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Structural Design - III (October 2009)

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Total No. of Questions : 8] P931 [Total No. of Pages : 4 [3664]-104 B.E. (Civil) STRUCTURAL DESIGN - III (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q1 or Q2, Q3 or Q4 in section - I. 2) Answer Q5 or Q6, Q7 or Q8 in section - II. 3) Answers to the two sections should be written in separate books. 4) Figures to the right indicate full marks. 5) Use of IS 1343, IS 456, IS 3370 & non programmable calculator is allowed. 6) Neat diagrams must be drawn wherever necessary. 7) Assume any other data if necessary & mention it at the starting of the answer. 8) Mere reproduction from IS Code as answer, will not be given full credit. 9) Assume any other data, if required. SECTION - I Q1) a) A mild steel plate of cross section 10 mm x 50 mm, of length 1.5 m is supporting a load of 120 N through a spring having stiffness k = 100N/ mm as shown in fig(1). Calculate the natural frequency of the system if modulus of elasticity of mild steel is 200Gpa. [8] b) A post tensioned prestressed concrete beam section has top flange 480 x 150, web 120 x 380 and bottom flange 350 x 330 mm, is simply supported over a effective span of 18 m and carries a super imposed load of 14 kN/m over entire span. Calculate extreme fiber stresses in concrete at midspan at initial and final stage. The 3 No. of 12/7 Freyssinet cables having zero eccentricity at supports and c.g. area of steel at 80 mm from soffit of the section and are stressed to initial prestress of 930 Mpa. Take loss ratio as 0.82 and unit weight concrete as 25 kN/m .[17] P.T.O.

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Additional Info : 2003 Course
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