摘要
文章阐述了多点激励随机振动的基本原理,使用通用有限元软件建立多层框架模型,研究了框架结构的主要振型,分析了行波效应以及振动方向对框架结构地震响应的影响。结果表明:一致激励时结构顶层的内力最大,而考虑行波效应时,底层的内力最大,因此一致激励的结果高估顶层的内力;对于不同方向的振动,结构响应功率谱出现峰值时的频率与其同方向1阶振型对应的特征频率相等。
The basic theory of random vibration under multi-support excitation is elaborated. Then the finite element model of multilayer frame structure is built in virtue of general purpose finite element software, and the main vibration modes of frame structure are studied. The influence of traveling wave effect and vibration direction on the seismic response of frame structure is also analyzed. The results show that the response of the top floor is the largest one in the case of uniform ground excitation while the response of the bottom floor is the largest one when considering traveling wave effect. So the internal force of the top floor will be overrated due to uniform ground excitation. When taking account of different vibration directions, the frequency at which the maximum response power spectral density appears equals to the eigenfrequency corresponding to the first mode in that direction.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第5期599-603,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(61179062
51174145)
高等学校博士学科点专项科研基金资助项目(20120072110024)
中央高校基本科研业务费专项资金资助项目(0230219140)
关键词
行波效应
随机地震响应
混凝土框架
振型叠加法
traveling wave effect stochastic seismic response concrete frame structure mode superposition method
