The most significant distinction in Hagia Sophia’s structural plan is that its size and estimations are a lot bigger than different places of worship, and the focal dome is a lot greater and higher. The vault that is over the focal space is 55.60 m. from ground level, 31.87 m. from North to South and 30.87 m. from East to West. While developing Hagia Sophia, draftsmen have utilized marble, stone and unique blocks that were light yet tough, exceptionally made of Rhodes soil.
The dome that seemed compacted and spread out when it was first developed, has been harmed in August 553 and December 557 because of quakes and in May 7, 558 the Eastern piece of the arch has totally self-destructed. The redesign of the vault has been done by Isidoros’ nephew, youthful Isidoros. Isidoros has tackled the issue by introducing emotionally supportive networks through outer props and helped the structure by including forty windows and expanding the lenght of the arch by seven meters to make it littler and lighter.
Hagia Sophia has endure a major flame in 859 and a tremor in 869. The vault has crumpled after a seismic tremor in 989 and has been fixed. Because of the seismic tremors in 1344 and 1346 a piece of the vault and parts of the curve have crumpled and have been fixed.
The remodel procedure that has begun by Fatih Sultan Mehmed during the Ottoman time frame has been proceeded by the accompanying Sultans also. The most significant fix directed in Hagia Sophia was by Sultan Abdulmecid’s (1839– 1861) arranges in 1847-1849 by the Swiss Fossati siblings. This fix incorporated the filling of huge splits on the arch just as verifying the vault’s edge by executing steel circles. Amid the remodels, a standout amongst the most significant calligraphist’s of his time, Kazasker Mustafa Izzet Efendi has composed the 35th stanza of the quran on the fundamental vault.