Seismic Behavior of the Blue Mosque of Tabriz-Iran

Abstract eng:
Blue Mosque of Tabriz is one of the largest brick constructions created by Iranian architects in the fifteenth century. It was built and completed in 1465. The dome-shaped roof of mausoleum and the main and auxiliary domes of mosque, which collapsed during a major earthquake in 1780, were rebuilt in 1973. This paper presents a preliminary study on seismic behavior of the roof of mausoleum and the main dome of the Blue (Kabood) Mosque of Tabriz. These masonry domes are assumed intact and have modeled by solid finite elements. The modal analysis of the model shows that the behavior is symmetrical in the two main directions. A response spectrum seismic analysis was carried out for two different seismic hazard levels; DBE= 0.35g (return period of 75 years) and MCE=0.45g (return period of 475 years) according to seismic hazard map of Iran (IIEES). Results show that the domes can resist the seismic forces, based on the design spectra for Iran, for both design earthquakes with minor damage but tension cracks would develop into the pendentives. Hence, a seismic pushover analysis of the domes was performed to investigate the development of the crack patterns.

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