High Strength Friction Grip Bolts For Bridge Construction

DESIGN OF BOLTED CONNECTION USING HIGH STRENGTH FRICTION BOLTS

The “Connections” are critical components of steel structure as they have the potential for greater variability in behaviour and strength. They are more complex to design than the members and are usually the most vulnerable components in the structural system, consequent of geometric imperfection, complexity of connection geometry and residual stress and strains.The “connection” are normally made either by riveting bolting or by welding.Normally the “Riveted Connections” are of bearing type and the “Bolted connections”

are of both bearing type as well as friction type. In our Railway bridges, “Riveted Connections” are being used in all type of situation. But it is seen that the “Riveted Connections” fail where repetitive dynamic loads are experienced. In the “repetitive dynamic loads” situation, the “HSFG Bolts” are better substitute of Rivets.

   AS per IS-1367-1979, the “HSFG Bolts” shall be of two property class 8.8 or 10.9,which have different strength and other characteristics. The dimensional details of these “HSFG Bolts” (M16 to M36 dia bolts) are furnished in the IS-3757-1985.Similarly the dimensional details of high strength nuts and washers are also furnished in the IS-6623-1985 and IS-6649-1985 respectively.

The “HSFG bolt connection” can take more load, so the number of the required “HSFG Bolts” are reduced compare to the “Rivet connection”. In the repetitive dynamic loading condition, the stresses/ “stress ranges” in the “HSFG bolt connection” are much lower then “Rivet connection”, the fatigue life of the “HSFG

bolt connection” will be much more than the “Rivet connection”. In fact the member/plate will fail earlier then the “HSFG bolt connection” in fatigue condition.So the “HSFG bolt connection” is much suitable at the location where dynamic forces are excessive and there are frequent failure of “Rivet connection”.

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