组合脉冲激励对结构的作用效应

对地震作用下结构破坏的特征及强震记录进行分析,指出对脉冲型地震动中主震脉冲的作用效应进行研究的必要性;利用三角脉冲作为强震主脉冲的理论简化,给出双三角脉冲作用下单自由度弹性体系的动力反应解析解;采用研究反应谱变化规律的方法,分析两类脉冲组合即:波前脉冲组合以及波后脉冲组合,总结归纳出波前脉冲与波后脉冲对主脉冲作用效应的不同贡献规律,为进一步研究揭示脉冲型地震动中主脉冲的破坏能力奠定了基础.

Excitation effects of pulse-combination on structures

Based on the analyses for strong ground motion records and the damage characteristics of structures under earthquakes,this paper shows the study on damage effects of the major pulse in typical pulse-type ground motions.Using the triangle pulse as the substitute of the major motion pulse,the dynamic analytical resolution of the elastic SDOF system under bi-triangle pulse excitations is presented.By studying the changing rule of the response spectrum for two types of the pulse combination,i.e.,the major pulse related predecessor and successor pulse combinations,it was found that the contribution of the predecessor and successor pulse to the major pulse effects was quite different for structural system.It provides a good understanding of the damage potential of the major pulse in strong ground motions.