Question

Match List -I (Post - tensioning system) with List - II (Type of anchorage) and select the correct answer using the codes given below the lists:

List- I
A. Freyssient
B. Gifford-Udall
C. Lee-McCall
D. Magnel Blaton

List- II
1. Flat steel wedges in sandwich plates
2. High strength nuts
3. Split conical wedges
4. Conical serrated concrete wedges
Codes:
A B C D

• A. $2143$
• B. $4321$
• C. $2341$
• D. $4123$

Answer 1

The correct option is B $4321$

In the Freyssinet system anchorage consists of cylinder of good quality concrete and is provided with corrugations on the outside. It has a central conical hole and is provided with heavy top reinforcement.

In Gifford-Udall system, the wire are stressed and anchored one by one in a separate cylinder using small wedding grip called Udall grips. Each grip consists of two split cones.
In Lee Mc Call system anchoring of bars is done by screwing special threaded nuts. The nuts bear against a distribution plate provided at the end of the beam.

In the Magnel Blaton system, the wires are anchored by wedging, two at a time into sandwich plates. The sandwich plates are provided with two wedge shaped grooves on its two faces. The wires are taken into each groove and tightened. Then a steel wedge is driven between the tightened wires to anchor them against the plate.