CE 195
Civil Engineering Design
Proposed Road
in
Diran Yanikian
March 14, 2006
Table of Contents
►
Scope
§ This introductory course in civil engineering design seeks to promote the following skills:
► Student Creativity
► Use of “open ended” problems
► Use of modern design theory and methodology
- Institution:
Cal State Univ.,
- Instructor: Dr. Purasinghe, Ph.D., P.E.
► Abstract
§ In this introductory design course students are assigned the task of designing an access road. This access road is to extend from a known highway to a proposed recreational facility.
- Students are expected to show an understanding of the engineering design process.
- Students are expected to adhere to engineering design standards as set forth by governmental and associated institutions. The application on these standards is paramount to the design process. However, the student must also take into consideration the ethical aspects of these standards relative to human and environmental safety.
► Design of an Access Road
§
It has become necessary to design an access
road, that begins at some point on
- This road is to end at a newly proposed recreational facility at an elevation of 893.75 feet.
► Engineering Standards
§ Permissible grade
► Grade < 12% to promote overall efficiency and safety.
- Side slopes
► Side slopes must maintain a 2:1 ratio to promote stability.
- Water Dispersion
► The pavement must be “crowned” to promote water dispersion. Flooded roads are a clear danger to the safety of drivers. The massive reduction in tire friction would cause frequent accidents.
- Radius of Alignment
► The minimum radius of turns must not be less than 200 feet. Anything below a 200 ft. radius would call for major banking of the road. Taking into consideration that this isn’t a racetrack, we must adhere to this standard.
► Economic
§ The role of civil engineering is to produce designs which maintain “guideline functionality” while reducing overall costs. Economic feasibility becomes an obvious concern considering the large scale of modern civil design projects.
► Political
§ A civil engineer must show proof of design feasibility to the involved governing bodies in the form of:
► Introductory and final design characteristics
► Detailed engineering analysis and proof of standard adherence
► Cost analysis and feasibility
► Traffic impact report
► Social (Ethics Aspects)
§ From the perspective of engineering projects conceived as social experiments, the general features of a morally responsible engineer are:
► A primary obligation to protect the safety of human subjects and respect their right of consent
► A constant awareness of the experimental nature of any project, imaginative forecasting of its possible side effects, and a reasonable effort to monitor them
► Autonomous, personal involvement in all steps of a project
► Accepting accountability for the results of a project
► Environmental
§ It is not uncommon for an engineer to be faced with issues of the environmental kind. If the design calls for major cutting of natural vegetation, as ours does, an Environment Impact Report (EIR) is undoubtedly necessary.
At first I came up with Alt 1. Then I noticed that the curves were less then 200 ft. radius.
So after some thought I came up with Alt 2 which is more convenient to use since it follows the contour lines.
Stations are chosen at every 340 ft.
|
|
|
|||
|
Horizontal Distance (ft) |
Existing Ground Elevation (ft) |
Grade Slope (%) |
Proposed Road Elevation (ft) |
Proposed Grade Slope (%) |
|
0 |
489.0 |
|
489.0 |
|
|
150 |
494.5 |
3.7 |
494.5 |
3.7 |
|
300 |
498.0 |
2.3 |
498.0 |
2.3 |
|
450 |
512.5 |
9.7 |
512.5 |
9.7 |
|
600 |
535.0 |
15.0 |
530.0 |
11.7 |
|
750 |
545.0 |
6.7 |
545.0 |
10.0 |
|
900 |
562.5 |
11.7 |
562.5 |
11.7 |
|
1050 |
575.0 |
8.3 |
575.0 |
8.3 |
|
1200 |
600.0 |
16.7 |
592.0 |
11.3 |
|
1350 |
625.0 |
16.7 |
609.8 |
11.9 |
|
1500 |
637.5 |
8.3 |
627.5 |
11.8 |
|
1650 |
650.0 |
8.3 |
645.0 |
11.7 |
|
1800 |
662.5 |
8.3 |
662.5 |
11.7 |
|
1950 |
675.0 |
8.3 |
675.0 |
8.3 |
|
2100 |
700.0 |
16.7 |
690.0 |
10.0 |
|
2250 |
708.3 |
5.5 |
705.0 |
10.0 |
|
2400 |
725.0 |
11.1 |
722.5 |
11.7 |
|
2550 |
741.7 |
11.1 |
740.0 |
11.7 |
|
2700 |
741.7 |
0.0 |
741.7 |
1.1 |
|
2850 |
750.0 |
5.5 |
750.0 |
5.5 |
|
3000 |
766.7 |
11.1 |
766.7 |
11.1 |
|
3150 |
783.3 |
11.1 |
783.3 |
11.1 |
|
3300 |
791.6 |
5.5 |
791.6 |
5.5 |
|
3450 |
808.3 |
11.1 |
808.3 |
11.1 |
|
3600 |
816.6 |
5.5 |
816.6 |
5.5 |
|
3750 |
825.0 |
5.6 |
825.0 |
5.6 |
|
3900 |
833.3 |
5.5 |
833.3 |
5.5 |
|
4050 |
837.5 |
2.8 |
837.5 |
2.8 |
|
4200 |
837.5 |
0.0 |
837.5 |
0.0 |
|
4350 |
856.3 |
12.5 |
855.0 |
11.7 |
|
4500 |
858.3 |
1.4 |
858.3 |
2.2 |
|
4650 |
866.6 |
5.5 |
866.6 |
5.5 |
|
4800 |
881.3 |
9.8 |
881.3 |
9.8 |
|
4950 |
887.5 |
4.2 |
887.5 |
4.2 |
|
5100 |
893.8 |
|||