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为对比分析5·12汶川地震和3·11东日本大地震的加速度反应谱和结构地震反应特征,挑选132条汶川地震和404条东日本大地震中Ⅱ类场地上的水平向加速度记录,进行统计分析。根据这两次大地震的标准加速度反应谱,给出了拟合谱曲线。将所得拟合谱作为需求谱,分别对6层框架结构和20层框架结构进行了Pushover分析,比较在上述两次大地震下不同框架结构地震反应的差异。结果表明:东日本大地震记录比汶川地震记录具有较明显的长周期地震动特征;两次地震记录的区别在高层框架结构的地震反应上表现得更加明显,东日本大地震记录对具有较长自振周期的结构的地震反应影响更为显著。
In order to compare and analyze the acceleration response spectrum and structural seismic response characteristics of the 5.12 Wenchuan and 3.11 East Japan Earthquakes, we selected the horizontal acceleration records of Class Ⅱ sites in 132 Wenchuan earthquakes and 404 East Japan Earthquakes and carried out Statistical Analysis. According to the standard acceleration response spectra of these two earthquakes, the fitting curve is given. Pushover analysis of the six-story frame structure and the twenty-story frame structure is carried out using the obtained fitting spectrum as the demand spectrum, and the differences of seismic responses of different frame structures under the two major earthquakes are compared. The results show that the East Japan Earthquake records more obvious characteristics of long-period earthquakes than the Wenchuan earthquake records. The difference between the two earthquakes records is more obvious in the seismic response of high-rise frame structures. For the Great East Japan Earthquake records, The seismic response of structures with natural cycles is more pronounced.