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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/
Module Title: Bridge Engineering
Module Code: CIVL
School: Building and Civil Engineering
Programme Title: MEng in Structural Engineering
Programme Code: CSTRU_9_Y
External Examiner(s): Dr M.J. Creed, Mr P. Sutton Internal Examiner(s): Mr K. Ruane
Instructions: Answer Question 1.
Duration: 3 hours
Sitting: Winter 2011
Requirements for this examination: This is an open book examination
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q
A bridge is required to carry a new road across a plain containing an existing canal embankment. The new road shall cross the canal at a skew angle of 15 degrees. The carriageway on the bridge shall be 6.0m wide as shown in Figure 1. The bridge shall have parapets 1.0m high incorporated at the edges of the deck.
The bridge may be designed as a multi-span structure or a single-span structure. The Client requires that the span length provided in any multi-span structure to be a minimum of 30m.
The road levels and minimum clearances shown in Figure 1 must be achieved. No foundation works are permitted within 5m of the toe of the canal embankment.
Roadway loading shall be 10kN/m^2. Footpath loading shall be 5kN/m^2. A load of 500kN (applied in the plane of the bridge deck, in any direction) shall be used to represent vehicle forces such as braking, traction and skidding. Wind loading shall be 2.0kN/m^2. Temperature and impact loading may be ignored.
Granite bedrock is located at ground level on the plain and on the high ground bordering the plain. The bedrock may be considered to have a safe bearing resistance of 1,500kN/m^2 at 500mm below existing ground level.
- Prepare an illustrated design appraisal indicating a distinct and viable solution for the bridge. Identify the type and details of construction together with the overall means of stability and articulation. State the reasons you have chosen your solution. (60%)
- Prepare sufficient design calculations for the bridge superstructure to establish preliminary sizes of all significant structural elements. (40%).
