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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 108
PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping
Paper 120

Vertical Seismic Load Effects on the Response of Structures with Toggle Brace Dampers

H. Al-Rifaie1, A. Glema2 and M. Malendowski2

1Salahaddin University, Erbil, Kurdistan, Iraq
2Poznan University of Technology, Poznan, Poland

Full Bibliographic Reference for this paper
H. Al-Rifaie, A. Glema, M. Malendowski, "Vertical Seismic Load Effects on the Response of Structures with Toggle Brace Dampers", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 120, 2015. doi:10.4203/ccp.108.120
Keywords: nonlinear structural response, seismic load, time-history analysis, finite element, Simulia Abaqus FEA, toggle-brace dampers, floor accelerations, inter-story drifts.

Summary
Earthquakes; such as the 1995 Kobe, 1994 Northridge and 1986 Kalamata earthquakes, show that the vertical component contributes a destructive energy and even exceeds the horizontal component effects. For that reason Earthquake Hazards Reduction Programs, such as the one run by the US National Institute of Standards and Technology, are highlighting the need for modelling vertical ground motion effects in nonlinear analysis. Consequently, the aims of the study, reported in this paper, are to analyse the combined vertical and horizontal components of the earthquake effects on floor drift and acceleration response in a steel frame structure. The structure is an eight story three bay steel "moment resisting frame" located in Bucharest. Toggle-brace dampers and diagonal viscous damper were used as energy dissipation devices. The structure model is prepared and analysed using the Simulia Abaqus FEA software, as the non-linear finite element general purpose system. Three earthquake records were applied to the model. The selected records have strong vertical ground motions with field evidence of their damage to structural and non-structural elements. A total of sixteen tests were conducted throughout this research. One test was devoted for frequency analysis, three for quantifying critical damping and twelve for seismic response. Simulation results show the difference in the efficiency of the selected dampers in reducing floor accelerations and drifts. Furthermore, the structural response is assessed for the Eurocode Damage limit state. This research provides a novel in-depth focus on structural response and mitigating damage induced by vertical seismic excitations.

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