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What Lap length required for M20 concrete with Fe 500steel for beams and columns

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What Lap length required for M20 concrete with Fe 500 steel for beams and columns

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45 to 50 times of their diameter.
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A overhanginging beam( equal overhang on both side(a) ) is subjected to udl over its entire length(L). to get equal bending moment at support and at mid span, what should be the overhanging length with respect to L (i.e. xL, what is the value of x)
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