RCC Structures Design

231. To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than

1. b/3
2. b/4
3. b/5
4. b/6

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232. Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of

1. 0.1 L from the outer edge of column
2. 0.1 L from the centre edge of column
3. Half the distance of projection
4. One-fourth the distance of projection

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233. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of

1. h/4
2. h/3
3. h/2
4. 2h/3

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234. Total pressure on the vertical face of a retaining wall of height 'h' per unit run exerted by the retained earth weighing 'w' per unit volume, is

1. wh [(1 - sin φ)/(1 + sin φ)]
2. wh² [(1 - sin φ)/(1 - sin φ)]
3. wh² [(1 - sin φ)/2(1 - sin φ)]
4. wh² [(1 - sin φ)/3(1 - sin φ)]

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235. With usual notations the depth of the neutral axis of a balanced section, is given by

1. mc/t = (d - n)/n
2. t/mc = (d - n)/n
3. t/mc = (d + n)/n
4. mc/t = n/(d - n)

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