. Once you see the word, double click on the word you want to look up.
A. Materials:
1. Look up materials. List the 3 different types of materials
2. Scroll down to Notes and Tips. Read the section.
List strength and expense for each type of material.
3.
Type of material | Strength (weak to strong) | Cost (least to most) | |
1. | Carbon Steel | 1 | 1 |
2. | High Strength Low Alloy Steel | 2 | 2 |
3. | Quenched and Tempered Low-Alloy Steel | 3 | 3 |
B. Cross-Sections
- Go back to Index. Look up cross-section. Choose Cross-Section from menu. List the 2 different types of cross sections.
- Go back to Index. Look up cross-section. Choose the line that names the 2 cross section types. from the menu.
- Look for the boxes that describe when it is most economical to use each type of cross section.
Type of cross section | Better to use for: (tension or compression) | Shown as what color (blue or red) |
Hollow | Compression | red |
Solid | Tension | blue |
C. Engineering Design Process: What are the steps?
- Go back to Index. Look up engineering design process. Choose The Engineering Design Process from the menu.
- List the 7 steps.
- Identify the problem
- Define the problem
- Develop alternative solutions
- Analyze and compare alternative solutions
- Select the best alternative
- Implement the solution
- Evaluate the results
How do we optimize our bridge design?
Let's go on an Information Hunt, looking for clues.
A. Find the How to Design a Bridge page from the help index. What is the objective?
to create an optimal bridge design
B. Go to each step of the Design Process flowchart. Read about the step, especially the Notes & Tips section. Enter one important fact from each step.
¨ Select a Site Configuration
Bridges on a river will cost considerably more than a bridge built over ground
¨ Decide on a Truss Configuration
The configuration must be stable
The configuration must be stable
¨ Draw Joints
Joints can only be placed on snap points.
¨ Draw Members
Must be on drawing board mode.
¨ Load Test Your Design
Check your model for stability
¨ Strengthen All Unsafe Members
Use different materials that may be stronger
¨ Optimize the Member Properties
Minimize the material cost.
¨ Optimize the Shape of the Truss
Triangles are a strong shape
¨ Find the Optimum Truss Configuration
Try reducing the number of joints
¨ Find the Optimum Site Configuration
Find by trial and error
¨ Choose the Optimum Design
choose based on aesthetics, ease of construction, ease of maintenance, local availability of materials, and environmental impact ¨ Record Your Design
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