How wide, how high and how many steel bars do you need for an 8-meter girder?

Liang Kuan is generally 1/2 to 1/3 of the beam height.

Strengthening can be roughly like this. The concrete strength grade is C25, the beam section is 240×500, the longitudinal reinforcement is Grade II steel (HRB335), and the stirrup is Grade I steel (HPB235). 2 longitudinal steel bars at the upper part of the beam, with a diameter of14 mm; Five longitudinal bars with a diameter of 28 in the lower part of the beam are arranged in two rows, three in the lower row and two in the upper row; Four waist tendons with a diameter of 14mm (two on each side of the beam) are set on the beam side, and they are bound with lacing with a diameter of 6mm and a spacing of 300 mm; The stirrup is 8mm in diameter and the spacing is 150. Arrange the entire length of the beam.