Dynamic Characteristics of Large Reinforced Concrete Domes

Abstract eng:
The United Arab Emirates (UAE) is adjacent to the Iranian plateau which is one of the most seismically active areas of the world. Recently, Northern Emirates have been affected directly by seismic activities in Zagros Fault Belt and other faults in the region. Qeshm (South Iran) earthquake of November 27, 2005 of magnitude 5.9 in the Richter scale and its several after shocks sent waves that shock buildings in major UAE cities including Dubai, Sharjah and Ras Al-Khaima and sent hundreds of thousands of rattled residence to the streets. Large span reinforced concrete domes with different shapes (spherical, ellipsoidal and paraboloidal) are becoming increasing common roof structures, especially in modern government buildings, mosques and university buildings. Behavior of large span reinforced concrete domes under earthquake loading and the interaction between these domes and the rest of the structure is not well studied. This issue did not receive much attention by the research community due to the scarcity of such structures worldwide. To assess the seismic vulnerability of buildings with large domes, the dynamic characteristics and behavio r of large reinforced concrete domes with long spans need to be studied and their susceptibility to damage need to be evaluated. This paper, specifically presents a parametric study of reinforced concrete domes and the effect of the variation of their thickness, height and span on their dynamic characteristics such as frequencies of vibration. This study presents the first step towards the assessment of seismic vulnerability of buildings with large reinforced concrete domes.

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