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A Study on Impulsive Fracture of Steel Plates and Members Caused by the Shaped Charge during the Blasting Demolition of Steel Buildings

钢结构建筑爆破拆除聚能装药引起钢板及构件冲击断裂的研究

基本信息

批准号：
11650586
负责人：
MATSUO Akira
金额：
$ 1.86万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650586/
关键词：
shaped charge bliasting demolitions Monroe effect Pentolite high-speed camera impulsive fracture liner-cutter H-column 鋼構造物

项目摘要

Main objectives of this research are establishment of the relation between the quantity of the shaped charge and cutting area of steel plate, and development of a cutting method of 1/3-scale H-columns.In 1999 five kinds of steel plates(SS400, SM490, SA440B, HITEN690B, HITEN780B)are selected and cut by the shaped charge, which give rise to the relation between the quantity of the shaped charge and cutting area of steel plates. During the explosive tests a high-speed camera is used and the following conclusions are derived. 1)Stationary explosive speed of the shaped charge using Pentolite is about 7000m/sec. 2)Steel plates are cut off not only by the effect of metal jet but also by the liner-cutter effect following the metal jet.In 2000 explosive tests of cutting 1/3-scale H-column are performed. Four cutting patterns are tested. They are horizontal and inclined complete cuttings and two partly-cuttings(horizontal and L-shaped)where a flange remains not to be cut. According to these tests it is concluded that the amount of shaped charge decided according to experimental results in 1999 brings successful cuttings of H-columns and that it is possible to control the collapse mode of the structures in the blasting demolitions.

本研究的主要目的是建立聚能装药数量与钢板切割面积之间的关系，并开发1/3比例H柱的切割方法。（SS 400、SM 490、SA 440 B、HITEN 690 B、HITEN 780 B）进行聚能切割，从而得出聚能装药量与钢板切割面积之间的关系。在爆炸试验期间，使用了高速摄像机，并得出以下结论。1)采用Pentolite的聚能装药稳态爆速约为7000 m/s。2)钢板的切割不仅依靠金属射流的作用，而且还依靠金属射流后产生的线性切割器效应。四个切割模式进行了测试。它们是水平的和倾斜的完整切屑和两个部分切屑（水平和L形），其中凸缘未被切割。试验结果表明，根据1999年的试验结果确定的聚能装药量能够成功地切割H柱，并能在爆破拆除中控制建筑物的倒塌方式。