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Figure 8.1. Transmission length (lower design value lpt1) as a function of the concrete strength fck(t) at release. Initial prestress is 1000 MPa. Thick black line = EN, thick grey line = ENV, thin black line = MC90

Indented wires

'-wire strands

Good bond conditions

Gradual release

Bad bond conditions

Gradual release

1200 1400

Indented wires

'-wire strands

Good bond conditions

Bad bond conditions

1200 1400

Bad bond conditions

Sudden release

Bad bond conditions

Figure 8.2.Transmission length (lower design value lpt1) as a function of the initial prestress CTpi. Concrete strength at release is 40 MPa. Thick black line = EN, thick grey line = ENV,thin black line = MC90

Indented wires

7-wire strati di

Good bond conditions

Gradual release

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