Equivalent static load dynamical coefficient for exponential air blast loading with transition

GENG Shaobo; LI Hong; GE Peijie

doi:10.11883/bzycj-2018-0048

Volume 39 Issue 3

Mar. 2019

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GENG Shaobo, LI Hong, GE Peijie. Equivalent static load dynamical coefficient for exponential air blast loading with transition[J]. Explosion And Shock Waves, 2019, 39(3): 032201. doi: 10.11883/bzycj-2018-0048

Citation:

GENG Shaobo, LI Hong, GE Peijie. Equivalent static load dynamical coefficient for exponential air blast loading with transition[J]. Explosion And Shock Waves, 2019, 39(3): 032201. doi: 10.11883/bzycj-2018-0048

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Equivalent static load dynamical coefficient for exponential air blast loading with transition

doi: 10.11883/bzycj-2018-0048

GENG Shaobo^{1, 2
,},
LI Hong¹,
GE Peijie³

1.
Department of Civil Engineering, North University of China, Taiyuan, 030051,Shanxi, China
2.
Bridge Structure Safety Technology National Engineering Laboratory, Chang′an University, Xi’an, 710064, Shaanxi, China
3.
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China

Received Date: 2018-02-02
Rev Recd Date: 2018-05-12

Available Online: 2019-03-25

Publish Date: 2019-03-01

Abstract

Abstract

Compared to linear attenuation load calculation model, exponential attenuation load with transition expression was given to build equivalent SDOF differential equations under air blast loading. The expressions, which had relationship to transition duration, overpressure peak, exponential load adjusting parameter, natural frequency and overpressure duration, were derived to solve equivalent static load dynamical coefficients. Changed with transition duration and load adjusting parameters, four typical calculation conditions results were calculated. The results show that the linear attenuation blast load’s application range is limited. When the ductility ratio β＜3.0, the dynamical coefficients from the linear attenuation blast load behaves greater value and safer characteristic. When the ductility ratio β≥3.0 and wt₊＞1.4δ, it will be lower 17.4% than the value from exponential attenuation load with transition. For the much transition duration ratio, dynamical coefficients will be greater. In the range of 1%−2% for the transition duration ratio, the effect on dynamical coefficients is greater at 0.4−0.7% and can be ignored. Exponential load adjusting parameter has no effect on structural design with great flexibility while it would lead to increase or decrease the dynamical coefficients for the structure with the general flexibility.
- anti-blast design,
- Equivalent static load,
- dynamical coefficient,
- transition load,
- exponential loading

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References(20)

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