基于能量抗震设计地震动强度指标研究

Ground motion intensity measures for seismic design method based on energy

文章选择694条不同场地类型的地震动记录作为地震动输入,计算了弹性和弹塑性单自由度体系和6个不同自振周期的多自由度结构能量反应;提出表征地震动输入能量特征的强度指标Ie,对该指标和14个已有强度指标与结构能量反应的相关性进行了分析。结果表明:与速度有关的强度指标和结构能量反应之间具有较高的相关性;对于不同周期结构,强度指标Ie与结构能量反应之间均具有较好的相关性,可以作为较合理的地震动强度指标用于基于能量抗震设计方法。

Using 694 ground motion records with different soil conditions as ground motion input, the energy responses of elastic and inelastic single degree-of-freedom（SDOF） system and six multi-degree-of-freedom （MDOF） structures with different vibration periods are calculated. The correlation analysis is conducted on t4 existing intensity measures and the proposed measure Ie in this paper with the energy responses of the above structures. The results show that the correlation between the velocity related intensity measure and the energy responses of structures is relatively high; for the structures with different periods, the better correlation be- tween the proposed measure Ieand the energy responses is found, and this measure can be used as the ground motion intensity measure for seismic design method based on energy.