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Performance enhancement of SDOF system for a two-way all-fixed RC slab based on a modified plastic-damage hysteretic model

  • 투고 : 2021.02.07
  • 심사 : 2021.09.08
  • 발행 : 2021.11.25

초록

This study proposes an enhanced single-degree-of-freedom (SDOF) system for a two-way all-fixed reinforced concrete (RC) slab. Thus, this study aims to improve the performance of the conventional SDOF system to the level of finite element (FE) analysis. The conventional SDOF system makes incorrect prediction about structural dynamic deflections when a damage occurs during SDOF analysis, because a resistance of the conventional SDOF system cannot reflect stiffness and strength degradation due to damages. In other words, the conventional SDOF model utilizes the inelastic model regardless of its damage occurrence, as the hysterical model. Therefore, it is essential to enhance the SDOF system to minimize the errors. To this end, this study newly utilizes a Modified Plastic-Damage Hysteretic Model (MPDHM) as a resistance function of the SDOF system. Since the MPDHM can reflect stiffness and strength degradation due to damages, the enhanced SDOF system can conduct more reliable predictions than the conventional SDOF system. In order to apply the MPDHM in the SDOF system, its parameter estimation should be preferentially performed based on a number of reference data. For this reason, a series of FE analyses are carried out utilizing commercial S/W (i.e., AUTODYN). The performance of the enhanced SDOF system is numerically validated about a two-way all-fixed RC slab under the different stand-off distances with an identical explosive weight.

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참고문헌

  1. Castedo, R., Segarra, P., Alanon, A., Lopez, L.M., Santos, A.P. and Sanchidrian, J.A. (2015), "Air blast resistance of full-scale slabs with different compositions: Numerical modeling and field validation", Int. J. Impact Eng., 86, 145-156. https://doi.org/10.1016/j.ijimpeng.2015.08.004.
  2. Dragos, F. and Wu, C. (2015), "Single-degree-of-freedom approach to incorporate axial load effects on pressure impulse curves for steel columns", J. Eng. Mech., 141(1), 1-10. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000818.
  3. Fabio, M.A. (2019), "A plastic-damage hysteretic model to reproduce strength stiffness degradation", Bull. Earthq. Eng., 1, 3517-3544. https://doi.org/10.1007/s10518-019-00606-3.
  4. Feldgun, V.R., Yankelevsky, D.Z. and Karinski, Y.S. (2016), "A nonlinear SDOF model for blast response simulation of elastic thin rectangular plates", Int. J. Impact Eng., 88, 172-188. https://doi.org/10.1016/j.ijimpeng.2015.09.001.
  5. Hamra, L., Demonceau, J.F. and Denoel, V. (2015), "Pressure-impulse diagram of a beam developing non-linear membrane action under blast loading", Int. J. Impact Eng., 86, 188-205. https://doi.org/10.1016/j.ijimpeng.2015.07.003.
  6. Hou, X., Cao, S., Rong, Q. and Zheng, W.A. (2018), "P-I diagram approach for predicting failure modes of RPC one-way slabs subjected to blast loading", Int. J. Impact Eng., 120, 171-184. https://doi.org/10.1016/j.ijimpeng.2018.06.006.
  7. Joosep, L. (2002), "Dynamic behavior of concrete structures subjected to blast and fragment impacts", Department of Structural Engineering Concrete Structures, Chalmers University of Technology.
  8. Krauthammer, T. (2008), Modern Protective Structures, LL C ed. Suite: CRC Press Taylor & Francis Group.
  9. Liu, Y., Yan, J. and Huang, F. (2018), "Behavior of reinforced concrete beam and columns subjected to blast loading", Defence Technol., 14, 550-559. https://doi.org/10.1016/j.dt.2018.07.026.
  10. Malvar, L.J. and Crawford, J.E. (1998), "Dynamic increase factors for steel reinforcing bars", Twenty-Eighth DDESB Seminar August 98, Orlando, FL.
  11. Morison, C.M. (2006), "Dynamic response of walls and slabs by single-degree-of-freedom analysis-a critical review and revision", Int. J. Impact Eng., 32, 1214-1247. https://doi.org/10.1016/j.ijimpeng.2004.11.008.
  12. Oswald, C.J. and Skerhut, D. (1993), FACEDAP User's Manual, Omaha District: Southwest Research Institute and U.S. Army Corps of Engineers.
  13. Sara, J.G. and Ying, T. (2012), "Structural performance of reinforced concrete flat plate buildings subjected to fire", Int. J. Concrete Struct. Mater., 6(2), 111-121. https://doi.org/10.1007/s40069-012-0011-2.
  14. Thiagarajan, G., Kadambi, A.V., Robert, S. and Johnson, C.F. (2015), "Experimental and finite element analysis of doubly reinforced concrete slabs subjected to blast loads", Int. J. Impact Eng., 75, 162-173. https://doi.org/10.1016/j.ijimpeng.2014.07.018.
  15. U.S. Army Corps of Engineers (2008), "Single degree of freedom structural response limits for antiterrorism design", PDC TR-06-08, 1.1-5.4.
  16. UFC-3-340-02 (2008), "Structures to resist the effect of accidental explosions", US Department of the Army, Navy and the Air Force, Washington, DC.
  17. Wang, W., Zhang, D. and Lu, F. (2012), "The influence of load pulse shape on pressure-impulse diagrams of one-way RC slabs", Struct. Eng. Mech., 42(3), 363-381. http://doi.org/10.12989/sem.2012.42.3.363.
  18. Wang, W., Zhang, D., Lu, F. and Liu, R. (2013), "A new SDOF method of one-way reinforced concrete slab under non-uniform blast loading", Struct. Eng. Mech., 46(5), 595-613. https://doi.org/10.12989/sem.2013.46.5.595.