Dynamic Load Analysis of Underground Structure Under the Effect of Blast Wave
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摘要: 提出了一种求解任意形地下结构物在爆炸冲击波作用下的动应力集中问题的半解析方法.爆炸冲击波以平面SH波的形式入射,并用Fourier变换方法将其转换到频域,不同形状地下结构物的导纳函数由复变函数和保角映射的方法求得.利用Fourier逆变换,进一步合成得到时域中的地下结构的动力响应,最后,对正方形、三角形及马蹄形孔洞附近的动应力集中系数作了数值计算,并给出了具体结果.Abstract: A semi-analytical method of solving the problem of dynamic stress concentration of arbitrary underground structure under the effect of blast waves was introduced. Using the Fourier Transform theory, the shock waves (in the forms of SH-waves) can be converted into frequency bands. After employing complex functions and conformal mapping, the admittance functions of various underground structures were obtained. Then, the problem of the time domain dynamic stress response of underground structure can be easily solved through the Fourier inverse transform. At last, the results and curves of the dynamic stress for the square, triangle and horseshoe cavity are presented.
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Key words:
- dynamic stress /
- blast wave /
- FFT transform /
- underground structure
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