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http://dx.doi.org/10.12989/sss.2014.14.6.1055

Compensation techniques for experimental errors in real-time hybrid simulation using shake tables  

Nakata, Narutoshi (Department of Civil and Env. Engineering, Clarkson University)
Stehman, Matthew (Department of Civil Engineering, Johns Hopkins University)
Publication Information
Smart Structures and Systems / v.14, no.6, 2014 , pp. 1055-1079 More about this Journal
Abstract
Substructure shake table testing is a class of real-time hybrid simulation (RTHS). It combines shake table tests of substructures with real-time computational simulation of the remaining part of the structure to assess dynamic response of the entire structure. Unlike in the conventional hybrid simulation, substructure shake table testing imposes acceleration compatibilities at substructure boundaries. However, acceleration tracking of shake tables is extremely challenging, and it is not possible to produce perfect acceleration tracking without time delay. If responses of the experimental substructure have high correlation with ground accelerations, response errors are inevitably induced by the erroneous input acceleration. Feeding the erroneous responses into the RTHS procedure will deteriorate the simulation results. This study presents a set of techniques to enable reliable substructure shake table testing. The developed techniques include compensation techniques for errors induced by imperfect input acceleration of shake tables, model-based actuator delay compensation with state observer, and force correction to eliminate process and measurement noises. These techniques are experimentally investigated through RTHS using a uni-axial shake table and three-story steel frame structure at the Johns Hopkins University. The simulation results showed that substructure shake table testing with the developed compensation techniques provides an accurate and reliable means to simulate the dynamic responses of the entire structure under earthquake excitations.
Keywords
real-time hybrid simulation; substructure shake table testing; acceleration tracking; actuator delay compensation; force correction in hybrid simulation;
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1 Gunay, M.S. and Mosalam, K.M. (2012), "Investigation of the response of electrical insulator posts using real-time hybrid simulation on a smart shaking table", Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal.
2 Carrion, J. and Spencer, B.F. (2007), Model-based strategies for real-time hybrid testing, NSEL report, University of Illinois at Urbana-Champaign, NSEL-006.
3 Carrion, J.E., Spencer, B.F. and Phillips, B.M. (2009), "Real-time hybrid simulation for structural control performance assessment", Earthq. Eng. Eng. Vib., 29(8), 481-492.
4 Christenson, R., Lin, Y., Emmons, A. and Bass, B. (2008), "Large-scale experimental verification of semiactive control through real-time hybrid simulation1", J. Struct. Eng. - ASCE, 134(4), 522-534.   DOI
5 Dyke, S., Spencer, B., Quast, P. and Sain, M. (1995), "Role of control-structure interaction in protective system design", J. Eng. Mech. - ASCE, 121(2), 322-338.   DOI   ScienceOn
6 Lee, S., Parka, E., Mina, K. and Park, J. (2007), "Real-time substructuring technique for the shaking table test of upper substructures", Eng. Struct., 29(9), 2219-2232.   DOI
7 Igarashi, A., Iemura, H. and and Suwa, T. (2000), "Development of substructured shaking table test method", Proceedings of the 12th World Conference on Earthquake Engineering, Auckland, New Zealand.
8 Igarashi, A., Sanchez-Flores, F., Iemura, H., Fujii, K. and Toyooka, A. (2009). "Real-time hybrid testing of laminated rubber dampers for seismic retrofit of bridges", Proceedings of the 3rd International Conference on Advances in Experimental Structural Engineering, San Francisco, USA.
9 Ji, X, Kajiwara, K, Nagae, T, Enokida, R. and Nakashima, M. (2009), "A substructure shaking table test for reproduction of earthquake responses of high-rise buildings", Earthq. Eng. Struct. D., 38(12), 1381-1399.   DOI
10 Nakashima, M., Kato, H. and Takaoka, E. (1992), "Development of real-time pseudo dynamic testing", Earthq. Eng. Struct. D., 21(1), 79-92.   DOI
11 Nakata, N. (2010), "Acceleration tracking control for earthquake simulators", Eng. Struct., 32(8), 2229-2236.   DOI
12 Nakata, N. (2012), "A multi-purpose earthquake simulator and a flexible development platform for actuator controller design", J. Vib. Control, 18(10), 1552-1560.   DOI
13 Nakata, N. and Stehman, M. (2012), "Substructure shake table test method using a controlled mass:formulation and numerical simulation", Earthq. Eng. Struct. D., 41(14), 1977-1988.   DOI
14 Phillips, B.M. and Spencer, B.F. (2011), "Model-based feedforward-feedback actuator control for real-time hybrid simulation", J. Struct. Eng. - ASCE, 139, 1205-1214.
15 Nakata, N. and Stehman, M. (2014), "Substructure shake table testing of 10-story RTHS structure", Network for Earthquake Engineering Simulation (NEES)(distributor). Dataset. DOI: 10.4231/D3ST7DX1R.
16 Neild, S.A., Stoten, D.P., Drury, D. and Wagg, D.J. (2005), "Control issues relating to real-time substructuring experiments using a shaking table", Earthq. Eng. Struct. D., 34(9), 1171-1192.   DOI
17 Pan, P., Nakashima, M. and Tomofuji, H. (2005), "Online test using displacement-force mixed control", Earthq. Eng. Struct. D., 34(8), 869-888.   DOI
18 Shao, X., Reinhorn, A.M. and Sivaselvan, M.V. (2011), "Real-time hybrid simulation using shake tables and dynamic actuators", J. Struct. Eng. -ASCE, 137(7), 748-760.   DOI
19 Spencer, B. and Yang, G. (1998), "Earthquake simulator control by transfer function iteration", Proceedings of the 12th ASCE Engineering Mechanics Conference, San Diego, USA.
20 Stehman, M. and Nakata, N. (2012), "Direct acceleration feedback control of shake tables with force stabilization", J. Earthq. Eng., 17(5), 736-749.
21 Stoten, D. P. and Gomez, E. (2001), "Adaptive control of shaking tables using the minimal control synthesis algorithm", Philos. T. R. Soc. A, 359(1786), 1697-1723.   DOI
22 Twitchell, B. and Symans, M. (2003), "Analytical modeling, system identification, and tracking performance of uniaxial seismic simulators", J. Eng. Mech. - ASCE, 129(12), 1485-1488.   DOI   ScienceOn
23 Zapateiro, M,. Karimi, H.R., Luo, N. and Spencer, B.F. (2010), "Real-time hybrid testing of semi active control strategies for vibration reduction in a structure with MR damper", Struct. Control Health Monit., 17(4), 427-451.