【摘要】 为研究地下防护工程中爆炸震动的抗震与隔震问题,提出了人工合成爆炸震动时程的拟合目标谱方法,阐述了拟合目标谱法的计算方法和过程。在生成非平稳加速度时程时,采用了近区和远区两种类型爆炸震动加速度的波形函数,导出了爆炸震动近区和远区的包络线函数。介绍了爆炸震动设计反应谱的构造方法,给出了修正的爆炸震动设计反应谱函数。针对一掘开式工程,采用拟合目标谱方法人工合成了感生地震动的加速度时程。算例表明,经过迭代调整后的计算反应谱可以在给定拟合精度内接近目标反应谱,合成的爆炸震动时程满足频谱设计要求,能够反映出爆炸地震动的频谱特性和强度非平稳性。更多还原

【Abstract】 To investigate the explosion seismic and vibration isolation in underground protective engineering,a method for an artificial synthesis of blast-induced ground motion by matching the target response spectra is presented.The calculation and processes of the matching target spectrum method are described.In the process of generating non-stationary acceleration time histories in the near or far field,two types of wave functions of blast ground acceleration are adopted to deduce the envelope functions.A procedure for construction of blast-induced ground motion design response spectra is introduced,and a modified function of the design response spectrum is proposed.As an illustration,an induced ground acceleration time history for a shallowly buried engineering is artificially synthesized using the matching-targetspectrum method.The example shows that,after iterative calculation,the adjusted response spectrum can be close to the target response spectrum within the given fitting accuracy,the synthetic blast-induced ground motion time history meets the spectrum design requirements and can reflect the spectral characteristics and non-stationary characteristics of blast-induced ground motion.更多还原