1
GATE CE 1991
MCQ (Single Correct Answer)
+2
-0.6
A prestressed concrete beam has a cross-section with the following properties: Area $$A = 46,000\,\,m{m^2},$$ $${\rm I} = 75.8 \times {10^7}\,\,m{m^4},$$ $${Y_{bottom}} = 244\,\,mm,$$ $${Y_{top}} = 156\,\,mm.$$ It is subjected to a prestressing force at an eccentricity $$'e'$$ so as to have a zero stress at the top fibre. The value of $$'e'$$ given by
A
$$66.66$$ $$mm$$
B
$$66.95$$ $$mm$$
C
$$104.72$$ $$mm$$
D
$$133.33$$ $$mm$$
2
GATE CE 1990
MCQ (Single Correct Answer)
+2
-0.6
A rectangular simply supported prestressed concrete beam of span $$L$$ is subjected to a prestressing force of $$P$$ acting centrally at end sections and the prestress tendons are parabolically draped with maximum eccentricity of $${e_{\max }}$$ at the mid span section. The uniformly distributed upward load $$(W)$$ on the beam due to prestressing will be:
A
$$16\,\,P\,{e_{\max }}/{L^2}$$
B
$$4\,\,P\,{e_{\max }}/{L^2}$$
C
$$12\,\,P\,{e_{\max }}/{L^2}$$
D
$$8\,\,P\,{e_{\max }}/{L^2}$$
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Fluid Mechanics and Hydraulic Machines
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