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Q. |
Calculate vertical prestressing force if wires of 5mm diameter with an initial stress of 1000n/mm2 are available for circumferential winding and Freyssinet cables made up of 12 wires of 8mm diameter stressed to 1200n/mm2 are to be used for vertical prestressing? |
A. | 15 |
B. | 12 |
C. | 8 |
D. | 4 |
Answer» B. 12 | |
Explanation: 5mm diameter wires stress is 1000n/mm2, 12 wires of 8mm diameter are stressed to 1200n/mm2, fc = (12x1000x200)/(1000) = 2400kn. |
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