- Prestress Concrete 1 (40.91 KiB) Viewed 28 times
prestress concrete
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answerhappygod
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prestress concrete
prestress concrete
USE OF LOAD BALANCING TO DETERMINE PRESTRESSING DETAILS A post-tensioned one-way slab is 300 mm thick and is to carry a superim- posed load of 12 kPa over a simply supported span of 10 metres. Determine the prestressing details to keep the slab level under its self-weight plus 4 kPa of live load. Take the total deferred losses as 18 per cent and the friction loss at mid-span as 5 per cent of the initial prestress ( Also, determine the load that causes decompression at the bottom fibres after the losses of prestress have occurred. Other Data For a one metre wide strip of slab: A = 300x10³ mm²/m Ig 1000×300³/12 = 2.25×10² mm*/m = = 1/(0.5D) = 2.25x102/(0.5×300) = 15.0×106 mm³/m Self-weight load: WG = 0.3 x 25 = Load to be balanced: wp 7.5 kN/m = 7.5+4 11.5 kN/m
USE OF LOAD BALANCING TO DETERMINE PRESTRESSING DETAILS A post-tensioned one-way slab is 300 mm thick and is to carry a superim- posed load of 12 kPa over a simply supported span of 10 metres. Determine the prestressing details to keep the slab level under its self-weight plus 4 kPa of live load. Take the total deferred losses as 18 per cent and the friction loss at mid-span as 5 per cent of the initial prestress ( Also, determine the load that causes decompression at the bottom fibres after the losses of prestress have occurred. Other Data For a one metre wide strip of slab: A = 300x10³ mm²/m Ig 1000×300³/12 = 2.25×10² mm*/m = = 1/(0.5D) = 2.25x102/(0.5×300) = 15.0×106 mm³/m Self-weight load: WG = 0.3 x 25 = Load to be balanced: wp 7.5 kN/m = 7.5+4 11.5 kN/m