Civil Engineering homework help

By

School of Engineering, Computing and Maths
 
Reynolds Building, Plymouth

 
 
 
            A vehicular access bridge is required over the top of a busy inner city motorway to create access from an existing development to a large area of new development as shown on Figure 1. The bridge is to be able to support Load Type 1 (in accordance with “The Simplified Rules for Student Projects” Publication). The cross-section is shown on Figure 1.
As part of the existing development a length of the access road was constructed up to the back of the existing retaining wall, ready for the bridge to be provided at a later date, so the level is fixed here. There are however existing factory units adjacent to this road, as shown on Figure 1, which means that there cannot be any disruption to that side of the scheme without the client being held responsible for business loss, which is likely to be passed on to your practice.
 
Working individually you are required to:
 
(a)        Provide a description of 2 possible bridge forms which could be used to provide the bridge, giving, in bullet point, the buildability advantages and disadvantages of each. This must include an outline construction sequence primarily in sketch format. You must provide outline sizes for the main elements of one structure only.
 
(40 Marks)
 
(b)        State which of the options is your preference for the bridge construction, giving reasons and then provide sufficient calculations for the design of the main members eg beams, cables, main arch, towers etc. (not the slab or steel deck). Provide neat hand sketches of your preference for plan, section and elevation.
(60 Marks)
 
Data:

Assume there is no restriction on access, working area and storage on the proposed development side of the motorway
Footway load is 5kN/m2.
Assume all areas are level.
You can ignore the footway construction and any surfacing on the carriageway as per the class worked example.
SGBP in all areas 200kN/m2in the shales which occur at a depth of 3m below existing ground level.
Site wind load is 1kN/m2.
There must be a 11m clearance, above carriageway level, over the top of the central reservation to allow for a future light rail scheme on the central reservation. This means that you cannot have permanent piers on the central reservation.
The motorway can only be closed overnight on a Saturday from 8pm until 8am, and each closure will cost the client £50k in traffic management.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

A

Motorway

16m

Embankment

8m

Bridge Deck Section

Section A-A

10m carriageway

2m footway

1.2m high parapets

Motorway

Central Reservation

A

10m

16m

10m

Existing Development

Existing Retaining Wall – 500mm thick rc construction indicated by old record drawings

10m

Existing Factory Units

Existing Factory Units

10mm

3m

2m

3m

2m

Grass Verge

Carriagewaym

Footway

Existing Highway to Proposed Bridge

Existing Development

Proposed Development

Central Reservation

Fixed Factory Entrance

Fixed Factory Entrance

Proposed Development

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 1
 
 
STAD 324 Test Marking Sheet – 2019/20
 
Student Names:
 

Element
Mark
Total

2 bridge forms suited to the the brief. This includes marks for advantages / disadvantages and outline size for one only.
 
/30

 
 
 

General structural comments ie construction sequence sketches, stability, robustness,  risk assessment
 
/10

 
 
 

 Main element calcs
 
/30

 
 
 

Sketches in calcs
 
/10

 
 
 

Hand sketches
 
/20

 
 
 

 
total
/100

 
 
 

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