aircraft hanger

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UDC 725.39(421) : 629.139.2 : 624.91 Structural aspects of the extension of a hangar for the BOAC at London Airport * N. J. PAYNE OBE BSc(Eng) MICE and t K. F. SHADBOLT AMlStructE Synopsis The paper describes the structural engineering aspects of the extension of British Overseas Airways Corporation’s wing hangar affecting the evolution of the final scheme are given, particularly at London Airport to receive the VClO aircraft. The basic factors with reference to future requirements. The reasons for the choice of reinforced lightweight concrete for the roof beams are stated, ComDarison is made between the Dermissible stresses adonted at and the development of the design in this medium is described. the &ne of the design and thosekow permitted by ameGdment No. 1 to CP 114 : 1957. In September 1960 the British Overseas Airways Corpora- tion appointed the then Frederick S. Snow & Partners as Consulting Engineers to prepare a design for the extension of their existing wing hangar in the south-east corner of their maintenance area at London Airport. The existing wing hangar, shown in Fig 1, was built in 1956 for the series of propeller aircraft culminating in the Britannia.Because the areas to be worked on were around the wings, and because of the length of the aircraft, the hangar was shortened for reasons of economy. The doors were shaped to fit the fuselage at the rear end to allow the tail to projectoutside the hangar. The Comet and Boeing 707 series of aircraft which replaced many of the Britanniaservices were maintained in other hangars, and whilst it was envisaged that Comet maintenance would take place in the wing hangar in the future, the main factor in the design of the extension was theintroduction of the VClO series of aircraft. The configuration of the VCIO, with its high-tail plane and engines mounted at the rear of the aircraft, required an extension on each side of the wing hangars of a bay depth of 68 ft with a clear height of 50 ft. The existing wing hangar was designed as two rein- forced concrete tied cantilevers projecting from the frame of the central workshop, and thus provided the ideal solution of large open areas uninterrupted by internal columns. Due to the cantilever construction, the existing hangars were not capable of extension without virtual complete rebuilding of the central structure, and it was also considered impractical to bridge the width of the hangar in one span of 564 ft for the extension, as construction depths for this span would be excessive. The width of the existing hangar was ideally suited to accommodate three VClOs side by side and the economies of introducing internal columns for the extension only, at third-points in the hangar width, was investigated. It is a well-known axiom that in aviation the keynoteisdevelopment and change and that the useful life of an aircraft rarelyexceeds ten years. It was, therefore,consideredprudent to examine the possible development of aircraft design in the future, inorder that the life of the hangar as extended would not be restricted to the life of one aircraft type. Consultation with the client established the probability that with the progressive increase in aircraft speeds, wing spans would decrease after a maximum wing span of 150 ft had been : L ;;;?kG; Fig l-Original wing hangar reached for subsonic aircraft. Table 1 shows the results of this investigation related to the numberof aircraft in each of the wing hangars and the final size of the aircraft. Therefore, to meet future requirements, it was essential that provision was made in the design of the extension to enable the alteration of the configuration of internal columns to produce three, four or five clear internal spans (Fig 2). As canbe seen fromTable 2 the decreasein wing span for aircraft of speeds of mach 2 .O-2 -2 is in some cases evenmore dramatic than that envisaged at the time of the preliminary designs, and the probable air- craft succeeding the Super VClO is the Concord, with a wing span of 80 ft at mach 2 -2 (approximately 1500 mile/h ground speed, cruising at 60,000 ft altitude). Table l-Relationship between Estimated Future Air- craft Dimensions and Number of Aircraft per Hangar Side Aircraft Wing span Length No. of aircraft (ft) (ft) per hangar side VC 10 146 159 3 Super VClO 146 172 3 Aircraft of mach 2-0-2.2 115 185 4 estimated Aircraft of mach 2-7-3.0 80 195 5 estimated Table %Relationship between Probable Future Aircraft Dimensions and Number of Aircraft per Hangar Side Aircraft Wing span Length No. of aircraft ~~ ~ ~~ ~~~~~~~~~ (W (ft) per hangar side Concord mach 2 -2 Boeing model 733, mach 2 $7 173 175 3 (swing wing) (extended) Lockheed L2000 116 222 4 - 78 170 5 mach 3 e0 TU.208 (No firm information available to date, but sinlilar to Concord) * Partner, Sir Frederick Snow & Partners. t Engineer, Sir Frederick Snow & Partners. Paper to be read before the Institution of Structural Engineers at 11 Upper Belgrave Street, London SW1 onThursday 11 November 1965 at 6 pm. THE STRUCTURAL ENGINEER NOVEMBER 1965 No 11 VOLUME 43 357

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