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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2012/
Module Title: Structural Design
Module Code: CIVL
School: Building and Civil
Programme Title: Bachelor of Engineering in Civil Engineering - Award
Programme Code: CCIVE_7_Y
External Examiner(s): Mr. Brian Byrne, Mr. Adrian Cunningham Internal Examiner(s): Mr. A. MacIlwraith, Mr. Des Walsh, Mr. T. McKenna
Instructions: Answer all questions Use seperate answer books for each section
Duration: 2 Hours
Sitting: Winter 2012
Requirements for this examination: Candidates may refer to
1. PP1990:2007 – ‘Structural Eurocodes’ Extract from Structural Eurocodes for students of structural design 2. ‘Approved Design Aids’ – (CIT 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)
Design is to conform to IS:EN 1996
The roof of a school assembly hall comprises a series of structural steel space frames supported on the inner leaf of a stiffened cavity wall as shown in Fig.QA1 – construction will be of 440mm x 215mm x 100mm solid concrete blocks.
The loading from the roof may be assumed to be uniformly distributed and concentrically applied along the inner leaf; assume that enhanced restraint is provided at the top of the wall. Lateral loading may be neglected.
(a) For a pier spacing of 3.8m calculate the characteristic compressive strength required of a Group 1 unit when using an M2 general purpose mortar. (The graphical approximation provided in Annex G of IS:EN 1996 may be used to obtain the Capacity Reduction Factor; it is not necessary to calculate the value using the fundamental equations) (12 marks) (b) Determine the Normalised Mean Strength and the Declared Mean Strength of the unit identified in (a) above. (6 marks) (c) The outer leaf is not directly carrying any vertical load from the roof structure however it does contribute to the vertical load capacity of the wall – how does it do so? (2 marks)
Design Data:
Characteristic permanent load, gk = 2.5 kN/m^2 (includes all roof self weight)
Characteristic variable load (roof), qk = 1.5 kN/m^2
WBlockwork (Characteristic) = 20.0 kN/m^3
Manufacturing control of unit: Category II
Execution control: Normal
QA2 Concrete (Pad Footing) (Total 30 Marks)
The attached drawing, Fig QA2, details the structural framing arrangement of a three 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 column framing shown. Pad Footing B Design the pad footing to column B3. (Try depth of foundation of 400mm) (Assume a pinned connection between column and its footing).
Design Information: Exposure: XC
Loading: Vservice = 890kN VEd = 1170kN
Materials: Concrete: C30/ Reinforcement: fyk = 500MPa
Soil Conditions: Safe bearing capacity of the soil at formation level = 180kN/m^2
A B C D^ E
Slab
Slab
450 x 275 T Beam
450 x 275 T Beam
475 x 275 T Beam
Stairs/ Lift
Stairs/ Lift
All columns are 325 x 325
PLAN
ELEVATION
Roof
2 nd
1 st
SCHOOL
SCHOOL
PIN PIN PIN PIN PIN fnd.
Figure QA
QB2 Timber (20 marks)
Refer to Figure QB2 below for construction details of a proposed stud wall. The timber used in the construction will be Grade C22. The duration of loading will be a combination of long term and medium term. Service Class 1 conditions will exist. The noggings provide restraint against buckling about the z-z axis.
Task: a) What is the load bearing capacity of the stud wall? Capacity to be expressed in kN/m. b) If the noggings were placed at 1800mm c/c, what effect would it have on the permissible load on the wall?
Section
Elevation
Figure QB2 Timber Trimmer Beam Details
NOTE:
Refer also to attached ADDITIONAL INFORMATION.
1200 mm
1200 mm
1200
mm
150 mm
44 mm
ADDITIONAL INFORMATION
QB1 Steel Design
