a soft envelope whose internal volume is supplied with atmospheric air from pumping equipment (fans, blowers, or compressors) to provide stability and resistance to external loads (supporting capacity). The first such structures were used in 1946 by the engineer W. Bird (USA) for the housing of a radar antenna structure. They subsequently became popular in many countries.
The envelopes of pneumatic structures are made of industrial fabrics coated with polymers, including rubber, or from reinforced films. Threads of synthetic fibers, or less frequently glass fibers, provide the reinforcement for the films and fabrics.
Pneumatic structures are divided into two types: air-supported structures, in which air under low pressure (excess pressure, 0.1–1 kilonewton per sq m [kN/m2]) is fed directly under the envelope, and air-inflated structures, in which air under high pressure (excess pressure, 30–700 kN/m2) fills only the supporting elements of the structure.
In the erection of air-supported pneumatic structures, the envelope is tightly fastened to the foundation. Airlocks are constructed for entering and leaving the building. Air-inflated structures are subdivided into inflated-frame and inflated-panel types. Also in use are hybrid envelopes of air-supported and supporting structures, as well as reinforcing cables, nets, stays, and membranes.
The advantages of pneumatic structures are light weight, the possibility of covering large spans without internal supports, complete prefabrication, rapid assembly, portability, transparency to light and radio waves, and low cost. Their disadvantages are the need for continuous maintenance of excess pressure in the envelope, the relatively short service life, and the poor fire resistance and acoustic insulation.
The use of pneumatic structures is expedient for permanent and temporary buildings for a variety of purposes (production and storage areas, as well as halls for performances, sports, trade, or exhibitions), mobile buildings (maintenance stations, medical aid stations, clubhouses, and libraries), transportation and hydro-engineering structures (bridges, dams, and gates), and auxiliary facilities in performing construction work (hoists, winter shelters, and formwork).
REFERENCESOtto, F., and R. Trostel. Pnevmaticheskie stroitel’nye konstruktsii. Moscow, 1967. (Translated from German.)
Pnevmaticheskie konstruktsii vozdukhoopornogo tipa. Moscow, 1973.
Dent, R. N. Principles of Pneumatic Architecture. London, 1971.
V. V. ERMOLOV