The dimensions of a beam can vary based on the size of the span, but the size refers to the width and height. Based on standard 6118, the minimum width for a reinforced concrete beam is 12 cm. This video shows details on how to estimate the dimensions of the beam, the beam's own weight, types of reinforcement and details about stirrups. ???? MINICOURSE TRACE THE DRAW - Learn how to calculate the concrete mix at a time with a step-by-step guide http://estruturasebim.com/comece-por-... ???????? Revit 2023 Complete + Bonus - UNPUBLISHED https://bit.ly/Revit2023Completo ???? Visit our website and secure your materials https://estruturasebim.com ⭕ EQUIPMENT AND BOOK: ????Notebook I use to design WITHOUT FREEZING: https://amzn.to/3zuIkEH ⌨️ Calculator model I use to calculate: https://amzn.to/3oqi0oP ???? ????Book Calculation and Detailing of Usual Reinforced Concrete Structures: https://amzn.to/3jfyFbX Hello, how are you? The beam is an element used to receive the load from the slabs, and the weight of the slab ends up being unloaded on the beams, the beams distribute it to the pillars and the pillars end up transferring it to the foundations. Furthermore, the concrete standard 6118 recommends that the minimum width of the beam is 12 cm, but this dimension should be used based on a pre-dimensioning. Thus, the standard does not establish an exact height or value to adopt at the beginning, but some bibliographies recommend a usual value for pre-dimensioning based on the beam's arrangement. For a double-supported beam, to estimate the initial height, it is enough to use 1/10 of the span; for a cantilevered beam, the height will be based on 1/5 of the span; for a continuous beam, it depends on the internal and external spans. However, these width and height values ​​are for an initial calculation; the value is only corrected based on the verifications. Another point: the weight of a beam can be estimated with the ratio of 1 meter of the span, where the material's own weight should be used and multiplied by the dimensions of the beam. Depending on the height, concrete beams must use specific reinforcements, where the longitudinal reinforcement helps combat bending moments, while the transverse reinforcement is the famous stirrups, which help combat shear forces. Therefore, the stirrups must have a steel gauge of at least 5 mm. In the video, I show guidelines for the maximum spacing of the stirrups. The maximum spacing should include Vrd, which is the design shear force, and VRd2, which is the design requesting shear force. In this sense, the relationship between Vrd and VRd2 should compare the values ​​to follow a calculation hypothesis. This is some information about the dimensions of a beam. Enjoy and watch the videos in the Structures First Steps series. Best regards, Eng. Pedro Rodrigues