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Pre-tensioning systems
In the previous unit we have seen different steps in a pretensioning operation. Tendon wires or strands (formed as a rope type arrangement made of several tendon wires) are stretched and concrete is cast in the moulds, as shown in Figure. When sufficient strength is gained by concrete due to hardening, tendon wires may be cut from outside and jacks may be removed.
construct parabolic shapes using the envelop method and the offset method with dimensions 80 by 120
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A circular footing is resting on a stiff saturated clay with qu = 250 kN/m 2 . The depth of foundation is 2 m. Verify the diameter of the footing if the column load is 600 kN. S
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