摘要
建立具有设计意义的地震动总输入能量谱是实现结构能量设计的基础。根据中长周期段修正的加速度反应谱及地震动有效持时,提出了一种生成地震动输入能量谱的方法。统计270组人工波的时程分析结果,得到了以等效速度表征的四段式弹性单自由度(single degree of freedom,SDOF)体系总输入能量谱,并给出了不同场地类型、抗震设防烈度等设计条件下归一化等效速度谱的参数取值。在考虑延性系数及刚度折减系数的影响后,提出了弹塑性SDOF体系修正输入能量谱的等效速度谱,估算了引起结构损伤的滞回耗能占总能量的比值。该能量谱可为基于能量的结构设计及研究提供参考。
Establishing a seismic total input energy spectrum with design significance is the foundation to realize structural energy design.Here,according to the modified acceleration response spectrum for medium-long period stage and effective duration of seismic motion,a method to generate seismic input energy spectrum was proposed.The time history analysis results of 270 sets of artificial waves were statistically analyzed,and the total input energy spectrum of a 4-segment elastic single degree of freedom(SDOF)system characterized by equivalent velocity was obtained.Parameter values for normalized equivalent velocity spectrum were given under design conditions of different site types and aseismic fortification intensities.After considering effects of ductility coefficient and stiffness reduction coefficient,the equivalent velocity spectrum for modified input energy spectrum of elastic-plastic SDOF system was proposed,and the ratio of hysteretic energy dissipation causing structural damage to the total energy was estimated.It was shown that the proposed energy spectrum can provide a reference for energy-based structural design and study.
作者
郑彦君
王湛
刘德铭
潘建荣
胡方鑫
ZHENG Yanjun;WANG Zhan;LIU Deming;PAN Jianrong;HU Fangxin(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510641,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第21期21-30,45,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(51978279,52278181)
广东省基础与应用基础研究基金(2023A1515011181,2023A1515010047,2021B1212040003,2023B1515040012)
亚热带建筑与城市科学全国重点实验室(2022KA04,2022KB15)。
关键词
归一化等效速度谱
弹塑性单自由度(SDOF)体系
地震动持时
滞回耗能占比
normalized equivalent velocity spectrum
elastic-plastic single degree of freedom(SDOF)system
seismic duration
hysteretic energy dissipation ratio
