Civil Works Design Two-Lane Highway - Engineering Assignment Help

Assignment Task

Task 1 – Civil Works Design

You are required to undertake a civil construction design project as outlined below. Your Assessor will take the role of the client for the purposes of this assessment task.

Design Specifications

1. The Problem

You are a civil designer working for the state department of transportation. You have been assigned responsibility for the design of a truss bridge to carry a two-lane highway across the river valley shown below.

2. Design Objective

Satisfy all of the specifications listed below, while keeping the total cost of the project as low as possible.

Required:

Part 1: (Design Analysis)

Refer to design model 1 document. Given the below forces:

Determine the horizontal and vertical components of reaction at the support.

Determine the forces in members 17, 19, 20, 16 and 21. State if the members are in tension or compression. Note that all angles are 45 degrees.

Part 2: (Estimation)

1. Make a detailed list of all constraints and requirements to the bridge design.

2. Three different materials available for the design of the bridge:

• Carbon steel,

• High-Strength Low-Alloy steel and

• Quenched and Tempered Low-Alloy Steel

Describe the differences between these materials. Which material is the best choice for a given structural design?

3. One of the most important decisions in the bridge design is the selection of a cross section type, solid bar or hollow tube, for each member in the structural model. At what locations should each type of cross section be used? (Hint: you should consider the effect of the different cross-sections on member strength in both tension and compression.)

4. A good engineer will try to find the best balance between the site cost (such site excavation, adding piers or cables) and the truss cost. Explain what is meant by this statement and provide some examples. 5. You are given two proposed designs that meet the design specifications. Estimate the total cost for each design and accordingly provide a recommendation on which model is more economical.

6. For each design model, address its environmental impact on the surroundings such as the river channel.

7. Based on all your analysis (cost + environmental), which is the optimum design?

8. Perform a risk assessment for the project taking into account all lifespan stages:

•  the existing conditions
•  the application of the design
•  maintainability of the works

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