Analytical study of the effect of the presence of a reinforced concrete dome on the seismic behavior of a frame building of reinforced concrete

الملخص

Reinforced concrete domes are an architectural and civil feature of many reinforced concrete structures such as religious centers, silos, tanks, halls, and other facilities. The research deals with a seismic analytical study of a symmetrical reinforced concrete frame building in the third seismic zone, with thin crust on its upper floor consisting of a spherical reinforced concrete dome carried on short columns. The analysis was carried out according to the successive push method (nonlinear static method) using the structural analysis program ETABS-2016. The seismic characteristics of the structure were compared before and after adding the reinforced concrete dome, and these characteristics are the base shear strength of the structure V, the floor shear strength of the bearing floor of the dome F, The main role of vibration T and the corresponding mass contribution ratio m%, the number of joints formed in the building when moving the target in addition to monitoring the appearance of the first plastic jointز The number of studied models reached 10, ten models, five groups in each group, a reference model without a dome and another with a dome, and the groups differ from each other in the number of floors, which ranged between (3-5-10-19-15) floors. The results showed that adding the dome to the building has a great benefit in delaying the appearance of the first plastic joint in the reference building that is not bearing the dome, while the effect of adding the dome and its bearing elements on the building was not significant on the base shear strength of the building according to the method used until the rest of the characteristics were affected (Strength Floor shear, elastic joints, mass contribution ratio...) was significant, and the largest increase in floor shear strength was about 7.3% for the 15-storey sample.