Failure mode of a steel-concrete shaft structure in soil under the action of lateral explosion

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 64-75.

SUN Shanzheng，LU Hao

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Abstract

In order to study the failure mode of steel plate-reinforced concrete shaft structure subjected to lateral explosion in soil, the model test and finite element numerical simulation method were used to analyze the failure characteristics of shaft structure under different proportion of detonation distances and the influence of shaft structure end on failure mode and failure degree. According to the failure characteristics of the structure, the failure grade was divided, and the criterion index of failure grade and the corresponding threshold of each failure grade were determined. The effects of concrete strength, thickness-diameter ratio of concrete and thickness-diameter ratio of steel plate on the failure characteristics and degree of shaft structure are analyzed by parametric analysis. The following conclusions were obtained: ①With the decrease of proportional explosion distance, there are four typical failure modes of shaft structure in soil : elastic-plastic dynamic response; plastic hinge line formation; local penetration of shaft wall concrete; punching failure of shaft wall concrete and deformation of steel plate under impact of concrete block; ②According to the deformation characteristics of the shaft structure, the dimensionless circumferential relative displacement , which measures the deformation degree of the circular cross section of the structure, and the dimensionless axial relative displacement , which measures the beam deformation of the structure, were determined as the criterion indexes of the damage degree of the shaft structure, and the threshold range of each damage grade and were given quantitatively; ③The blast resistance of shaft structure increases and the damage degree decreases with the increase of concrete strength, the thickness-diameter ratio of steel plate and concrete.

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shaft structure in soil / steel plate-reinforced concrete structure / failure mode / damage level

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SUN Shanzheng，LU Hao. Failure mode of a steel-concrete shaft structure in soil under the action of lateral explosion[J]. Journal of Vibration and Shock, 2023, 42(14): 64-75

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