【摘要】 提出了一个单自由度结构系统爆炸地震随机地面振动演变响应的理论分析方法。根据爆炸地震效应的特点 ,建立了一个地面运动激励模型 ,并以TNT炸药爆炸实验测试结果为实例 ,讨论了模型中相关基本参数的确定方法及其结果。在给定结构固有频率和阻尼系数条件下 ,得到了单自由度系统的爆炸地震位移响应功率演变谱和均方根位移理论解。与在一个混凝土基座上的测试结果进行对比表明 ,得到的理论均方根位移具有较好的预测精度。更多还原

【Abstract】 A theoretical solution on nonstationary random response of SDOF system to ground motion caused by explosion seismic is proposed by means of the theory of evolutionary spectra.According to the characteristics of explosion seismic effects,an evolutionary excitation model of ground vibration is presented,and the experimental measurements from TNT explosions,as the prototype,are employed to discuss the method to determine the principle parameters in the excitation model and also to give their results.Under the conditions given,the natural frequencies and damping coefficients of the structural system,the evolutionary power spectra of displacement and the theoretical mean square root displacements are obtained when a system is subjected to random ground motions caused by explosion seismic.Comparing with the measurements from a concrete base in explosion field,the presented theoretical results show good predication ability.更多还原