Guardrail is the name given to the protective structures attached to the surroundings of stairs, terraces, ramps, balconies, balconies, openings, walkways, corridors, mezzanines and others. They are installations with the purpose of ensuring the physical integrity of those who circulate in these places, avoiding falls.
 These structures are rigorously tested in the laboratory, in order to evaluate the vertical and horizontal static efforts, and the ability to withstand impacts. In the impact tests, a load of 600 joules is usually placed on the structure, so that it deforms and the glass or other protection of the gaps is broken.