延性系数和调幅因子对等延性强度谱的影响分析  

Analysis of the influence of ductility factor and amplitude modulation coefficienton the constant-ductility strength spectra

作　　者：来庆辉 胡进军[1] 樊圆 谢礼立[1] LAI Qinghui;HU Jinjun;FAN Yuan;XIE Lili(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,哈尔滨150080 [2]同济大学土木工程学院,上海200092

出　　处：《振动与冲击》2020年第8期131-135,共5页Journal of Vibration and Shock

基　　金：中国地震局工程力学研究所基本科研业务专项(2016A01);黑龙江省博士后科研启动基金(LBH-Q15145)。

摘　　要：在目前结构抗震设计中,将调幅后的地震动记录作为地震动输入匹配规范谱的方法非常常见;为了分析延性系数和调幅因子对等延性强度谱的影响,通过计算单自由度体系动力时程弹塑性反应,分析了延性系数、调幅因子等因素对等延性屈服强度谱和等延性地震抗力谱的影响。经研究分析得出在不同延性系数、调幅因子条件下等延性屈服强度谱和等延性地震抗力谱的变化规律:当周期确定时,对地震动记录进行调幅时等延性地震抗力谱谱值变化趋势与调幅因子增减相同,而等延性屈服强度谱不变;延性系数逐渐增大时,等延性屈服强度谱和等延性地震抗力谱的谱值会逐渐减小。研究成果解释和阐明了延性系数和调幅因子对等延性强度谱的影响以及复杂的地震作用与结构动力特性之间的关系,可以为结构抗震研究和设计提供依据。In current structural seismic design,it is very common to match amplitude-modulated ground motion records with the standard spectra.To analyze the influence of ductility coefficient and amplitude modulation factor on the constant-ductility strength spectra,in this paper,the influence of ductility factor and amplitude modulation factor on the constant-ductility yield strength spectra and constant-ductility seismic resistance spectra was analyzed by calculating the dynamic time-history inelastic response of a single-degree-of-freedom system.Through research and analysis,the change regulation of constant-ductility yield strength spectra and constant-ductility seismic resistance spectra under different ductility coefficient and amplitude modulation factor conditions was obtained.When the period was determined,the constant-ductility seismic resistance spectra value increased and decreased when the amplitude of ground motion was modulated,but the constant-ductility yield strength spectra did not change;When the ductility coefficient increased gradually,the constant-ductility yield strength spectra values and constant-ductility seismic resistance spectra values decreased gradually.The results explain and illustrate the influence of ductility coefficient and amplitude modulation factor on constant-ductility intensity spectra and the relationship between complex seismic action and structural dynamic characteristics,which provide a basis for seismic research and design of structures.

关 键 词：等延性强度谱 弹塑性反应 延性系数 调幅因子 

分 类 号：P315[天文地球—地震学]