As per Indian Railway Board, the impact factor i (also known as coefficient of dynamic augment, CDA) in steel girders for single track span is

\(\left[ {0.75 + \frac{6}{{\left( {8 + L} \right)}}} \right] \not > 1.0\)

\(\left[ {0.15 + \frac{8}{{6 + L}}} \right] \not > 1.0\)

\(\left[ {0.15 + \frac{6}{{8 + L}}} \right] \not > 1.0\)

\(\left[ {0.75 + \frac{8}{{6 + L}}} \right] \not > 1.0\)

As per Indian Railway Board, the impact factor i (also known as coeffi

1.	As per Indian Railway Board, the impact factor i (also known as coefficient of dynamic augment, CDA) in steel girders for single track span is
A.	\(\left[ {0.15 + \frac{8}{{6 + L}}} \right] \not > 1.0\)
B.	\(\left[ {0.75 + \frac{6}{{\left( {8 + L} \right)}}} \right] \not > 1.0\)
C.	\(\left[ {0.15 + \frac{6}{{8 + L}}} \right] \not > 1.0\)
D.	\(\left[ {0.75 + \frac{8}{{6 + L}}} \right] \not > 1.0\)
Answer» B. \(\left[ {0.75 + \frac{6}{{\left( {8 + L} \right)}}} \right] \not > 1.0\)

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As per Indian Railway Board, the impact factor i (also known as coefficient of dynamic augment, CDA) in steel girders for single track span is

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