DYNA ^® Anchorages with Epoxy Coated Strands

Based on the DYNA Bond ^® and DYNA Grip ^® Systems, DSI can also offer stay cables using epoxy coated strands.

Epoxy Coated Strand

Epoxy coated strand is manufactured in compliance with ISO 14655:1999. The cold-drawn 7 -wire strand is coated with epoxy resin in the shop. The interstices between the 7 wires are completely filled with epoxy resin thus providing an excellent and robust long-time corrosion protection. The epoxy material also reduces fretting action between the individual wires and cushions adjacent strands in deviation areas. Due to the good bond of the epoxy with the steel wires and combined with the ductile behavior of the epoxy material, the possibility of damage to the corrosion protection barrier during stressing is eliminated.

The 3-part wedges are specially designed for epoxy coated strands. The teeth penetrate through the coating so that they grip into the wires of the strand. Fatigue tests conducted on single-strand tendons have proven a dynamic stress range of up to 260 N/mm² (upper stress 0.45 GUTS at 2 million load cycles).

DVWIDAG Extradosed Tendons

DYWIDAG Stay Cables can also be used for extradosed tendons. In case of high-stress amplitudes, the strands are anchored with DYNA Bond ^® or DYNA Grip ^® Anchorages.
In case of low amplitudes, a special anchorage based on DYWIDAG External Tendons was developed. The picture shows a DYWIDAG Extradosed Cable Type XD-E with an adjustable elastomer bearing incorporating epoxy coated strands.

The DYWIDAG Extradosed Cables are replaceable, restressable and destressable.

A saddle construction as already described can also be used.