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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2008/
Module Title: Structural Design
Module Code: CIVL
School: Building and Civil
Programme Title: Bachelor of Engineering in Civil Engineering - Award
Programme Code: CCIVL_7_Y
External Examiner(s): Mr J Lapthorne, Mr J Kindregan Internal Examiner(s): Dr N Power, Ms S Corcoran
Instructions: Attempt all questions Use separate answer books for each section.
Duration: 2 Hours
Sitting: Summer 2009
Requirements for this examination: Candidates may refer to
1. BSI-PP7312 –‘Extract from British Standards for students of Structural Design’ 2. ‘Approved Design Aids’ – (CIT Booklet) 3. ‘Designed & Detailed’ – (BCA Booklet)
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.
Section A – Reinforced Concrete & Masonry
(Attempt both QA1 and QA2)
QA1 Masonry (Total 20 Marks)
The 3.2m high piered wall as shown in Fig QA1, is constructed from 440mm x 215mm x 100mm solid concrete block (5N/mm^2 ) laid in a grade (iii) mortar. Piers are incorporated into the wall at 4.7m centres as shown. Manufacturing/construction control categories are special/normal. Calculate the ultimate axial load bearing of the wall when the resistance to lateral movement is (a) ‘simple’ and (b) ‘enhanced’. Note: It is note necessary to check the capacity of the piers.
QA2 Pad Footing (Total 30 Marks)
The attached drawing, Fig QA2, details the structural framing arrangement of a two storey building of in-situ reinforced concrete construction. Single pad footing foundations are provided to each individual column.
The ground floor will comprise ground bearing concrete slab construction and no loading from this level will be carried by the structural framing.
Lateral stability of the building will be provided independently of the main beam and colm framing shown.
(i) Design the pad footing to column C3, in accordance with BS (Assume a pinned connection between column and its footing).
Design Information:
Durability and Fire: Exposure: Substructure – moderate, superstructure – mild Fire: 1 hour
Loading: (Characteristic Values): N (^) service = 650kN N (^) Ultimate = 940kN
440mm 440mm
215mm
FIG. QA
Question B1 Structural Steel (30 marks)
A lattice beam is indicated in Figure QB1. It is to be used in the roof of a warehouse. The roof deck
is fixed directly to the top boom. The compression boom (top boom) is laterally restrained by the roof deck. The lattice beams will be positioned at 4m c/c’s. Wind loading may be ignored.
Figure QB1 Lattice Beam
Loading: kN/m 2 kN/m
Roof decking 0.
Ceilings & Services 0.
Self Weight assumption 1
Live 0.
Design:
- The internal tension member
- The compression boom
Available structural steel sections:
171 x 178 x 23T; 146 x 127 x 22T; 102 x 127 x 11T; 70 x 70 x 8EA;
50 x 50 x 8EA
Question B2 Timber (20 marks)
What is the load bearing capacity of the stud wall illustrated in Fig.QB2?
Express your answer in terms of a uniformly distributed load, in units of kN/m.
DESIGN INFORMATION
Durability: Dry Exposure
Loading duration: Long Term
Material Data: British Pine GS, wtimber = 5kN/m^3
