钢框架结构在坠落块体撞击作用下的动力效应分析

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 8-15.

论文

乔惠云1,2，罗才松1,2，马永超1,2，陈誉3

作者信息 +

Dynamic effect analysis of steel frame structure under impact of falling block

QIAO Huiyun1,2, LUO Caisong1,2, MA Yongchao1,2, CHEN Yu3

Author information +

文章历史 +

摘要

局部构件失效导致钢框架结构的传力路径发生变化，除了影响正上方结构的受力性能，还可能使下层结构受到局部块体掉落冲击影响。下层结构能够抵抗撞击荷载，是框架结构抵抗连续倒塌的重要研究内容。下层框架梁碰撞的动力特性对研究其抗倒塌能力至关重要，其中最大位移和撞击力变化是关键的动力特性。首先考虑完全塑性撞击和完全刚性撞击两种极端情况，依据动量守恒和能量守恒，并结合框架梁的变形能函数，确定梁在块体撞击后最大位移的上限值和下限值，然后采用已有落锤撞击试验验证最大位移理论分析的准确性。研究表明：坠块速度较小时，碰撞接近于完全刚性撞击，速度较大时，碰撞接近于完全塑性撞击。坠块撞击点接近于跨中时，理论模型与有限元模型接近，撞击点位于约束端时，完全刚性理论计算值比模拟值偏大。

Abstract

The local components failure may change the force transfer path of the steel frame structure. In addition to affecting the mechanical performance of the structure directly above the failure components, the lower structure may also be affected by local block drop impact. The lower structure is able to resist the impact load, which is an important research on progressive collapse resistance of frame structure. The dynamic characteristics of the lower frame beam under impact are very important to study its collapse resistance, among which the maximum displacement and impact force are the key dynamic characteristics. First of all, the two extreme cases of complete plastic impact and complete rigid impact are considered. According to the momentum conservation and energy conservation, and combined with the deformation energy function of beam, the upper and lower limit values of the maximum displacement of the beam after the block impact are determined. Then, the accuracy of the maximum displacement theoretical analysis is verified by an impact test of the drop hammer. The results show that when the velocity of the drop block is low, the collision is close to the completely rigid impact, and when the velocity is high, the collision is close to the completely plastic impact. The impact point of the drop block is close to the middle of the span, and the theoretical model is close to the finite element model. When the impact point is located at the constraint end, the calculated value of complete rigidity is larger than the simulated value.

导出引用

乔惠云1,2，罗才松1,2，马永超1,2，陈誉3. 钢框架结构在坠落块体撞击作用下的动力效应分析[J]. 振动与冲击, 2021, 40(5): 8-15

QIAO Huiyun1,2, LUO Caisong1,2, MA Yongchao1,2, CHEN Yu3. Dynamic effect analysis of steel frame structure under impact of falling block[J]. Journal of Vibration and Shock, 2021, 40(5): 8-15

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