How big is the beam with a span of 8 meters and how to configure the steel bars?

The beam section height can be 600 mm ~ 800 mm, and the beam width can be 250 mm ~ 300 mm The reinforcement configuration can be calculated according to the upper As=390mm2, and the reinforcement can meet the requirements with 4E 12.

According to the website of building information, the height of beam section can be 600 mm ~ 800 mm, and the width of beam can be 250 mm ~ 300 mm, and the reinforcement configuration can usually be calculated according to the upper As=390mm2, with 4E 12, and the reinforcement meets the requirements. As=bhw0.2%=354mm2, the calculation structure of waist reinforcement is 6d 10, and the reinforcement meets the requirements. If the top is a normal layer of high blocks, it is recommended to use at least four 25 or six 20 or six 22 blocks, and it is best to use three-grade rebar.