摘要
强震观测是地震工程学的基础。在汶川地震中,全国的强震观测台站记录下了许多的强震记录,给强震记录分析提供了很好的数据基础。地震反应谱理论是对加速度记录特性进行深入研究分析后而取得的一个重要成果,是结构抗震分析的主要方法。然而传统反应谱理论中结构地震反应最大值仅仅是周期的函数,没有考虑持时要素对反应谱的影响。鉴于此,提出非定常反应谱的概念,它是在常规反应谱的基础之上引入时间因素,将地震动分段来研究,充分表现出反应谱的时变特性。最后以汶川地震强震记录为背景提出两种方法研究持时要素对反应谱的影响。
Strong-motion measurement is the basis of earthquake engineering. A lot of strong-motion datas were obtained by nationwide earthquake observation stations when earthquake occurred in Wenchuan, which provided a good data basis for analysis of strong earthquake records. In this paper, some spectral features of the peak acceleration are based on statistical analysis of strong motion records recorded in Wenchuan earthquake. Theory of earthquake response spectrum is the main method of seismic analysis and an important achievement based on depth research and analysis on acceleration characteristics. The max response of structure under earthquake input is only varying with period in traditional response spectrum during the whole time duration. The relationship between the maximum response and time duration can not be shown in the response spectrum of earthquake. The concept of unsteady response spectrum was proposed based on the moveable spectrum in this paper. Based on the conventional response spectrum, the time factor was taken into account in unsteady response spectrum research. Then the response spectrum could be studied based on time varying. As examples for strong motion records obtained from Wenchuan earthquake, two methods were proposed to research the effect of time duration on response spectrum.
出处
《工业建筑》
CSCD
北大核心
2013年第11期54-58,83,共6页
Industrial Construction
基金
国家自然基金资助项目(50908027)
地震工程与工程振动开放实验室资助项目(2009A10)
关键词
强震记录
反应谱
时变特性
非定常反应谱
strong motion records
response spectrum
time varying characteristic
unsteady response spectrum
