A simply supported post-tensioned prestressed concrete beam of span L is prestressed by a straight tendon at a uniform eccentricity ‘e’ below the centroidal axis. If the magnitude of prestressing force is ‘P’ and flexural rigidity of beam is ‘EI’, the maximum central deflection of the beam is

\(\frac{{Pe{L^2}}}{{16\;EI}}\) (Downwards)

\(\frac{{Pe{L^2}}}{{8\;EI}}\) (Upwards)

\(\frac{{Pe{L^2}}}{{16\;EI}}\) (Upwards)

\(\frac{{Pe{L^2}}}{{8\;EI}}\) (Downwards)

A simply supported post-tensioned prestressed concrete beam of span L

1.	A simply supported post-tensioned prestressed concrete beam of span L is prestressed by a straight tendon at a uniform eccentricity ‘e’ below the centroidal axis. If the magnitude of prestressing force is ‘P’ and flexural rigidity of beam is ‘EI’, the maximum central deflection of the beam is
A.	\(\frac{{Pe{L^2}}}{{8\;EI}}\) (Upwards)
B.	\(\frac{{Pe{L^2}}}{{16\;EI}}\) (Downwards)
C.	\(\frac{{Pe{L^2}}}{{16\;EI}}\) (Upwards)
D.	\(\frac{{Pe{L^2}}}{{8\;EI}}\) (Downwards)
Answer» B. \(\frac{{Pe{L^2}}}{{16\;EI}}\) (Downwards)

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