Studies on the domical structure through the period of Late-Antique and Early -Medieval era on the basis of the architectural survey of Hagia Sop hia, Istanbul

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1) Structural deformations relating to the principal structural elements -main piers, buttresses, pendentives, northern and southern great arches-of Hagia Sophia have been clarified through a series of analyses of mesh data and contour maps of the inner surface of the structure. Values of the displacement and angles of the inclination since the first completion of the church up to the present were calculated. 2) A pair of setting lines on the dome cornice were analyzed. The analysis has shown the marked similarity between the deformation of the dome cornice itself and that of dome base abutting the pendentives from the outside. Through the analysis, the initial horizontal form of the dome on the level of the cornice was fixed. 3) Inclination of the buttresses and that of great arches were proved to be correspondent. 4) The amount of the additional correction of the inclined vertical inner face of the main arches was calculated. 5) The double arches on the north and south act as one unified structure. 6) The deformations of the tympana to the north and south were calculated using newly acquired data and contour maps( on the scale of 1 to 50). 7) A contour map (on the scale of 1 to 50) of the dome of Hagios Sergius and Bacchus has been made by the photogrammetry carried out in 1992.