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Keywords: seismic systems, input energy, steel structures, nonlinear dynamic analysis, bracing system, time history analysis.

Summary

During an earthquake, input energy in a structure can be used as a criterion to assess the seismic performance of a structure. Although the displacement is of importance for structures with a long period that undergo a few small yield cycles, the input energy is also an important factor in seismic evaluation of structures with a short and medium period [1].

There are two methods for the evaluation of input energy of structures:

the absolute energy method, and
the relative energy method [2].

Theses methods are both illustrated in this paper. The relative energy method is adopted for the evaluation of the input energy of structures and the total input energy of structures are compared at the time when the earthquake is over and the motion of structure is damped out.

In this study, the input energy of a SMRF (Special Moment Resistant Frame), a SCBF (Special Concentric Braced Frame), a flexural EBF (Eccentric Braced Frame) with hinge connections (EBF(H)), a flexural EBF (Eccentric Braced Frame) with rigid connections (EBF(R)), a flexural KBF (Knee Braced Frame), a RBS ( Reduced Beam Section) and a BRBF (Buckling Restrained Braced Frame) system are compared.

The Perform software along with three earthquake records (El Centro, Imperial Valley and Tabas) is used for the nonlinear time history analysis of the frames. The P-Delta effect is included in the analysis. The action-deformation of the nonlinear component is assumed to be elastic perfectly plastic. The effects of the PGA variation and the height of the frames is also considered in this study. The results show that, the magnitude of the input energy to the RBS system is the smallest of all and the magnitude of the input energy to the KBF system is the greatest of all.

References

1: Fajfar P. and Fischinger M., "A seismic design procedure including energy concept", Proceedings of the 9th European Conference on Earthquake Engineering, Moscow, (1990), P 312-321.
2: Uang C.M., "Use of energy as a design criterion in earthquake-resistant design", Report EERC No.UCB/EERC-88/18, Earthquake Engineering Research Center, University of California, Berkeley, 1988.

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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: 81 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping Paper 220 A Comparison of Input Energy in Different Lateral Force Resisting Systems M. Tehranizadeh and M. Torabi Department of Civil and Enviroment Engineering, Amir Kabir University of Technology, Tehran, Iran doi:10.4203/ccp.81.220 purchase the full-text of this paper Full Bibliographic Reference for this paper M. Tehranizadeh, M. Torabi, "A Comparison of Input Energy in Different Lateral Force Resisting Systems", in B.H.V. Topping, (Editor), "Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 220, 2005. doi:10.4203/ccp.81.220 Keywords: seismic systems, input energy, steel structures, nonlinear dynamic analysis, bracing system, time history analysis. Summary During an earthquake, input energy in a structure can be used as a criterion to assess the seismic performance of a structure. Although the displacement is of importance for structures with a long period that undergo a few small yield cycles, the input energy is also an important factor in seismic evaluation of structures with a short and medium period [1]. There are two methods for the evaluation of input energy of structures: the absolute energy method, and the relative energy method [2]. Theses methods are both illustrated in this paper. The relative energy method is adopted for the evaluation of the input energy of structures and the total input energy of structures are compared at the time when the earthquake is over and the motion of structure is damped out. In this study, the input energy of a SMRF (Special Moment Resistant Frame), a SCBF (Special Concentric Braced Frame), a flexural EBF (Eccentric Braced Frame) with hinge connections (EBF(H)), a flexural EBF (Eccentric Braced Frame) with rigid connections (EBF(R)), a flexural KBF (Knee Braced Frame), a RBS ( Reduced Beam Section) and a BRBF (Buckling Restrained Braced Frame) system are compared. The Perform software along with three earthquake records (El Centro, Imperial Valley and Tabas) is used for the nonlinear time history analysis of the frames. The P-Delta effect is included in the analysis. The action-deformation of the nonlinear component is assumed to be elastic perfectly plastic. The effects of the PGA variation and the height of the frames is also considered in this study. The results show that, the magnitude of the input energy to the RBS system is the smallest of all and the magnitude of the input energy to the KBF system is the greatest of all. References 1 Fajfar P. and Fischinger M., "A seismic design procedure including energy concept", Proceedings of the 9th European Conference on Earthquake Engineering, Moscow, (1990), P 312-321. 2 Uang C.M., "Use of energy as a design criterion in earthquake-resistant design", Report EERC No.UCB/EERC-88/18, Earthquake Engineering Research Center, University of California, Berkeley, 1988. 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 £135 +P&P)
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