Cork Institute of Technology
Bachelor of Engineering (Honours) in Structural Engineering – Stage 3
(NFQ – Level 8)
Autumn 2005
Structural Design & Detailing II
(Time: 4 Hours)
Instructions:
1. Attempt all FOUR questions
2. All questions carry equal marks
3. Use separate answer books for each section
4. Candidates may refer to: Extracts from
British Standards for students of Structural
Design & Approved Design Aids.
Examiners:
Mr. M. Ryan
Mr. D. J. Walsh
Prof.P.O’Donoghue
Mr.T.Corcoran
Section A
Q1. The intermediate braced frame of Fig.Q1 is part of an in-situ reinforced concrete framed
building. The frames are at 5m centres and transmit the loading from the reinforced
concrete roof and floors to foundations.
Lateral stability of the building will be provided independently of the main beam and
column framing shown.
Design the
lower storey of the braced edge column on grid line A (i.e. design from
foundation to underside of 1st floor) - the column is to be of square cross section, 275mm x
275mm.
As shown on Fig.Q1, at first floor level the end of this column is connected to beams on
either side which are at least as deep as the overall dimension of the column. At foundation
level the pin connection provides only nominal restraint to rotation.
Design Information:
Loading: (Characteristic Values)
Characteristic Dead and Live Loads are as shown on Fig.Q1 – the dead loading includes
the self weight of the slab, screed, ceiling, services and finishes but does not include the
self weight of beam webs – take the specific weight of reinforced concrete as 24 kN/m3
Materials: Concrete: Grade 35 (maximum aggregate size 20mm)
Reinforcement: Main – high yield steel, fy = 460 N/mm2
Links – mild steel, fy = 250 N/mm2
