小型汽车撞击后框架柱剩余承载力的数值研究

Numerical investigation on residual bearing capacity of columns after collision of light weight vehicle

  • 摘要: 建筑结构局部构件遭受撞击后的承载力损失可能引发整体结构系统的连续倒塌。为分析小型车辆撞击下多层框架柱轴向剩余承载力的影响因素,该文按照轴压承载力相等的原则,设计了3类柱:钢筋混凝土(RC)方柱、方钢管混凝土(CFST)柱和方钢(ST)柱,并基于非线性有限元软件对4种因素(车速、撞击角度、轴压比和柱类型)的影响进行了参数分析。分析结果表明:速度越大,柱损伤越大,柱剩余承载力越低;柱在斜向45°撞击时比0°正撞下剩余承载力更大;轴压比对剩余承载力的影响取决于柱截面类型;RC柱的剩余承载力最大,CFST柱和ST柱剩余承载力较大且差异不明显。

     

    Abstract: When components in a building structure are subjected to a vehicle collision, they may partly lose the bearing capacity, which may trigger progressive collapse of the entire structure. In order to clarify the factors affecting the residual bearing capacity of framed columns subjected to the collision of a light weight vehicle, numerical investigation is conducted in this paper. Three kinds of square columns, i. e, reinforced concrete (RC) columns and concrete filled steel tubular (CFST) columns and steel tubular (ST) columns, are designed, of which the nominal axial bearing capacities are equal. The effects of four factors, i.e., the vehicle velocity, impact direction, axial compression ratio and types of the columns, on the residual axial bearing capacity are analyzed. The results show that the residual axial bearing capacity becomes lower as the impact velocity increases. The residual axial bearing capacity under the impact along the direction of diagonal 45 degree is higher than that under front impact. The effects of the compression ratio on the residual bearing capacity depend on the types of columns. Under the same conditions, RC columns are the most vulnerable to the vehicle collision. The difference in residual capacity between CFST and ST columns is small under the impact of light weight vehicle.

     

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