curtailment of flanges

DESIGN OF STEEL

STRUCTURES -II

NITINVERMA

DEPARTMENT OF CIVIL ENGINEERING

MOB:8968751741

suryanitin.0077@gmail.com

Animated slides

CHAPTER-I

PLATE GIRDER

WHAT IS CURATILMENT?

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CUTTING

REDUCTION

DOCKINGLESSENING CUTBACK

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WHY

CURATILMENT?

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BEAM BEFORE BENDING

BEAM AFTER BENDING

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ON APPLICATION OF

UNIVERSALLY

DISTRIBUTED LOAD

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MAXIMUM BENDING

MOMENT(AT CENTER)

BENDING

MOMENT

DECREASES

BENDING

MOMENT

DECREASES

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AS BENDING MOMENT IS MAXIMUM AT CENTER AND

DECREASES AS WE APPROACH AT THE ENDS. THE

REQUIREMENTS OF PROVIDING PLATES AT END

DECREASES DUE TO LESSER BENDING MOMENT.

PROVIDING FLANGE COVER PLATES OTHER THAN THE

1SST FLANGE CCOVER PLATES TO FULL LENGTH

BECOMES UNECONOMICAL THEIRFORE FLANGE PLATES

ARE CURTAILED (EXCLUDING THE FIRST FLANGE COVER

PLATE )

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SPECIFICATIONS ALLOW THE FIRST FLANGE COVER PLATE OF A BOLTED

GIRDER TO BE CARRIED THROUGH THE LENGTH OF THE GIRDER TO

SERVE THE FOLLOWING PURPOSES:

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For a welded plate girder, however, the curtailment

of flange plate consists in reducing the thickness of

flange plate in proportion to the moments along the

span. At regions where bending moment is less than

that at the critical section, the thickness of plate can

be reduced (curtailed). The minimum section

classification at each such curtailed section,

however, must also be satisfied in addition to the

safety check for bending strength.

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University Civil Engineering Department