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Research Papers

Blast Responses of Bridge Girders With Consideration of Isolation Effect Induced by Car Bomb

[+] Author and Article Information
Zhijian Hu

Professor
School of Transportation,
Wuhan University of Technology,
Wuhan 430063, China
e-mail: hzj@whut.edu.cn

Yifeng Zhang, Zhen Zeng

School of Transportation,
Wuhan University of Technology,
Wuhan 430063, China

L. Z. Sun

Department of Civil and
Environmental Engineering,
University of California,
Irvine, CA 92697

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 7, 2016; final manuscript received September 12, 2016; published online February 1, 2017. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 139(2), 021003 (Feb 01, 2017) (7 pages) Paper No: MATS-16-1134; doi: 10.1115/1.4035273 History: Received May 07, 2016; Revised September 12, 2016

Car bomb attack exhibits considerable different effects on structures when compared with the bare explosive blast. In this paper, a postdisaster investigation is presented for an existing bridge under accidental car bomb blast loading. Based on the analysis of the explosive properties, the crack distribution and deformation of the blast loaded girders are studied. Numerical analysis is conducted to verify the findings by simulating the truck isolation effect with steel plate. Both field data and numerical results indicate that the isolation effect of the vehicle can significantly affect the blast loading distribution on structures. Specifically, the shock wave propagation is isolated directly under the explosive source with the delayed arriving time. Peak values of overpressure within the steel plate isolating region are diminished while the pressures are magnified outside the isolating region due to reflection and wave merging. The results can be applicable to determine the essential blast-resistant design criteria to reduce the probability of blast induced failures.

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Figures

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Fig. 1

Pressure decays for blast waves: (a) idealized overpressure curves and (b) peak pressure decrease at multiple distances

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Fig. 2

Existing Fengxingpai Bridge, Jiangxi Province, China (before accident)

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Fig. 3

Blast-destroyed truck

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Fig. 4

Collapse of exterior girder (girder 1)

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Fig. 5

Girder layout and crack distribution on bridge soffit (reproduced from field measurement)

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Fig. 6

Permanent deformation of girders 2 and 3

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Fig. 7

Numerical model with gauge arrangement

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Fig. 8

Comparison of girder deflections

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Fig. 9

Above-deck damage zones

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Fig. 10

Comparison of overpressure: (a) above-deck overpressure distribution without isolation and (b) above-deck overpressure distribution with isolation

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Fig. 11

Damage of the girders

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Fig. 12

Comparison of time history curves at typical positions: (a) at point 1, (b) at point 2, (c) at point 3, and (d) at point 4

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