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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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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	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 doi:10.4203/ccp.108.120 purchase the full-text of this paper 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. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £75 +P&P)
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