if the given beam section is used for a simply supported beam 6.5 m span, using f'c=21MPa and fy=280MPa. 1. Calculate the ultimate shear strength of concrete (kN) using simplified formula of NCSP 2015. 2. calculate the nominal shear strength of the stirrups, Vs, in kN. 3. calculate the design sectional shear strength of the beam in kN.

A simply supported post-tension beam as shown in Figure (1), span length is 14m, carries a uniformly distributed service live load of 10 kN/m. Find the value and location of initial pre-stress force (Pi), so that the mid span stresses in concrete at top fiber is zero at initial stage and zero stress at bottom fiber in service stage. Total losses in pre-stressed force are 15%. 100 200 100 750 100 400 Typical Cross section. Figure (1)