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劉哲鋒¹，陳  逵²
(1 長(zhǎng)沙理工大學(xué)土木與建筑學(xué)院，長(zhǎng)沙410076; 2 湖南大學(xué)土木工程學(xué)院，長(zhǎng)沙410082)

[摘要] 以12條典型地震波記錄為輸入，分析不同周期高層混合結(jié)構(gòu)的彈塑性總輸入能，并通過(guò)建立地震波能量時(shí)頻特征與結(jié)構(gòu)彈塑性總輸入能之間的聯(lián)系，了解高層混合結(jié)構(gòu)彈塑性總輸入能的變化趨勢(shì)及其成因。研究表明，結(jié)構(gòu)進(jìn)入彈塑性狀態(tài)后總輸入能的變化源于地震波能量主振頻段的改變。對(duì)于周期較小的結(jié)構(gòu)，結(jié)構(gòu)的塑性發(fā)展使總輸入能增加，而對(duì)于周期較大的結(jié)構(gòu)，周期的增大使得總輸入能變小或者不發(fā)生變化。提出了一種高層混合結(jié)構(gòu)彈塑性總輸入能的簡(jiǎn)化計(jì)算方法，計(jì)算結(jié)果偏于安全。
[關(guān)鍵詞] 地震能量；時(shí)頻特征；彈塑性；混合結(jié)構(gòu)；總輸入能

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