Blast-Resistance Analysis of Long Span Concrete Cable-Stayed Bridges

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (23) : 209-215.

HU Zhi-jian 1, ZHANG Yi-feng 1, LIU Fang 1

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Abstract

In order to study the dynamic responses and failure modes of long span concrete cable-stayed bridges under blast loads, finite element models for the whole bridge and local segment of midspan of the stiffening girder were established to perform dynamic analysis of cables under different TNT weights and different detonation locations. The results show that stayed cables under blast loading are strong enough to resist breaking except for the case of eccentrical blast loading under which the cables close to the detonation may have high risk of break. Local damage modes for concrete girder may be greatly influenced by TNT equivalent weights and its corresponding location. As TNT equivalent weight increase,the damage mode will change from flexural failure to direct shear failure. The stiffening ribs may improve the blast-resistance for concrete girder under the small and medium-blast loading by enlarging its lateral rigidity and inhibiting the expansion of damage areas. More serious damage occurs in the box girder under the blast loads due to confinement effect on shock wave from inner chamber of the girder after its top slab being penetrated.

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long span concrete cable-stayed bridge / blast loads / local damage modes / confinement effects / stiffening ribs

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HU Zhi-jian 1, ZHANG Yi-feng 1, LIU Fang 1. Blast-Resistance Analysis of Long Span Concrete Cable-Stayed Bridges[J]. Journal of Vibration and Shock, 2016, 35(23): 209-215

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