侧向爆炸作用下土中钢-混凝土竖井结构破坏模式研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (14) : 64-75.

论文

孙善政，卢浩

作者信息 +

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

SUN Shanzheng，LU Hao

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文章历史 +

摘要

针对土中钢板-钢筋混凝土竖井结构受侧向爆炸作用下的破坏模式，综合采用模型实验与有限元数值仿真计算方法，分析了不同比例爆距情况下竖井结构的破坏特征以及竖井结构端部对破坏模式、破坏程度的影响，根据结构破坏特征划分了破坏等级，确定了破坏等级判据指标及与各破坏等级的对应阈值。参数化分析了竖井混凝土强度、混凝土厚径比、钢板厚径比对竖井结构破坏特征、破坏程度的影响。得到了以下结论：①随着比例爆距的减小，土中竖井结构的破坏模式分别为弹塑性动力响应、塑性铰线形成、井壁混凝土局部贯穿、井壁混凝土冲切破坏，钢板在混凝土块冲击下变形四种典型的破坏模式。②根据竖井结构变形特征，确定了衡量结构圆形横截面变形程度的无量纲环向相对位移、衡量结构侧面梁式变形的无量纲轴向相对位移作为竖井结构破坏程度的判据指标。并定量的给出了各破坏等级、的阈值范围。③混凝土强度的增加，钢板厚径比、混凝土厚径比的增大均可以增加竖井结构的抗爆性能，降低结构的破坏程度。

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.

导出引用

孙善政，卢浩. 侧向爆炸作用下土中钢-混凝土竖井结构破坏模式研究[J]. 振动与冲击, 2023, 42(14): 64-75

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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