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A three hinged parabolic arch hinged at the crown and springings, has a horizontal span of 4.8 m and a central rise of 1 m. It carries a uniformly distributed load of 0.75 tonne per metre over half left hand span. The horizontal thrust at the support will be

10.8 tonnes
1.08 tonnes
1.8 tonnes
0.8 tonnes
none of these.

Correct Answer: 1.08 tonnes

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