【摘要】 通过对一个三自由度弹性体系在垂直方向上分别加载多个不同主频的实测爆破地震波和理想正弦波,使用集中冲量法利用计算机编程求解出各爆破地震波激励下的竖向动力响应,并通过分析该结构体系的各动力响应幅值变化来探讨爆破地震波频率对三自由度弹性体系动力响应的具体影响。计算结果表明,结构的第一自振频率在分析结构各层质点的响应幅值中起主导地位;考虑爆破地震波是一个包含很多频率成分的复杂的振动信号,在分析实测爆破地震波频率对结构动态响应的影响时,除主频外,应同时考虑其它占有相当能量比例的优势频率的影响。更多还原

【Abstract】 The measured blasting seismic waves and the ideal sine waves of different dominant frequencies were separately loaded on the three degrees of freedom elastic system in vertical direction.The dynamic response under excitation of each blasting seismic wave in vertical direction was calculated with central impulse method.The variation of peak values of the structural dynamic responses was analyzed to discuss the specific effect of blasting seismic wave frequency on dynamic response of the system.The results show that the first natural frequency of the structure has dominant effect on peak values of dynamic response of structure.Other dominant frequencies with a larger proportion of total energy should be taken into consideration in addition to the basic main frequency.更多还原