English to Spanish Tech/Engineering Construction / Civil Engineering

Hola:
En el texto original, hall-type structure se contrapone a multi-storey structure, pero por las imágenes que he visto creo no se trata exactamente de una estructura de un solo nivel. ¿Alguna idea? Añado el contexto:

Hall-type structures
If a column is damaged, the acceptable extent of local damage is the length of the main beams supported by the column times the distance between main beams multiplied by two. If the main beams are on the external wall line, the allowable local damage area may be half of the above surface area. The damage may occur on one storey only.
If a main beam is damaged, the allowable extent of local damage is the length of the main beams times the distance between main beams multiplied by two. If the main beams are on the external wall line, the acceptable local damage area may be half of the above surface area. The damage may occur on one storey only.

¡Muchas gracias por vuestras sugerencias!