Curves Introduction

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About Railway Curves

Transcript of Curves Introduction

  • CURVES WHY ? WHAT ? PARAMETERS ??

  • NECESSITY ARISES DUE TO PHYSICAL & GEOGRAPHICAL FEATURESNECESSARY EVIL.CURVE IS A LINE OF WHICH NO PART IS STRAIGHT AND WHICH CHANGES DIRECTION WITHOUT ANGLE.POSITIVE IMPEDIMENT FOR HIGHER SPEEDS.

  • ANGULARITY OF AXLE WHILE NEGOTIATING A CURVEPLAY HELPS THE WHEEL NEGOTIATE CURVEA BOGIE WHICH CAN TAKE RADIAL POSITION ON THE CURVES IS BETTERGUIDANCE SHALL BE FROM THE TRACK GUIDANCE AND NOT FLANGE CONTACT

  • CURVE DESIGNATION CURVES ARE DESIGNATED BY THEIR RADII,EXCEPT ON IR & US RAIL ROAD. ON IR DEGREE OF CURVE --- FOR DESIGNATION. - RADII FOR CALCULATION DEGREE OF CURVE IS THE ANGLE SUBTENDED BY 30.5m CHORD AT THE CENTRE. D=1750/R.

  • RELATION BETWEEN DEGREE AND RADIUS OF THE CURVETHE VALUE OF DEGREE CAN BE FOUND OUT ,as indicated below- Angle subtended by 2Rm Length i.e; circumference=360 Or Angle subtended by 1 m Length i.e; circumference =360/ 2R Or Angle subtended by an arc of 30.5m= 360X30.5/ 2R=1746.81/R Say 1750/R

  • Deflection angleIntersection angleRApex distancetangentTT

  • Deflection angleIntersection angleRApex distanceTangentSS/2T1TTTransition length

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