Reinforcement in continuous beams

[dsav]

Homework Statement

I have been asked to provide a detailed reinforcement plan for a continuous beam.

This beam has the following dimensions: h=180mm, b=500mm and l=5400mm. The supports are three and located at 200 (roller), 2700 (pinned) and 5200 (roller)mm, creating two equal spans. The loading will occur in the middle of each midspan (1450mm & 3950mm for 0 the beginning of the beams length).

Concretes maximum gravel size is 16mm.

Homework Equations

Knowing that the beam will face both tension and compression, reinforcement on the top and the bottom of the beam must be applied.

My main problems are: 1. what and how many bars should I choose, 2. What concrete cover should I have, 3. what distance between the bars.

The Attempt at a Solution

I have been asked to provide several different proposals, either with continuous bars or with bars placed over the middle support and at the bottom of the midspans. I want to have both highly reinforced beams and a lightly reinforced.

Any ideas?

Thank you in advance!

 

[Valkarie]

For the highly reinforced beam, you could use a total of 8 bars (4 on the top and 4 on the bottom). The bar size should be 12mm in diameter and the concrete cover should be at least 50mm. For the spacing of the bars, you could use a spacing of 100mm between bars. For the lightly reinforced beam, you could use a total of 4 bars (2 on the top and 2 on the bottom). The bar size should be 10mm in diameter and the concrete cover should be at least 40mm. For the spacing of the bars, you could use a spacing of 200mm between bars.