Performance Improvement of Masonry Infill Walls Strengthened With Steel Wall-Post Under Different Charges & Different Distances of Explosion Loading

Document Type : Original Article

Authors

1 Civil Eng. Department, Jundi-shapur University of Technology, Dezful, Iran

2 Civil Eng Department, Jundi-shapur University of Technology, Dezful, Iran

Abstract

With the increase in explosive attacks and the need for defensive preparedness, it is possible to consider strategies to improve the safety and resilience of non-structural members and their efficiency. In this paper, the nonlinear performance of a reinforced concrete frame with non-structural steel wall-reinforced interlayer under blast load is investigated. For this, in the first step, a concrete frame with steel wall-reinforced masonry frames, according to the latest recommendation of the Iranian seismic design code, in ABAQUS finite element software under the load of two explosive charges of 300 and 1000 kg by equivalent pressure method. The blast was located at distances of 5, 10, and 15 meters from the base of the structure, and the relative displacement response between the interfaces and the dissipated energy in the whole model were studied. In the second step, the necessity of strengthening this system has been discussed by adopting two strategies: increasing the cross-sectional number of wall-posts and reducing the distances of wall-posts. The results show that the relative displacement of peer-to-peer in the model with the strategy of increasing the cross-sectional number of wall-posts, at the expense of 1000 kg and 300 kg at a distance of 5 m by increasing the angle cross-section from L60x60x6 mm to L80x80x8 mm by 34.20%, respectively. And decreased by 48.25%. This reduction was achieved in the model with the strategy of reducing the distances of the wall posts at the expense of 1000 and 300 kg at a distance of 5 meters, respectively 5.51% and 3.53%, which was more than 2 times the amount of reduction of the first strategy. Also, the depleted energy in the model with the strategy of reducing distances compared to the model with a cross-section of L80x80x8 mm under 1000 kg explosion, more than 2.4 has been obtained.

Keywords

Main Subjects

References

[1] Organization for Development, Renovation and Equipping Schools of I.R. Iran (DRES), (2013). “Instruction of Design and Construction For Unreinforced Walls”, Technical Assistant and Supervision, Office of Technology, Research and Retraining for Schools of I.R. Iran.
[2] Building and Housing Research Center, (2014). “Iranian Code of Practice for Seimic Resistant Design of  Buildings (Standard No. 2800), 4th Edition”, I.R. IRAN Ministry of Housing and Urban Development, Tehran, Iran.
[3] Akhtarshenas, A., Behshad, A., Paknejadi, AA. (2014). The difference between infilled-wall frames & non infilled-wall frames in nonlinear static analysis. National Conference on Civil Engineering and Architecture.
[4] El-Dakhakhni, W,W. Nonlinear Finite Element Modeling of Concrete Masonry-in filled Steel Frame, MSc thesis, Drexel University, Philadelphia, 2000.
[5] Management and Planning Organization of Iran, (2013) Instruction for seismic rehabilitation of existing buildings, Journal number 360.
[6] Hamed, E., Rabinovitch, O. (2010). Failure characteristics of FRP-strengthened masonry walls under out-of-plane loads, Engineering Structures 32, 2134-2145.
[7] Baker, J.F., Leader Williams, E. and Lax, P. (1948) "The design of  framed buildings against high explosive bombs", The Civil Engineer in War, UK Institution of Civil Engineers, London, p. 80.
[8] UFC (Unified Facilities Criteria). (2008). Structures to resist the effects of accidental explosions, USA Department of defense.
[9] Codina, R., Ambrosini, D. and Borbon, F. (2016). Alternative to prevent to failure of RC member under close-in blast loading. Engineering Failure Analysis, 60, 96-106.
[10] Remennikov, A.M. (2003). A review of methods for predicting bomb blast effects on buildings, Journal of  Battle field Technology, 6(3), 155-161.
[11] Ngo, T., Mendis, P., Gupta, A. and Ramsay, J. (2007). Blast loading and blast effects on structure, The University of Melbourne, Australia.
[12] Parvin, A. and P. Granata. (1998). Numerical study of structural joints reinforced with composite fabrics. Structures and materials, p21: (411-421), 1998.
[13] Qu, Y., Li, X., Kong, X., Zhang, W. and Wang, X. (2016). Numerical simulation on dynamic behavior of reinforced concrete beam  with intial crack subjected to air blast loading. Engineering Structures, 128, 96-110.
[14] Bozorgvar, M. and Shoushtari, A. (2011). The effects of explosion Loading on earthquake-resistant RC structures, Sixth National Congress of Civil Engineering, Semnan, Iran.
[15] Yan, B., Liu, F., Song, D. and Jiang, Z. (2015). Numerical study on damage mechanism of RC beam under close-in blast loading. Engineering Failure Analysis, 51, 9-19.
[16] Stochino, F. (2015). RC beam under blast load: Reliability and sensitivity analysis. Engineering Failure Analysis, 66, 544-565.
[17] Son, J., Astaneh-Asl, A. and Rutner, M. (2015). Performance of Bridge Decks Subjected to Blast Load. the 6th - Japanese-German - Bridge - Symposium, Munich, Germany.
[18] Iranian National Building Code (INBC). (2013). Part 8: Design and Construction of Masonry buildings. Ministry of Housing and Urban Development, Tehran, Iran.
[19] Ibrahima, Y. Ismaila, M.A. and Nabilb, M. (2017). Response of reinforced concrete frame structures under blast loading, Engineering Management Department, Prince Sultan University, Riyadh, Saudi Arabia Structural Engineering Department, Zagazig University, Zagazig, Egypt.
[20] Mohebkhaha, A., Tasnimia, A.A. and Moghadam, H.A. (2008). Nonlinear analysis of masonry-infilled steel frames with openings using discrete element method, Journal of Constructional Steel Research. 64, 1463–1472.
[21] Abaqus Analysis User's Guide, ABAQUS 6-14, ABAQUS Simulia.
[22] Yekrangnia, M. and Shahbazi, R. (2014). ABAQUS application guide with issues in Civil and Geotechnical engineering, 3rd ed. Tehran: Elm-Omran.
[23] Rahnavard, R. and Hassanipour, A. (2015). Steel Structure Analysis Using ABAQUS, Kerman: Academic Center for Education, Culture and Research, Publishing Organization of Kerman branch.
[24] Yandzio, E. Gough, M. (1999). Protection of buildings against explosions, The Steel Construction Institute.
[25] Noble, C.R. and Nuss, L.K. (2004). Implicit and Explicit Nonlinear Dynamic Analysis of a Large Thin-Arch dam using massively parallel computing. 13th World Conference on Earthquake Engineering Vancouver, B.C., Canada, Paper No. 2493.
[26] Zukas, J.A. and Scheffler, D.R. (2000). Practical aspects of numerical simulations of dynamic events: effects of meshing, Computational Mechanics Consultants, Inc., P.O. Box 11314, Baltimore, MD 21239-0314, USA.

Files

History

  • Receive Date: 15 June 2020
  • Revise Date: 06 November 2020
  • Accept Date: 19 January 2021

Share

How to cite

Statistics