摘要
对层间隔震结构的减震性能进行了研究。基于Timoshenko理论建立层间隔震连续化分析模型,建立层间隔震结构的动力方程,推导连续模型振型正交条件及层间隔震结构组合阻尼计算公式。随隔震层位置及刚度改变,结构各阶质量参与系数发生变化。随隔震层位置升高及刚度降低,一阶振型质量参与系数逐渐降低,高阶振型质量参与系数逐渐增大。采用虚拟激励法进行结构响应计算,以结构基底剪力均方值最小为优化目标进行参数分析,研究层间隔震结构减震效果随隔震层位置、隔震层刚度、阻尼变化的影响规律。分析表明,存在最优周期比使得基底剪力达到最小,最优参数与隔震层位置密切相关;隔震层阻尼可有效降低结构响应谱峰值,阻尼越大,结构减震效果越好。最后,采用十层框架结构进行仿真分析,以非隔震结构为参照,对比分析了基础隔震结构、中间层隔震结构的减震效果。
Aseismic properties of inter-story isolation system were studied in this paper.According to the deforma- tion characteristics of high-rise building,the equivalent continuous model was proposed based on Timoshenko theory.The dynamic properties of continuous structure subjected to random loads were studied.First,the dynamic equations and their solution methods were established.Then,modal orthogonality condition and the calculating formulas of dynamic response were proposed.The variation regularity of seismic performance was preliminarily discussed with the change of isolation layer stiffness and damping,and structural optimization of was made with low base shear variance as objective function.Research indicated that distribution of modal mass participation coefficient was adjusted by the location of isolation layer.The growth of location caused the increase of high modes participation.Research showed that the optimal period ratio parameter made the base shear variance reach the lowest point.The optimal parameters were closely related to the location of isolation layer.The isolation layer damping could reduce peak of structural response spectrum,the greater the damping,the better isolation effect.Finally,the ten story frame structure was simulated and analyzed,and the seismic performance of the base isolation structure and the middle layer isolation structure were compared and analyzed.The results of time history analysis were basically consistent with the results of spectral analysis.The analysis results can serve as a guidance of preliminary design of inter-story isolation system.
作者
宋晓
谭平
周福霖
滕晓飞
SONG Xiao;TAN Ping;ZHOU Fulin;TENG Xiaofei(Earthquake Engineering Research &Test Center,Guangzhou University,Guangzhou 510405,China;College of Civil Engineering and Arehiteeture,Henan University,Kaifeng 475001,China))
出处
《地震工程与工程振动》
CSCD
北大核心
2018年第5期41-49,共9页
Earthquake Engineering and Engineering Dynamics
基金
长江学者和创新团队发展计划项目(IRT13057)
国家自然科学基金项目(51478129)~~
