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Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at ____________

(a) mid span

(b) supports

(c) every section

(d) quarter span

This question was addressed to me by my college professor while I was bunking the class.

Question is from Structural Designing and Thumb Rules in chapter Valuation, Reports Technical and Design Data of Civil Engineering Drawing

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Right option is (a) mid span

The explanation is: Since BM is maximum at midspan, design should be done for maximum bending moment so that it will take care for other section. Moment formula we are using is (wl2/8) which mid span moment.

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