刘哲锋¹，陈  逵²
(1 长沙理工大学土木与建筑学院，长沙410076; 2 湖南大学土木工程学院，长沙410082)

[摘要] 以12条典型地震波记录为输入，分析不同周期高层混合结构的弹塑性总输入能，并通过建立地震波能量时频特征与结构弹塑性总输入能之间的联系，了解高层混合结构弹塑性总输入能的变化趋势及其成因。研究表明，结构进入弹塑性状态后总输入能的变化源于地震波能量主振频段的改变。对于周期较小的结构，结构的塑性发展使总输入能增加，而对于周期较大的结构，周期的增大使得总输入能变小或者不发生变化。提出了一种高层混合结构弹塑性总输入能的简化计算方法，计算结果偏于安全。
[关键词] 地震能量；时频特征；弹塑性；混合结构；总输入能

Research ofinput energy in elastoplastic tall hybrid structures based on time-frequency energy characteristic of seismic waves
Liu Zhefeng¹, Chen Kui ²
(1 School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410076, China; 2 College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract: Based on analysis of input energy for elastoplastic tall hybrid structures with various periods subjected to 12 typical earthquake records, the relations between input energy and time-frequency energy characteristic of ground motions are investigated to understand the change trends of input energy. The results indicate that the change of input energy originates from the change of main vibration frequency of seismic waves. The input energy increases for plastic structures with short period but decreases or remains invariant for plastic structures with long period. The authors present a simplified method for the calculation of input energy for elastoplastic tall hybrid buildings, and the calculated results are conservative.
Keywords: seismic energy; time-frequency characteristics; elastoplastic; hybrid structure; input energy