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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros
Loss of Structural Capacity of Frame Type Buildings affected by Tunnel Induced Settlements
S.U. Dikmen and A.M. Turk
Civil Engineering Department, Istanbul Kultur University, Turkey
S.U. Dikmen, A.M. Turk, "Loss of Structural Capacity of Frame Type Buildings affected by Tunnel Induced Settlements", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 168, 2009. doi:10.4203/ccp.91.168
Keywords: tunnels, settlement, seismic, structural capacity, reinforced concrete frame, pushover analysis.
The main target of this study is to evaluate the margin of reduction in the seismic capacity of medium rise concrete frame buildings with shallow single footing type foundations subject to settlements caused by tunnel constructions.
In the past, valuable research has been conducted by various researchers to determine the effects of surface settlements on existing buildings and the limiting values of slope of the settlement trough [1,2,3,4,5,6,7]. However, these studies were mainly concentrated on the structural integrity and damage levels of the buildings under static conditions after tunnel excavations. Also the data presented and the limiting values proposed were mostly related to masonry type structures.
In this study, the decrease in the seismic capacity of medium rise concrete frame buildings is investigated through a two stage calculation procedure. First, the settlement trough shape is calculated by an empirical method and then these settlements are applied to the finite element model of the building. Pushover analyses have been performed on the structure both for settled and unsettled cases.
The results of the study indicate that when the maximum settlement exceeds 50.0mm, the buildings within the settlement trough may have a seismic capacity reduction of 5 to 15% depending on the location of the building and the magnitude of the maximum settlement. However, for settlements less than 50.0mm the reduction in the seismic base shear capacity will be limited to 5%.
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