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A New Optimization Approach to Enhance Seismic Performance of Lead Rubber Bearing-Isolated Steel Moment-Resisting Frames Under Extreme Events


Affiliations
1 Department of Civil Engineering, Indian Institute of Technology, Kanpur 208 016, India
 

This study presents an optimal design approach of lead rubber bearings (LRBs) for frame structures. The proposed approach involves a bi-objective optimization problem by maximizing the isolation efficiency along with minimization of peak bearing displacement. Further, a varying weight factor approach is proposed to target multiple performance objectives under different hazard levels of ground excitation. The optimal yield strength of LRBs for the considered frames is selected such that the total deviation of both objectives with respect to their specified limits is within 5%. Finally, it has been demonstrated that the proposed approach is generic in nature and valid for different superstructure flexibility and damping when subjected to ground motions of varying hazard levels.

Keywords

Bi-Objective Optimization, Frame Structures, Ground Motions, Lead Rubber Bearings, Optimal Design, Yield Strength.
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  • Buckle, I. and Mayes, R., Seismic isolation: history, application, and performance – a world view. Earthq. Spectra, 1990, 6(2), 161–201; https://doi.org/10.1193/1.1585564

  • Deb, S. K., Seismic base isolation – an overview. Curr. Sci., 2004, 87(10), 1426–1430; https://www.jstor.org/stable/24109483.

  • Datta, T. K., Seismic Analysis of Structures, John Wiley and Sons (Asia) Pte Ltd, Singapore, 2010.

  • Villaverde, R., Fundamental Concepts of Earthquake Engineering, CRC Press, Boca Raton, 2009, 1st edn.

  • Roy, T. and Matsagar, V., Multi-hazard analysis and design guidelines: recommendations for structure and infrastructure systems in the Indian context. Curr. Sci., 2021, 121(1), 44–55; https://doi: 10.18520/cs/v121/i1/44-55

  • Roy, T. and Matsagar, V., Effectiveness of passive response control devices in buildings under earthquake and wind during design life. Struct. Infrastruct. Eng., 2019, 29(10), 2503–2513; https:// doi.org/10.1080/15732479.2018.1547768

  • Liu, M., Burns, S. A. and Wen, Y. K., Multiobjective optimization for performance-based seismic design of steel moment frame structures. Earthquake Eng. Struct. Dyn., 2005, 34(3), 289–306; https://doi.org/10.1002/eqe.426

  • Naeim, F. and Kelly, J. M., Design of Seismic Isolated Structures from Theory to Practice, John Wiley, New York, 1999.

  • Chakraborty, S., Roy, K. and Ray-Chaudhuri, S., Design of recentering spring for flat sliding base isolation system: theory and a numerical study. Eng. Struct., 2016, 126, 66–77; https://doi.org/ 10.1016/j.engstruct.2016.07.049

  • Jangid, R. S., Optimum friction pendulum system for near-fault motions. Eng. Struct., 2005, 27(3), 349–359; https://doi.org/10.1016/j.engstruct.2004.09.013

  • Zou, X. K., Integrated design optimization of base-isolated concrete buildings under spectrum loading. Struct. Multidiscip. Optim, 2008, 36(5), 493–507; https://doi.org/10.1007/s00158-007-0184-5.

  • Zou, X. K., Chan, C. M., Li, G. and Wang, Q., Multiobjective optimization for performance-based design of reinforced concrete frames. J. Struct. Eng., 2007, 133(10), 1462–1474; https://doi.org/10.1061/(ASCE)0733-9445(2007)133:10(1462)

  • Shinozuka, M., Ray-Chaudhuri, S. and Mishra, S. K., Shapememoryalloy supplemented lead rubber bearing (SMA-LRB) for seismic isolation. Probab. Eng. Mech., 2015, 41, 34–45; https:// doi.org/10.1016/j.probengmech.2015.04.004

  • Santa-Ana, P. R. and Miranda, E., Strength reduction factors for multi-degree-of-freedom systems. In Proceedings of the 12th World Conference on Earthquake Engineering, Auckland, New Zealand, 2000, pp. 1–8.

  • FEMA-451, NEHRP recommended provisions: design examples. Federal Emergency Management Agency, Washington DC, USA, 2006.

  • Hossain, M. R., Ashraf, M. and Padgett, J. E., Risk-based seismic performance assessment of yielding shear panel device. Eng. Struct., 2103, 56, 1570–1579; https://doi.org/10.1016/j.engstruct.2013.07.032

  • ICBO, Structural engineering design provisions. International Conference of Building Officials, California, USA, 1994.

  • OpenSees, OpenSees – Open system for earthquake engineering simulation. Pacific Earthquake Engineering Research Center, California, USA, 2017; http://opensees.berkeley.edu/

  • Somerville, P., Smith, N., Punyamurthula, S. and Sun, J., Development of ground motion time histories for phase 2 of the FEMA/ SAC steel project. Federal Emergency Management Agency, Washington DC, USA, 1997; http://www.sacsteel.org/project/

  • Skinner, R. I., Robinson, W. H. and McVerry, G. H., An Introduction to Seismic Isolation, Wiley Publishers, New York, 1993.

  • ASCE, Minimum design loads for buildings and other structures (ASCE/SEI 7-16). American Society of Civil Engineers, Reston, VA, USA, 2016.

  • NEHRP, NEHRP recommended provisions for seismic regulations for new buildings and other structures. National Earthquake Hazards Reduction Program, Building Seismic Safety Council, Washington DC, USA, 2000.

  • FEMA-356, Prestandard and commentary for the seismic rehabilitation of buildings. Federal Emergency Management Agency, Washington DC, USA, 2000.


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  • A New Optimization Approach to Enhance Seismic Performance of Lead Rubber Bearing-Isolated Steel Moment-Resisting Frames Under Extreme Events

Abstract Views: 377  |  PDF Views: 121

Authors

Jagajyoti Panda
Department of Civil Engineering, Indian Institute of Technology, Kanpur 208 016, India
Samit Ray-Chaudhuri
Department of Civil Engineering, Indian Institute of Technology, Kanpur 208 016, India

Abstract


This study presents an optimal design approach of lead rubber bearings (LRBs) for frame structures. The proposed approach involves a bi-objective optimization problem by maximizing the isolation efficiency along with minimization of peak bearing displacement. Further, a varying weight factor approach is proposed to target multiple performance objectives under different hazard levels of ground excitation. The optimal yield strength of LRBs for the considered frames is selected such that the total deviation of both objectives with respect to their specified limits is within 5%. Finally, it has been demonstrated that the proposed approach is generic in nature and valid for different superstructure flexibility and damping when subjected to ground motions of varying hazard levels.

Keywords


Bi-Objective Optimization, Frame Structures, Ground Motions, Lead Rubber Bearings, Optimal Design, Yield Strength.

References





DOI: https://doi.org/10.18520/cs%2Fv122%2Fi1%2F77-86