School of the Built and Natural Environment

Academic Year: 09/10 Examination Period: Summer

Module Leader: Bob Benton Module No: UBCLCV-20-2 Title of Module: STRUCTURAL DESIGN Examination Date: Tuesday 11th May 2010 Examination Start time: 09:30 Duration of Examination: 3 Hours Instructions to Candidates: Candidates must answer ALL six questions. The total possible mark for each section is 60 marks. Maximum marks obtainable are shown against each question. Each answer book must be identified with the candidate’s number. Materials supplied to the student will be:

Number of Examination Booklets (+ any continuation booklets as required) per Examination 2

Number of sheets of Graph Paper size G3 (Normal) 0 Additional Instruction to Invigilators:

Calculators May be used subject to University regulations Yes

Students allowed to keep Examination Question Paper No

Material supplied by student: Yes

Additional Specialised Material: PP7312:2002 Extracts from the British Standards for students of Structural Design.(An approved copy of this document must be supplied by the candidate). Structural Design data book. (This will be supplied by the faculty) Relevant extracts from British Standards not available in PP7312:2002 Treasury tags & adhesive triangles will be supplied as standard

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ECTION A

1. art of the steel frame for a new leisure centre is shown in Figure 1.

hoose a suitable section for the column Mark C.

he column is horizontally braced.

t foundation level, the joint between the column and the baseplate is fully stiffened

t level 1, beams Mark A and Mark B are connected to the column through simple end-

hoose one universal column section for the design and comment on the result.

ESIGN DATA

oadings

The total loads at level 1, including from the beams, are:

Characteristic dead load = 1800 kN

Include an allowance for the self weight of the column.

aterials

Steel UC sections – grade S275

(20 Marks)

S P C T Aagainst rotation. Aplate connections. C D L

Characteristic imposed load = 750 kN

M

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2. The beam Mark M, shown in Figure 2, forms part of the steel frame in a new industrial complex. It supports the legs of a piece of plant and a steel chequer-plate floor. The beam is fully laterally restrained by the chequer-plate floor.

Design the beam for

a. Bending b. Shear c. Check the chosen beam for deflection and comment on the result.

For the deflection check, use the unfactored imposed loads only. DESIGN DATA Loadings

Distributed loads due to the chequer-plate floor:

Characteristic dead load = 12 kN/m Characteristic imposed load = 6 kN/m

Include the self weight of the beam.

Concentrated loads due to the stanchions:

Characteristic dead load = 250 kN Characteristic imposed load = 90 kN

Materials

Steel UB sections – grade S275

(40 Marks)

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SECTION B

3. Details of a load bearing wall in a new residential development are shown in Figure 3. Determine a suitable strength for the bricks and mortar in the wall from foundation to level 1. DESIGN DATA Loadings

1. From the wall over:

Characteristic dead load = 30 kN/m Characteristic imposed load = 10 kN/m

2. From the precast floor (each side):

Characteristic dead load = 28 kN/m Characteristic imposed load = 14 kN/m

Include the self-weight of the wall from foundation to level 1. Pave brick work weighs 20 kN/m3

Materials

Brickwork

Category of manufacturing control: normal Category of construction control: normal

(30 Marks)

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4. The timber deck shown in Figure 4 will be installed in a restaurant in an old barn conversion.

Design the joists for

a. Bending b. Shear c. Check deflection

DESIGN DATA Loadings

Dead loads: - allow for the self weight of the structure - timber weighs 5.6 kN/m3

Imposed loads: BS6399:C3: = 5.0kN/m2 Materials

Timber: Grade C24 softwood

(30 Marks)

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SECTION C

5. The pad foundation shown in Figure 5 is part of a new office development.

Design the foundation for

a. Bending: determine the moment capacity of the concrete section and suitable reinforcement

b. Shear across the slab (slab shear) Punching shear checks are not required.

DESIGN DATA Loadings Column loads:

Characteristic dead load: 720 kN Characteristic imposed load: 375 kN

Materials

Concrete: Grade C32/40 fcu=40N/mm2

Reinforcement: Main bars: H500

(30 Marks)

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6. The reinforced concrete beam shown in Figure 6 is part of a sewerage treatment works.

Design the beam for

a. Bending Determine the moment of resistance of the concrete section and the reinforcement at the critical location.

b. Shear Determine the shear strength of the concrete section and design suitable links at the critical location and at mid-span.

Deflection checks are not required.

DESIGN DATA Loadings

Characteristic dead loads: 100 kN/m Characteristic imposed loads: 35 kN/m

Include the self weight of the beam.

Materials

Concrete: Grade C32/40 fcu=40N/mm2

Reinforcement: Main bars and links: H500

(30 Marks)

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END OF QUESTION PAPER