11 A prestressed concrete beam of effective span 16 m is of rectangular section 400 mm wide by 1200 mm deep. The tendons consist of 3300 mm² of strands of characteristic strength 1700 N/mm², with an effective prestress of 910 N/mm². The strands are located 870 mm from the top face of the beam. Iff = 60 N/mm², estimate the flexural strength of the section as per British Code provisions for the following (b) Unbonded tendons cases: (a) Bonded tendons

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