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Keywords: non linear viscous damping, passive energy dissipation devices, viscoelastic dampers, seismic building retrofit, seismic dampers, reduction of vibrations, seismic isolation.

Summary

The application of fluid viscous dampers as part of energy dissipation systems for civil engineering structures has been investigated in the past years. Many structures have demonstrated significant improvements without involving major building modification thanks to these energy dissipation devices.

A fluid viscous damper develop a force which is a function of the relative velocity between its ends. Depending on the nature of this function, the viscous dampers may be linear when the force is proportional to the velocity or non linear when it is not. Linear viscous dampers lead to excellent structural performances for regular seismic events but when the structure is subjected to high relative velocities, forces in the dampers may be extremely high and unpractical. In these cases, non linear dampers imply lower forces for the same velocities.

This paper describes a comparative numerical investigation on a multi-story steel moment resisting frame subjected to the ground acceleration. The structural response is analysed by means of a non-linear finite element code and the dynamic equation of motion is integrated by the Newmark Constant Acceleration method. In order to improve the structural performance, the structure is retrofitted with fluid viscous dampers and the effect of the non linearity in these devices is investigated.

In order to be able to compare the several configurations analysed, a performance and a force indices are defined. Finally an optimum non-linear solution is obtained.

In the paper it is shown that even though the use of non linear viscous dampers may lead to a poorer structural performance, an optimal solution between reducing the damper forces and worsening the structural behaviour may be achieved.

The main objectives of this investigation are: studying the negative structural implications of the non-linear viscous dampers, defining simple performance indices to numerically compare different structural responses and developing a procedure for being able to find the best non-linearity in the dampers that leads to admissible forces and a feasible structural performance

References

1: Haskell, G., Lee, D., "Fluid Viscous Damping as an Alternative to Base Isolation", Taylor Devices, Inc.
2: Constantinou, M.C., Symans, M.D., "Experimental and Analytical Investigation of Seismic Response of Structures with Suplemental Fluid Viscous Dampers", Report NCEER-92-0032, State University of New York at Buffalo. 1992.
3: Reinhorn, A.M., Constantinou, M.C., "Experimental and Analytical Investigation of Seismic Retrofit of Structures with Suplemental Damping, Part 1-Fluid Viscous Devices", Report NCEER-95-0001, State University of New York at Buffalo. 1995.
4: Peckan, G., Mander, J.B., Chen, S.S., "Fundamental Considerations for the design of non-linear viscous dampers", Earthquake Engineering and Structural Dynamics, 28, 1405-1425, 1999. doi:10.1002/(SICI)1096-9845(199911)28:11<1405::AID-EQE875>3.3.CO;2-1
5: Terenzi, G., "Dynamics of SDOF with Nonlinear Viscous Damping", Journal of Engineering Mechanics, (125), pp. 956-963. 1999. doi:10.1061/(ASCE)0733-9399(1999)125:8(956)
6: Carr, A.J., "Ruamoko - Inelastic Dynamic Analysis Program", Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand. 1998.
7: Tsai, K.C., Popov, E.P., "Steel beam-column joints in seismic moment resisting frames", Report No. UCB/EERC-88/19, Earthquake Engineering Research Center, University of California, Berkeley, CA. 1998.
8: Hall, J.F., "Parameter Study of the response of moment-resisting steel frame buildings to near-source ground motions", Technical report SAC95-05: "Parametric analytical investigation of ground motion and structural response. Northridge Earthquake of January 17, 1994. Sacramento, CA", 1.1- 1.83 1995.
9: ICBO, "Uniform Building Code", Vol. 2. International Conference of Building Officials, Whittier, CA. 1994.
10: ISC, "Load and Resistance Factor Design specification for structural buildings", American Institute of Steel Construction, Inc., Chicago, IL. 1993.
11: Federal Emergency Management Agency. FEMA 356, "Prestandard and Commentary for the Seismic Rehabilitation of Buildings", Washington D.C. 2000.

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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: 75 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar Paper 46 A Comparative Investigation in Linear and Non-linear Fluid Viscous Dampers for Seismic Applications M.D. Martinez-Rodrigo and M.L. Romero Department of Technology, University Jaume I, Castellon, Spain doi:10.4203/ccp.75.46 purchase the full-text of this paper Full Bibliographic Reference for this paper M.D. Martinez-Rodrigo, M.L. Romero, "A Comparative Investigation in Linear and Non-linear Fluid Viscous Dampers for Seismic Applications", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 46, 2002. doi:10.4203/ccp.75.46 Keywords: non linear viscous damping, passive energy dissipation devices, viscoelastic dampers, seismic building retrofit, seismic dampers, reduction of vibrations, seismic isolation. Summary The application of fluid viscous dampers as part of energy dissipation systems for civil engineering structures has been investigated in the past years. Many structures have demonstrated significant improvements without involving major building modification thanks to these energy dissipation devices. A fluid viscous damper develop a force which is a function of the relative velocity between its ends. Depending on the nature of this function, the viscous dampers may be linear when the force is proportional to the velocity or non linear when it is not. Linear viscous dampers lead to excellent structural performances for regular seismic events but when the structure is subjected to high relative velocities, forces in the dampers may be extremely high and unpractical. In these cases, non linear dampers imply lower forces for the same velocities. This paper describes a comparative numerical investigation on a multi-story steel moment resisting frame subjected to the ground acceleration. The structural response is analysed by means of a non-linear finite element code and the dynamic equation of motion is integrated by the Newmark Constant Acceleration method. In order to improve the structural performance, the structure is retrofitted with fluid viscous dampers and the effect of the non linearity in these devices is investigated. In order to be able to compare the several configurations analysed, a performance and a force indices are defined. Finally an optimum non-linear solution is obtained. In the paper it is shown that even though the use of non linear viscous dampers may lead to a poorer structural performance, an optimal solution between reducing the damper forces and worsening the structural behaviour may be achieved. The main objectives of this investigation are: studying the negative structural implications of the non-linear viscous dampers, defining simple performance indices to numerically compare different structural responses and developing a procedure for being able to find the best non-linearity in the dampers that leads to admissible forces and a feasible structural performance References 1 Haskell, G., Lee, D., "Fluid Viscous Damping as an Alternative to Base Isolation", Taylor Devices, Inc. 2 Constantinou, M.C., Symans, M.D., "Experimental and Analytical Investigation of Seismic Response of Structures with Suplemental Fluid Viscous Dampers", Report NCEER-92-0032, State University of New York at Buffalo. 1992. 3 Reinhorn, A.M., Constantinou, M.C., "Experimental and Analytical Investigation of Seismic Retrofit of Structures with Suplemental Damping, Part 1-Fluid Viscous Devices", Report NCEER-95-0001, State University of New York at Buffalo. 1995. 4 Peckan, G., Mander, J.B., Chen, S.S., "Fundamental Considerations for the design of non-linear viscous dampers", Earthquake Engineering and Structural Dynamics, 28, 1405-1425, 1999. doi:10.1002/(SICI)1096-9845(199911)28:11<1405::AID-EQE875>3.3.CO;2-1 5 Terenzi, G., "Dynamics of SDOF with Nonlinear Viscous Damping", Journal of Engineering Mechanics, (125), pp. 956-963. 1999. doi:10.1061/(ASCE)0733-9399(1999)125:8(956) 6 Carr, A.J., "Ruamoko - Inelastic Dynamic Analysis Program", Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand. 1998. 7 Tsai, K.C., Popov, E.P., "Steel beam-column joints in seismic moment resisting frames", Report No. UCB/EERC-88/19, Earthquake Engineering Research Center, University of California, Berkeley, CA. 1998. 8 Hall, J.F., "Parameter Study of the response of moment-resisting steel frame buildings to near-source ground motions", Technical report SAC95-05: "Parametric analytical investigation of ground motion and structural response. Northridge Earthquake of January 17, 1994. Sacramento, CA", 1.1- 1.83 1995. 9 ICBO, "Uniform Building Code", Vol. 2. International Conference of Building Officials, Whittier, CA. 1994. 10 ISC, "Load and Resistance Factor Design specification for structural buildings", American Institute of Steel Construction, Inc., Chicago, IL. 1993. 11 Federal Emergency Management Agency. FEMA 356, "Prestandard and Commentary for the Seismic Rehabilitation of Buildings", Washington D.C. 2000. 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 £125 +P&P)
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