Download Autumn Examinations 2008-09: Structural Engineering 1 (CIVL 6024) Exam Paper and more Exams Structural Analysis in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2008/
Module Title: Structural Engineering 1
Module Code: CIVL 6024
School: School of Building and Civil
Programme Title: Bachelor of Engineering in Civil Engineering – Stage 2
Programme Code: CCIVL-7-Y
External Examiner(s): Mr. J. Kindregan, Mr. J. Lapthorne Internal Examiner(s): Dr.R.A.Guinee, Mr AM Conway
Instructions: Answer 4 questions. Each question carries equal marks
Duration: 2 Hours
Sitting: Autumn 2009
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 paper. If in doubt please contact an Invigilator.
Q1 (a) Determine the forces in each member of the pin-jointed framework shown in Fig.Q1. Indicate whether these forces are tensile or compressive. (15%)
(b) Determine the vertical deflection at node D of the truss in Fig.Q1 if E = 205 kN/mm^2 for steel and all members have cross sectional area A = 400 mm^2. (10%)
Q2 (a) Determine the support reactions for the beam shown in Fig.Q2 (a) and hence draw the shear force and bending moment diagrams for the beam noting all significant values. Points of contraflexure can be ignored in the calculation process. (15%) (b) If the beam cross section is as shown in Fig.Q2 (b) determine the maximum tensile and compressive bending stresses in the beam. (10%)
Q3. (a) Evaluate the centroid and second moment of area of the irregular beam shown
in FigQ3(a). Find also the elastic section moduli. (8%) (b) Determine the position of the plastic neutral axis and the plastic section
modulus of the beam shown in FigQ3(b). (8%) (c) Fatigue considerations limit the maximum permissible stresses to 120N/mm2(compression) and 165N/mm2 (tensile) for the beam in section
(a).Determine the maximum sagging and hogging bending moment to which the beam can be subjected. (9%)
Q4. (a) A rectangular singly reinforced concrete beam is 160mm wide and has an
overall depth of 320mm. It is reinforced in the bottom face by two 25mm diameter steel bars located at a depth of 290mm. Calculate the maximum
stress in both the concrete and steel if the beam is subjected to a moment of 50kNm. Take the ratio of the elastic moduli of the materials (Es/Ec) as 15.
(15%) (b) Calculate the total force in the concrete and steel in the beam in part (a).
(5%) (c) A steel beam ,4 metres long and forming part of a building structure, is
firmly built into solid walls at either end. If the temperature rise in the beam on a summer day is 15C, what stress is induced in the beam? Take
coefficient of linear expansion to be 0.000012/C and E=200kN/mm^2 (5%)
