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Advanced Structural Design (Elective II) (October 2010)

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Total No. of Questions : 8] P1351 [Total No. of Pages : 2 [3864]-115 B.E. (Civil) ADVANCED STRUCTURAL DESIGN (Elective - II) (401007) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Attempt Q.1 or Q.2, Q.3 or Q.4 from Section-I and Q.5 or Q.6, Q.7 or Q.8 from Section-II. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. 6) Use of cell phone is prohibited in the examination hall. 7) Use of electronic pocket calculator, steel table and relevant IS code is allowed. SECTION - I Q1) Design an open web (castellated beam) for a span of 15 m. The dead load coming on roofing is 750 N/m2 and live load on the roof is 2000 N/m2. Cut the section at 45 and adjust the section such that overall depth of section should not exceed 900 mm. Assume fy = 250 MPa. [25] OR Q2) Select suitable configuration of the truss and determine the maximum compressive and tensile force in the leg at the base for a 50 m microwave antenna tower is to be built near Mumbai. The terrain at the location is a level ground. It has to carry a 3 m diameter hemispherical antenna disc at the top. [25] a) the width at the top of tower = 3.2 m b) weight of platform at top = 1 kN/m2 c) weight of railing at top = 0.25 kN/m. d) weight of ladder and cage = 0.6 kN/m e) weight of antenna disc and fixture = 10 kN f) self weight of truss = 6 kN/m g) Terrain category II and class of building B P.T.O. Q3) Two channel sections without bent lips 200 mm 50 mm and 2.5 mm thick are connected with webs to act as beam. The effective span of a simply supported beam is 8 m. The beam is laterally supported throughout its length. Determine the maximum uniformly distributed load inclusive of self weight which can be supported by the beam. Assume fy = 232 N/mm2 and Ix = 2 390.307 104 mm4. [25] OR Q4) The bottom chord tension member of a roof truss is subjected to an axial pull of 450 kN. A differential chain hoist arrangement is attached to the bottom chord and gives a point load of 50 kN at the centre. The length of the member between panel points is 5 m. Design the section consisting of two unequal angles with long legs kept back and turn upward. Also design [25] the connection. Assume fy = 250 N/mm2. SECTION - II Q5) Design an exterior panel of size 5 m 5 m of a flat slab with suitable drop to support a live load of 4000 N/m2. The slab is provided with floor finish of 1000 N/m 2 . The floor system is supported by columns of size 500 mm 500 mm. Floor to floor distance is 4 m. Use M20 grade of concrete and Fe415 grade of steel. [25] OR Q6) Design an intz type water tank of capacity 8,00,000 liters. The height of staging is 10 m up to bottom of tank. The bearing capacity of soil to be taken as 200 kN/m2. Wind pressure intensity is 1.8 kN/m2. Use M20 grade of concrete and Fe415 grade of steel. [25] Q7) Design a counterfort retaining wall for the following data. [25] Height of wall above ground level = 6 m Safe bearing capacity of soil = 160 kN/m2 Angle of repose = 30 Unit weight of soil = 16000 N/m3 Spacing of counterfort = 3 m Coefficient of friction between soil and concrete = 0.5 Use M20 grade of concrete and Fe415 grade of steel. OR Q8) Design simply supported circular slab of 6 m diameter, subjected to service live load of 3.5 kN/m2 and floor finish of 1 kN/m2. Use M20 grade of concrete and Fe415 grade of steel. [25] [3864]-115 rrr -2-

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Additional Info : 2003 Course
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