Response of tall buildings with symmetric setbacks under blast loading
Jayatilake, I.N. , Dias, W.P.S. , Jayasinghe, M.T.R., & Thambiratnam, D.P. (2010) Response of tall buildings with symmetric setbacks under blast loading. Journal of the National Science Foundation of Sri Lanka, 38(2), pp. 115-123.
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This study explores three-dimensional nonlineardynamic responses of typical tall buildings with and without setbacks under blast loading. These 20 storey reinforced concrete buildings have been designed for normal (dead, live and wind)loads. The influence of the setbacks on the lateral load response due to blasts in terms of peak deflections, accelerations, inter-storey drift and bending moments at critical locations (including hinge formation) were investigated. Structural response predictions were performed with a commercially available three-dimensional finite element analysis programme using non-linear direct integration time history analyses. Results obtained for buildings with different setbacks were compared and conclusions made. The comparisons revealed that buildings have setbacks that protect the tower part above the setback level from blast loading show considerably better response in terms of peak displacement and interstorey drift, when compared to buildings without setbacks. Rotational accelerations were found to depend on the periods of the rotational modes. Abrupt changes in moments and shears are experienced near the levels of the setbacks. Typical twenty storey tall buildings with shear walls and frames that are designed for only normaln loads perform reasonably well, without catastrophic collapse, when subjected to a blast that is equivalent to 500 kg TNT at a standoff distance of 10 m.
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|Item Type:||Journal Article|
|Keywords:||Blast Loading, Dynamic Analysis, Hinge Formation, Setbacks, Tall Buildings|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Urban Development
|Copyright Owner:||Copyright 2010 Journal of National Science Foundation of Sri Lanka|
|Deposited On:||10 Dec 2010 08:39|
|Last Modified:||11 Aug 2011 00:56|
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