Breaking

Friday, 23 November 2018

PRESTRESSING : Properties of HT Strand (IS : 14268 - 1995)

A Steel member that is prestressed and embedded in concrete, loses the initially applied stress exponentially with the passage of time. The utmost important factor attributing to this loss in stress is the stress relaxation property of the steel itself. By treating the steel through a thermomechanical process known as stabilising, the propensity of the steel to relax under a stressed condition is controlled to a great extent. Some of the main advantages that our customers derive by using low relaxation strands are listed below :

  • Upto 10% reduction in steel requirement is possible.
  • Saving in number of anchorages, ducts, sheathings, wedges and labour resulting in overall reduction of project cost.
  • Reduction in concrete requirement due to reduced size of structural members.
  • Thermo-mechanical processing during manufacture of LRPC Strands produces a nearly straight strand, thereby eliminating necessity for extra post straightening treatment. 

Applications : Prestressed Concrete Girders for road, river & railway bridges & flyovers, prestressed concrete domes, buildings, silos, hangars, aquaducts, viaducts & railway sleepers.

Properties of HT Strand (IS : 14268 - 1995)



Class of HT Strand


Nominal Dia (mm)

Tolerance in Dia (mm)

Nominal Area (mm2)

Nominal Mass (Kg/M)

Breaking Strength (KN)

0.2 % Proof Load (KN)


Minimum Tensile Strength (N/mm2)

Modulus of Elasticity (N/mm2)






I

9.5


±0.4

51.6

0.405

89.0

80.1






1860






195000

11.1


±0.4

69.7

0.548

120.1

108.1

12.7


±0.4

92.9

0.73

160.1

144.1
15.2

±0.4

139.4

1.094

240.2

216.2







II


9.5


+0.66 / -0.15

54.8

0.432

102.3

92.1






1860






195000

11.1


+0.66 / -0.15

74.2

0.582

137.9

124.1

12.7


+0.66 / -0.15

98.7

0.775

183.7

165.3

15.2


+0.66 / -0.15

140

1.102

260.7

234.6

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