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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2011
Module Title: Structural Engineering 2
Module Code: CIVL 6025
School: Building & Civil Engineering
Programme Title: Bachelor of Engineering in Civil Engineering – Year 2
Programme Code: CCIVL_7_Y
External Examiner(s): Mr J. Murphy, Ms. M. Kyne Internal Examiner(s): Dr. R.A. Guinee, Mr. A. Conway
Instructions: Please answer FOUR questions. All questions carry equal marks
Duration: 2 Hours
Sitting: Semester 2 2011
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination. If in doubt please contact an Invigilator.
Q1 A beam has cross sectional details in mm shown in Fig.Q1.
(i) Determine the second moments of area Ixx and Iyy. (10 marks) (ii) If the beam is positioned to bend about the X-X axis and if the maximum permissible stress is 165N/mm^2 in compression and tension determine the moment of resistance of the section. (5 marks) (iii) What is safe uniform load that the beam will carry over a 6 m span? (10 marks)
220 200
45 0 m m (^) X X
30 mm
45 (^20 ) mm
90
Y
Y
Fig.Q
Q4 A composite beam consists of a timber section 120mm wide and 280mm deep with a 12mm thick steel plate securely fixed to the bottom face. Calculate the max stress in both timber and steel if the section is subjected to a sagging moment of 15kNm. Stresses to be found by (a) Transforming the section into an all timber section (13 marks) (b) Transforming the section into an all steel section. (12 marks) Etimber=12kN/mm2 Esteel=200kN/mm
Q5 A 250mm wide simply supported concrete beam with a span of 4m has six reinforcing bars of 25mm diameter each located at a depth of 400mm from the top of the beam.
(a) If the beam carries a uniformly distributed load of 20kN/m including self weight determine the maximum stress in both the concrete and the steel assuming that the modular ratio as 15. (13 marks)
(b) If the beam is subject to a load of 30kN at its centre determine the induced stresses in the steel and concrete. (12 marks)
