【摘要】 本文通过HHT变换得到瞬时能量谱,并以HHT对地震动作用下的结构位移响应进行分析,发现长周期结构动力响应的显著特点:最大结构位移响应总是滞后于地震动激励的最大能量谱值时间。滞后的时间主要取决于结构的动力特性参数(特别是自振周期),也与地震动的类型有关。仿真计算的结果表明:长周期结构的破环与倒塌并不发生在地震动强度最大的时刻,而多数是在地震动末期,甚至在地震动完全消失之后。有益的结论为结构控制设计与安全提供科学依据。更多还原

【Abstract】 Instantaneous energy spectrum is obtained by the HHT transform to analyze structure’s displacement responses.Notable characteristics of long-period structure are found: The instant of maximal displacement response of structure is later than the instant of maximal peak value of earthquake energy.Structural dynamic characteristic parameters(especially free vibrafion frequency) and earthquake style play an important role in determining the energy peak value appearing instant.The simulation results also indicate that the destruction or collapse of long period structure does not happen at the appearing instant of the greatest intensity of earthquake ground motion,but frequently at the final stage of earthquake ground motion,or even after the earthquake ground motion completely ends,which can provide scientific basis for the structure design and safety.更多还原