Dynamic Response and Failure Mode Analysis on Light-Weight Steel Columns under Blast Loads

Abstract:

The dynamic response and failure mode of light-weight steel columns under blast loads were studied in this paper by using nonlinear finite element analysis (FEA) software ANSYS/ LS-DYNA, aiming to develop the degree and modes of the excessive plastic deformation during failures of the columns under diverse parameters. The damaged columns with initial blast-induced deformation may evidently influence vertical stability of light-weight steel frame structures. During the numerical simulation, the element of three dimensional solid SOLID164 was used, and the strain rate effect on material strength was included in the material model with Plastic-Kinematic (MAT-03). The main parameters included in the analysis were boundary conditions, scaled distances of explosions, and the vertical compressive load ratios applied on tops of the columns. The results showed that the column with both two fixed ends was the most beneficial to resist blast shock wave, the horizontal displacement at the middle span of the columns were obviously decreasing as increasing of the scaled distances of the explosion, and the axial compression ratio only significantly influenced the column with a sliding end. The failure modes of the developed columns may be summarized as bending failure, direct shear failure, and bending shear combination failure.

• Periodical: Applied Mechanics and Materials (Volumes 166-169)
• Pages: 1489-1497
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.166-169.1489
• Online since: May 2012
• Authors: Shi Yan, Lei Liu, Peng Li, Zhi Qiang Xin, Bao Xin Qi
• Keywords: Blasting Loading, Dynamic Response, Failure Mode, Finite Element Method (FEM), Light Weight Steel Columns

References

[1] Steel Editorial Board (2006), Light Steel Design Manual, Beijing: China Building Industry Press.

[2] Zhongxian Li, Zhixia Liu, Hong Hao (2006), "Dynamic Response Analysis of Steel Structures under Blast Loads," Architectural Structure, 36: 97-101. (in Chinese)

[3] Xiuhua Zhang, Chunwei Zhang, Zhongdong Duan (2009), "Numerical Simulation on Impact Response and Failure Modes of Steel Frame Structural Columns Subject to Blast Loads," Journal of shengyang Jianzhu University (Natural Science version), 25 (4): 656-662. (in Chinese)

[4] Liew J Y R, Chen H (2004), "Explosion and Fire Analysis of Steel Frames Using Fiber Element Approach," Journal of Structural Engineering, ASCE, 130(7): 991-1000.

DOI: 10.1061/(asce)0733-9445(2004)130:7(991)

[5] Chen H, Liew J Y R (2005), "Explosion and fire analysis of steel frames using mixed element approach," Journal of Engineering Mechanics, ASCE, 131(6): 606-616.

DOI: 10.1061/(asce)0733-9399(2005)131:6(606)

[6] Li Q M, Meng H (2002), "Pulse Loading Shape Effects on Pressure Impulse Diagram of an Elastic-plastic, Single-degree-of-freedom Structural Model," International Journal of Mechanical Sciences, 44 (9): 1985-1998.

DOI: 10.1016/s0020-7403(02)00046-2

[7] Wu C, Hao H (2005), "Modeling of Simultaneous Ground Shock and Air Blast Pressure on Nearby Structures from Surface Explosions," International Journal of Impact Engineering, 31(6): 699-717.

DOI: 10.1016/j.ijimpeng.2004.03.002

[8] Technical Manual (TM5-1300) (1990), Structures to Resist the Effect of Accidental Explosions, Department of the Army, Navy and the Air force, Washington, DC.

[9] Gilbert F K, Kenneth J G (1985), Explosive Shock in Air, New York: Berlin Heidelberg.

[10] Bischoff P H, Perry S H (1991), "Compressive Behavior of Concrete at High-strain Rates," Materials and Structures, 24: 425-500.

DOI: 10.1007/bf02472016

[11] Krauthammer T (1994), "Workshop on Structural Concrete Slabs under Impulsive Loads," Proceedings of the 3rd International Conference on Structures under Shock and Impact, Madrid, Spain, 99-106.

[12] Xiaojiang Shang, Jiangyu Su, Huafeng Wang, et al (2008), ANSYS/LS-DYNA Methods of Dynamic Analysis and Projects, Beijing: China Water Power Press. (in Chinese)

[13] Livermore Software Technology Corporation (2006), LS-DYNA Keyword User's Manual, Livermore California: Livermore Software Technology Corporation.

[14] Shi Yan, Liang Zhang, Dan Wang (2005), "Failure Mode Analysis for RC Slab under Explosive Loads," Journal of shengyang Jianzhu University (Natural Science version), 21(3): 177-180. (in Chinese)