Show all your work for full credit!! Reference ODOT

Transcription

1 CIVE=3520 Transportation Engineering 2 Midterrn No. 1 Name: OJÿ_en Book & Notes Show all your work for full credit!! Reference ODOT Fÿures that you use!! Also make sure that you answer theÿtion that is asked!! Don't over complicate the problems!!!!! They are all straight forward applications of what we learned in class. NO CELLPHONES ALLOWED DURING EXAM!!!! Total test time allowed = 1 hour 50 minutes. NO Exceptions! Deductions will be taken from your score for hints that you pry from the instructor including warm fuzzy assurance. Note that clarifications are not the same as hints. Everyone must do problems 1 & 2. You can then work any combination of problems 3 thru 6 (including only parts of #6) so that the total of that group equals 40 points and the overall total equals 100 points. Do them all and I'll take the best scores of the ones that you have done to maximize your score up to 100 points. Problem No. Points Score Required Required Do 40 points worth of problems out of this grouping of # a) 5 b) S c) 5 d) 5 Bonus -Hints (2 points each) Total PAGE 1

2 , REQUIRED PROBLEM Your survey crew is doing a route survey along the centerline of an existing road slated for reconstruction. The crew found monuments for the road at the PC, PT and PI points. They have given you the following information: PT Station = , PC to PI Distance = 500', PC to PT distance = 955' Calculate the PC & Forward PI Stations (30 points) 500' PI < -- ij... F V/'<" W t 2;1> ÿ"... " PAGE 2

3 . REQUIRED PROBLEM A proposed vertical alignment was originally designed for a 40mph design speed creating a 200' long crest vertical curve. The alignment has an entrance grade GI= 2.16%, and an exit grade G2= -1.84% as it proceeds over an 8" natural gas line which is located at Station An increase in the design speed to 50mph is proposed for the road. Will the new ground clearance (road surface to top of pipe) for the revised longer crest vertical curve meet the minimum 4' required? (Remember to round up to the next even +00 or +50 for curve length.) (30 points) PV] STA ELEV = 244,16 dÿ ''jÿ P,, o 01VE-3520 ÿ;:;::iij PAGE 3

4 , A road is being design with a large retaining wall on the inside edge. For the curve shown below, do the curve and offsets provide adequate stopping sight distance for a 40 MPH design speed? (10 points) - ÿ P'/ C? / 3ÿS ' --I,d'_ I.TJ J PAGE 4

5 , Calculate the total superelevation transition length (L) from the normal section to the fully superelevated section for the following conditions for a simple circular horizontal curve. (10 points) en = Do= 1 30' v= 70 MPH 4 lanes 12' each (2 each way) Urban Location 5. Determine the Length of Need (X) of a guardrail system for the following warranting feature and roadway characteristics: (10 points) Barrier Setback = 8' ADT = 1700 Clear Zone = 30' Back of Warranting Feature = 27' Design Speed = 70 MPH No Taper (b/a = 0).,dÿÿ',ÿ ÿ 9 PAGE 5

6 6. Five (5) points each. Explain answers for credit. a. Determine the required shoulder widths (graded & treated) for a rural arterial road with 3000 ADT and 8:1 roadside foreslopes. b. Is a 24' width (two 12' lanes) roadway that is widened through a 6 curve to 27' total satisfactory for a 65 mph design ÿeed? Explain. C, Is a trapezoidal ditch with a 8' bottom, a 5:1 foreslope and a 2.5:1 backslope traversable? Explain. d. Is a large pole in the clear zone of a highway that sits 24' from the edge of pavement on a 7:1 foreslope? The highway has an ADT=600 and a 65 mph design speed. Explain. Oid Bonus Point Questions (1 pt Each) What is the height of a dead cow lying in the road? ÿsÿ... What did the ODOT road supervisor make us put in front of the big orange drilling rig in the clear zone so no one would hit it? CLVE-3520 PAGE 6

7 CLVE-3520 Transportation Engineering 2 Midterm No. 1 Name: Open Book & Notes Show all your work for full credit!! Reference ODOT Fiqures that you use!! Also make sure that you answer uestion that is asked!! Don't over complicate the problemst!ff! They are all straight forward applications of what we learned in class. NO CELLPHONES ALLOWED DURING EXAM!!!! Total test time allowed = 1 hour 50 minutes. NO Exceptions! Deductions will be taken from your score for hints that you pry from the instructor including warm fuzzy assurance. Note that clarifications are not the same as hints. Everyone must do problems 1 & 2. You can then work any combination of problems 3 thru 6 (including only parts of #6) so that the total of that group equals 40 points and the overall total equals 100 points. Do them all and I'll take the best scores of the ones that you have done to maximize your score up to 100 points. Problem No. Points Score i l 3 i0 4 t0 Required Required Do 40 points worth of problems out of this grouping of # a) 5 b) 5 c) 5 d) 5 Bonus -Hints (2 points each) Total PAGE 1

8 , REQUIRED PROBLEM Your survey crew is doing a route survey along the centerline of an existing road slated for reconstruction. The crew found monuments for the road at the PC, PT and PI points. They have given you the following information: PT Station = , PC to PI Distance = 400', PC to PT distance = 760' Calculate the PC & Forward PI Stations (30 points) " 400' PI A, o... PAGE 2

9 , REQUIRED PROBLEM A proposed vertical alignment was originally designed for a 40mph design speed creating a 200' long crest vertical curve. The alignment has an entrance grade GI= 1.84%, and an exit grade G2= -2.16% as it proceeds over an 8" natural gas line which is located at Station An increase in the design speed to 50mph is proposed for the road. Will the new ground clearance (road surface to top of pipe) for the revised longer crest vertical curve meet the minimum 4' required? (Remember to round up to the next even +00 or +50 for curve length.) (30 points) P PAGE 3

10 3. A road is being design with a large retaining wall on the inside edge. For the curve shown below, do the curve and offsets provide adequate stopping sight distance for a 40 MPH design speed? (10 points) PROPOSED RETAINING WALL +... P ' ÿ+<'-' ÿ C. i >;ÿx.9... ; 6 S6 d d... /9,, o... I < ÿ;:f' <... Uÿ.A+.ÿ.,+.,-z"-'---,.- ÿ -ÿ ;-ÿ , CLVE-3520 PAGE 4

11 , Determine the total superelevation transition length (L) from the normal section to the fully superelevated section for the following conditions for a simple circular horizontal curve. (10 points) en = Do= 1 30' 4 lanes 12' each (2 each way) v= 65 MPH Urban Location 5. Determine the Length of Need (X) of a guardrail system for the following warranting feature and roadway characteristics: (10 points) Barrier Setback = 10' Back of Warranting Feature = 22' ADT = 5500 Design Speed = 70 MPH No Taper (b/a = 0) Clear Zone = 30' A ÿ ;' $4s CLVE-3520 PAGE 5

12 6. Five (5) points each. Explain answers for credit. a. Determine the required shoulder widths (graded & treated) for a rural collector road with 800 ADT and 8:1 roadside foreslopes. 7 +.ÿ. b, Is a 24' width (two 12' lanes) roadway that is widened through a 6 curve to 27'Fÿ+totaIHÿ,c:satisfactoryÿ forÿ a,ÿ;o35ÿ ÿmph designÿ (ÿ ÿ Of '*tÿ c. Is a trapezoidal ditch with a 3' bottom, a 5:1 foreslope and a 10:1 backslope traversable? Explain. I d. Is"dlarge pole in the clear zone of a highway that sits 10' from the edge of pavement on a 5:1 foreslope? The highway has an ADT=1000 and a 40 mph design speed. Explain. Bonus Point Questions (1 pt Each) What is the height of a dead cow lying in the road? ÿ What did the ODOT road supervisor make us put in front of the big orange drilling rig in the clear zone so no one would hit it? CLVE-3520 PAGE 6