Anna University Chennai 2007 Bachelor of Architecture AR331- DESIGN OF STRUCTURES - 11 - Question Paper
Sunday, 03 March 2013 12:30Web
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12.b) A simply supported single reinforced rectangular beam of 300 mm, width x 600 mm depth with an effective span of eight m carries 2 concentrated loads of 15 kN at the one–third points in the span. Determine the subsequent using working stress method of design with M 20 grade concrete and Fe 415 grade reinforcement: i) maximum design moment due to concentrated loads and the self weight of the beam, ii) depth and area of tension reinforcement for the balanced part.
13.a) A cantilever R.C. beam of 4m span having 300 mm width and total depth of 600 mm contain 4 Fe 415 grade reinforcing bars of 20 mm diameter. Using working stress method of design with M 20 grade concrete and an effective cover of 35 mm compute the maximum uniformly distributed service load carried by the beam if reinforcement and concrete are fully stressed to their permissible values.
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13.b) A T beam floor slab of 125 mm flange thickness with 250 mm web width and 500 mm total depth contains 4 Fe 415 grade reinforcement bars of 16 mm diameter. The centre to center distance of T beams is four m. Using working stress method of design with M 20 grade concrete and an effective cover of 35 mm compute the subsequent if the effective span of the T beam is 6m: i) effective width of compression flange of the T beam; ii) true depth of neutral axis; balanced depth of neutral axis; iii) compressive force C above the neutral axis; iv) resisting moment of the part.
14.a) A reinforced concrete rectangular cantilever beam of three m span carries an imposed service load of 30 kN/m in addition to self weight. The width and total depth of the beam are 250.0 mm and 500 mm, respectively. Draw the shear force diagram indicating maximum shear force and its location from the support. Determine the subsequent using limit state method with an effective cover of 35 mm for tensile reinforcement: i) the distance of the critical part for the design shear force from the edge of the support, ii) spacing of eight mm diameter 2 legged stirrups of Fe 415 grade if the permissible shear stress in concrete is 0.4 Mpa., iii) maximum permissible spacing of vertical stirrups.
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14.b) A simply supported reinforced concrete beam of six m effective span carries 25 kN /m, in additional to its self weight. The width and overall depth of the beam are 250 mm and 450 mm, respectively. Draw the shear force diagram and determine the subsequent using limit state method with an effective cover of 35 mm: i) the distance of the critical part for design shear force, ii) design shear force if the permissible shear stress in concrete in 0.5 Mpa., and iii) spacing of eight mm diameter Fe 415 grade vertical stirrups, minimum area of vertical stirrups.
15.a) A cantilever roof slab of 2.5 m span and 3.5 m width carries a total load of 10.0 kPa including its self weight. Using limits state method with M 20 grade concrete and Fe 415 grade reinforcing bars determine the following: i) effective depth recommended from span to effective depth ratio for cantilever slabs, ii) effective depth needed for ultimate limiting moment, and iii) spacing of 10 diameter Fe 415 grade reinforcement bars at support, maximum permissible spacing of tensile reinforcement.
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15.b) A rectangular R.C. floor slab of effective spans 10 m x four m carries an imposed working load of seven kPa. Using limit state method of design with M 20 grade concrete and Fe 415 grade reinforcement determine the following: i) effective depth needed using the recommended span depth ratio without modification factor for tensile reinforcement, ii) ultimate load intensity on the slab assuming effective cover of 25 mm and load factor of 1.5, iii) spacing of 10 mm diameter rod of Fe 415 at the center of the slab in both directions. Use moment coefficients of 0.122 and 0.02 for short and long spans respectively.
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Earning: Approval pending. |