CAD-2012-WPBD-Blankenbaker

= **CAD - Design a Truss Bridge Unit** =

//2nd Semester 2012//
__ **Part I** __

Answer the following questions:

1. What are the 7 steps in the problem-solving process? 1. identify the problem 2. define the problem 3. develop alternative solutions 4. analyzeand compare alternative solutions 5. select the best alternative 6. implement the solution 7. evaluate the results 2. What is engineering design? What is involved besides math, science and technology? is a specialized form of problem solving. a creative process 3. What are the three major stages of the engineering design process. the project planning stage, the design stage, the construction and operation stage 4. Name the three components of each stage in the engineering design process. project planning stage: Needs analysis, development of alternatives, preferred alternative. Design stage: subsystem selection, analysis, and design. Construction and operation stage: procurement, construction, and maintenance.

5. What type of engineers were included on Anne's Design team? Give a brief description of each engineer's job. structural, transportation, geotechnical, hydraulic, and environmental engineers 6. What did the Design team do during Phase 2 of the project? they developed different bridge types and test each one to see witch one was the best 7. Name the most economical bridge for each span: a. under 1000 ft beam and truss bridges b. 1500-3000 ft cable stayed bridges c. over 2000 ft suspension bridges d. 1000-2000 ft arch and cantilever truss bridges 8. How much detail is developed during the conceptual phase? conceptual is the only one with all of the right information to complete the struture and that will meet the owners needs 9. What is the purpose of a type study? the type study describes the bridge configurations that were considered by the designers. 10. What is an iteration? What happens with each new iteration? iteration is a repetition of the analysis design cycle, with a new iteration the cycle and design changes 11. What is the purpose of a foundation? How does the geotechnical engineer choose the type of footing used? the purpose is to distribute the weight of a structure with all of the loads acting on the soil where the structure rests. the footing depends on the quality of the soil. if there is firm rock or firm soil close ot the surface, then a geotechnical engineer will choose a spread footing witch is a slab of concrete on the rock or soil. if the soil is soft then they will need pliers. 12. Name the components of a complete draft of the design. Drawing, reports, and drafting specifications are all needed to complete a draft of the design. 13. Describe the steps in the design-bid-build project delivery process. public notices and ads in the industry publications. Construction contractors to keep copies of the plans, specifications, and other bidding documents for the owner and they also need to prepare and submit the bids. On designated day the owner opens a bid and the bids are check for all of the required information. then the owner picks the lowest bid and the contractor becomes the constructor. 14. How often are bridges inspected and what do the technicians look for during these inspections? bridges need to be inspected about every two to three years, they look for cleaning the storm drains, repainting the weathered steel, and to repair the cracks. 15. How do CAD programs enhance the design of bridges? Easier to create 2D or a 3D drawing of the bridge. because it is more visual, highly structural, internal forces. select the steel and to make sure it is strong. It also makes it easier to share to a engineers. 16. Have CAD programs made engineers obsolete? Why or why not? Engineers have not became obsolete because of CAD programs because CAD is just a tool to improve people but like any tool it can be missed used. 17. What is the most important feature of the West Point Bridge Designer (WPBD)? The most important feature of WPBD is the load test. You can create a complete, stable, structural model, and then do a load test by clicking a single button. 18. Describe what happens within the program when the load test is initiated. The load test supports all of the locations in your structural model. It calculates the weight of the deck, road surface, floor beams, standard truck load, the movement of the truck going across the bridge. It also gives you the absolute maximum tension force, and compression force. 19. When you use the WPBD to design a truss, what phase of the nine-phase engineering process are you doing? Development of conceptual alternative. 20. How do the load test results help you with the bridge design? It save you alot of time from building a model and testing the weight it is also more accurate giving you more information to strengthen your bridge.