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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.
Dimples in Polytetrafluoroethylene (PTFE) PTFE is a fluorocarbon polymer that possesses good chemical resistance and can function in a wide range of temperature. The most signi
Explain the Frame member's effective lengths 1. Effective length is a product of an effective length factor (k) and the actual length of the column. 2. k depends on th
friction problems
A square pile group of 9 piles passes by a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 90 cm centre to centre. If the unconfin
Explain the Well Drawdown Equations Watch the units, especially if you use log 10 or ln. h 1 = aquifer thickness minus the drawdown (ft) r 1 = distance from well (ft
Compatibility Condition: Total strain in steel = Total strain in copper i.e. 3 × 10 -4 + 1.965 × 10 -5 P s = 4.5 × 10 -4 + 1.8421 × 10 -5 P c Recognising that P
which section is most effective for a design of beam and why
Importance of poles in critical load combinations The poles are generally designed for the following critical load combinations : (a) Bending due to wind load on the cable
Determine the elastic settlement of a rectangular foundation, 6 m × 12 m, on a uniform sand with E = 20,000 kN/m 2 and Poisson's ratio, = 0.2. The contact pressure is 200 kN/m 2
Backward curved vanes vs. forward curved vanes in pumps Power of a pump is related to discharge as follows: Power = k 1 Q + (k 2 Q 2 / tan A) Where K 1 and K 2 are
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