SPSC 2014 Assistant Engineer (Civil) BPS-17, Public Health Engineering Department (2014) — Theory of Structures and Steel Structures Paper

Assistant Engineer (Civil) BPS-17, Public Health Engineering Department (2014) — Theory of Structures and Steel Structures. Competitive examination for the post of Assistant Engineer (Civil) BPS-17 in PHED, Government of Sindh · Tuesday 28 January 2014, 10:00 am to 1:00 pm · Max marks 100. Attempt any five questions.

1. 1Explain any four of the following: (20) (i) Importance of Steel Structures in global construction industry. (ii) Point of Contraflexure. (iii) Determinacy and Indeterminacy of Structures. (iv) Truss and its types. (v) Moving loads and influence lines.

2. 2Design a column to carry an axial load of 350 tons. The effective length of the column is 15 ft. Select four angle sections. Consider the value of Fc = 21 tons/in². (20)

3. 3Differentiate between ASD and LRFD methods. Being a structural engineer, which method will you prefer for the design of steel structures? Justify your preference. (20)

4. 4Define riveted joints and enlist the assumptions made in the theory of riveted joints. Also describe the failures of riveted joints. (20)

5. 5What is a steel bridge and under which conditions is it constructed? Highlight its benefits over an RCC bridge, if any. (20)

6. 6A simply supported beam of span 'L' carries a uniformly distributed load of intensity 'w'. Compute the maximum deflection and also prove Δmax = 5wL⁴/384EI. (20)

7. 7Calculate the lateral earthquake force acting on each floor of a 10-storey building with basement for the following data: (20) Plan area 60' × 120'; total roof weight = 90 kips; weight of each floor = 370 kips; occupancy importance factor (I) = 1.25; earthquake zone coefficient (Z) = 0.75; lateral force coefficient (K) = 1.00; numerical coefficient for site resonance = 1.5; building width in the direction of interest (D) = 60'; height of building (H) = 120'; height of each floor (h) = 12'.