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Explanation: The section may vary: http://en.wikipedia.org/wiki/Beam_(structure)
Beams are characterized by their profile (the shape of their cross-section), their length, and their material. In contemporary construction, beams are typically made of steel, reinforced concrete, or wood. One of the most common types of steel beam is the I-beam or wide-flange beam (also known as a "universal beam" or, for stouter sections, a "universal column"). This is commonly used in steel-frame buildings and bridges. Other common beam profiles are the C-channel, the hollow structural section beam, the pipe, and the angle(or angle).
Fabio Descalzi Uruguay Local time: 20:41 Specializes in field Native speaker of: Spanish PRO pts in category: 137 1 corroborated select project in this pair and field
Explanation: "correa-binding rafter/purlin/purline: Pieza longitudinal horizontal apoyada en armaduras o paredes transversales que sirve de apoyo a los cabios entre la cumbrera y el alero." Dicc. Visual de la Arquitectura, GG.