摘要
对12个不同层数组合的轻木-混凝土上下混合结构进行有限元模拟分析,通过振动模态、非线性动力时程响应以及刚度比等的参数分析,研究了上部木结构的水平地震作用的放大效应。研究结果表明,上部木结构的水平地震作用放大效应与地震水准、下部结构与上部结构的刚度比、混凝土结构层数和木结构层数等因素有关:放大效应随地震水准的提高而增大;当下部与上部结构的刚度比在一定范围内时,放大效应随刚度比的增大而减小,当下部与上部结构的刚度比大于一定范围的上限后趋于平稳;当下部混凝土层数一定时,放大效应随上部木结构层数的增加而减小;当上部木结构层数一定时,放大效应随下部混凝土层数的增加而增大。根据研究结果,对轻木-混凝土上下混合结构提出上下分开设计、上部结构按刚度比考虑地震作用放大效应的抗震设计方法。
The finite element simulation was conducted on 12 different light wood frame-concrete hybrid structures with the emphasis on studying the horizontal seismic action amplification effect with regard to the upper wood structure. The nonlinear dynamic time-history response was calculated,and the stiffness ratio analysis was conducted. Results show that the amplification effect was related to seismic intensities,bottom to upper stiffness ratio,and the number of stories for both concrete structure and timber structure. With increased seismic intensities,the horizontal seismic action amplification factor increases. When the bottom to upper stiffness ratio is within a limit,the amplification factor decreases with the stiffness ratio increases,and the variation of the amplification factor decreases when the ratio is greater than the upper limit. With a certain configuration of the lower concrete structure,the amplification factor decreases with the increasing number of stories of the upper wood structure. With a certain configuration of the upper wood structure,the amplification factor increases with the increase of the lower concrete stories. The suggestion on the seismic design method of wood-concrete hybrid structures is given based on the analytical result. For the hybrid structures,upper wood structure and bottom concrete structure can be designed independently. The amplification factor should be considered to the upper wood structure according to the stiffness ratio.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第4期87-92,共6页
Journal of Building Structures
基金
国家自然科学基金项目(51378382)
关键词
轻木-混凝土上下混合结构
动力时程分析
刚度比
地震作用放大系数
设计方法
light wood frame-concrete hybrid structure
dynamic time-history analysis
stiffness ratio
seismic action amplification factor
design method
