Smart Structures and Systems

  • 제22권3호
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  • Pages.315-326
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  • 2018
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Identification of plastic deformations and parameters of nonlinear single-bay frames

  • Au, Francis T.K. (Department of Civil Engineering, The University of Hong Kong) ;
  • Yan, Z.H. (Department of Civil Engineering, The University of Hong Kong)
  • Received : 2015.08.24
  • Accepted : 2018.04.03
  • Published : 2018.09.25
⟨ 이전 논문 다음 논문 ⟩

Abstract

This paper presents a novel time-domain method for the identification of plastic rotations and stiffness parameters of single-bay frames with nonlinear plastic hinges. Each plastic hinge is modelled as a pseudo-semi-rigid connection with nonlinear hysteretic moment-curvature characteristics at an element end. Through the comparison of the identified end rotations of members that are connected together, the plastic rotation that furnishes information of the locations and plasticity degrees of plastic hinges can be identified. The force consideration of the frame members may be used to relate the stiffness parameters to the elastic rotations and the excitation. The damped-least-squares method and damped-and-weighted-least-squares method are adopted to estimate the stiffness parameters of frames. A noise-removal strategy employing a de-noising technique based on wavelet packets with a smoothing process is used to filter out the noise for the parameter estimation. The numerical examples show that the proposed method can identify the plastic rotations and the stiffness parameters using measurements with reasonable level of noise. The unknown excitation can also be estimated with acceptable accuracy. The advantages and disadvantages of both parameter estimation methods are discussed.

Keywords

References

  1. Al-Hussein, A. and Haldar, A. (2015a), "Novel unscented Kalman filter for health assessment of structural systems with unknown input", J. Eng. Mech. - ASCE, 141(7), 04015012. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000926
  2. Al-Hussein, A. and Haldar, A. (2015b), "Structural health assessment at a local level using minimum information", Eng. Struct., 88, 100-110. https://doi.org/10.1016/j.engstruct.2015.01.026
  3. Au, F.T.K., Jiang, R.J. and Cheung, Y.K. (2004), "Parameter identification of vehicles moving on continuous bridges", J. Sound Vib., 269(1-2), 91-111. https://doi.org/10.1016/S0022-460X(03)00005-1
  4. Au, F.T.K. and Yan, Z.H. (2008), "Dynamic analysis of frames with material and geometric nonlinearities based on the semirigid technique", Int. J. Struct. Stab. Dynam., 8(3), 415-438. https://doi.org/10.1142/S0219455408002727
  5. Burak, S. and Ram, Y.M. (2001), "Construction of physical parameters from modal data", Mech. Syst. Signal Pr., 15(1), 3-10. https://doi.org/10.1006/mssp.2000.1348
  6. Chakraverty, S. (2005), "Identification of structural parameters of multistorey shear buildings from modal data", Earthq. Eng. Struct. D., 34(6), 543-554. https://doi.org/10.1002/eqe.431
  7. Gindy, M., Nassif, H.H. and Velde, J. (2016), "Bridge displacement estimates from measured acceleration records", Transportation Research Record: Journal of the Transportation Research Board, No. 2028, Transportation Research Board of the National Academies, Washington, D.C., 2007, 136-145.
  8. Hasan, R., Xu, L. and Grierson, D.E. (2002), "Push-over analysis for performance-based seismic design", Comput. Struct., 80(31), 2483-2493. https://doi.org/10.1016/S0045-7949(02)00212-2
  9. Huang, H., Yang, Y. and Sun, L. (2015), "Parametric identification of a cable-stayed bridge using least square estimation with substructure approach", Smart Struct. Syst., 15(2), 425-445. https://doi.org/10.12989/sss.2015.15.2.425
  10. Kang, J.S., Park, S.K., Shin, S. and Lee, H.S. (2005), "Structural system identification in time domain using measured acceleration", J. Sound Vib., 288(1-2), 215-234. https://doi.org/10.1016/j.jsv.2005.01.041
  11. Lu, Z.R. and Law, S.S. (2007), "Identification of system parameters and input force from output only", Mech. Syst. Signal Pr., 21(5), 2099-2111. https://doi.org/10.1016/j.ymssp.2006.11.004
  12. Monforton, G.R. and Wu, T.S. (1963), "Matrix analysis of semirigidly connected frames", J. Struct. Div.- ASCE, 89(6), 13-42.
  13. Nagarajaiah, S. and Yang, Y. (2015), "Blind modal identification of output-only non-proportionally-damped structures by timefrequency complex independent component analysis", Smart Struct. Syst., 15(1), 81-97. https://doi.org/10.12989/sss.2015.15.1.081
  14. Park, J.H., Kim, J.T. and Yi, J.H. (2011), "Output-only modal identification approach for time-unsynchronized signals from decentralized wireless sensor network for linear structural systems", Smart Struct. Syst., 7(1), 59-82. https://doi.org/10.12989/sss.2011.7.1.059
  15. Park, S.K., Park, H.W., Shin, S. and Lee, H.S. (2008), "Detection of abrupt structural damage induced by an earthquake using a moving time window technique", Comput. Struct., 86(11-12), 1253-1265. https://doi.org/10.1016/j.compstruc.2007.11.003
  16. Shi, Z.Y., Law, S.S. and Li, H.N. (2007), "Subspace-based identification of linear time-varying system", AIAA Journal, 45(8), 2042-2050. https://doi.org/10.2514/1.28555
  17. Tikhonov, A.N. (1963), "Solution of incorrectly formulated problems and the regularization method", Soviet Mathematics, 4, 1035-1038.
  18. Wang, C., Ren, W.X., Wang, Z.C. and Zhu, H.P. (2014), "Timevarying physical parameter identification of shear type structures based on discrete wavelet transform", Smart Struct. Syst/, 14(5), 831-845. https://doi.org/10.12989/sss.2014.14.5.831
  19. Yang, J., Huang, H.W. and Pan, S.W. (2009), "Adaptive quadratic sum-squares error for structural damage identification", J. Eng. Mech. - ASCE, 135(2), 67-77. https://doi.org/10.1061/(ASCE)0733-9399(2009)135:2(67)
  20. Yang, J., Xia, Y. and Loh, C. (2014a), "Damage detection of hysteretic structures with a pinching effect', J. Eng. Mech.-ASCE, 140(3), 462-472. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000581
  21. Yang, J.N., Xia, Y. and Loh, C.H. (2014b), "Damage identification of bolt connections in a steel frame", J. Struct. Eng. - ASCE, 140(3), 04013064. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000831
  22. Yang, Y.B., Li, Y.C. and Chang, K.C. (2014), "Constructing the mode shapes of a bridge from a passing vehicle: a theoretical study", Smart Struct. Syst., 13(5), 797-819. https://doi.org/10.12989/sss.2014.13.5.797
  23. Ye, X., Yan, Q., Wang, W. and Yu, X. (2012), "Modal identification of Canton Tower under uncertain environmental conditions", Smart Struct. Syst., 10(4), 353-373. https://doi.org/10.12989/sss.2012.10.4_5.353
  24. Zhang, J., Yan, R.Q. and Yang, C.Q. (2013), "Structural modal identification through ensemble empirical modal decomposition", Smart Struct. Syst., 11(1), 123-134. https://doi.org/10.12989/sss.2013.11.1.123