摘要
为研究黔东南地区侗族木结构鼓楼的动力特性和抗震性能,本研究选取凯里某鼓楼为研究对象,采用ABAQUS软件建立了鼓楼数值模型。通过模态分析,得到了结构的主要频率和振型,并考察了柱脚刚接对结构模态的影响。通过输入不同地震波对结构进行了多遇地震和罕遇地震作用下的抗震分析,得到了不同工况下各层关键节点的加速度和位移响应曲线。结果表明:鼓楼的1阶和2阶频率为0.325 Hz和0.328 Hz,振动方向为两个水平方向平动;柱脚刚接对鼓楼模型频率有显著影响,木柱放置础石上的连接方式保证了结构的柔性以及长周期特征,有利于结构在抗震过程中更好的吸收地震能量;罕遇地震下结构各层的层间位移角,其中EL-Centro波的最大层间位移角为0.010 rad,Takochi-oki波为0.025 3 rad,兰州人工波为0.028 rad,均小于规定限值0.033 rad,说明鼓楼在罕遇地震下仍具有良好的变形和抗倒塌能力;在6度罕遇地震作用下,结构关键节点的位移响应随层数的增大而增大,中高楼层柱节点的加速度峰值明显大于底部楼层,因此鼓楼上部结构为其薄弱层,在抗震加固中应重点关注。
In order to study dynamic characteristic and seismic performance of wooden drum-tower of Dong Nationality in Southeast Guizhou Province,a drum-tower in Kaili was chosen as the research object,and the numerical model of drum-tower was established by ABAQUS software.The main frequencies and modes of the structure were obtained by modal analysis,and the influence of rigid joints of column feet on the structure modes was also considered.The seismic analysis of the structure under frequent and rare earthquakes was carried out by inputting different seismic waves,and the acceleration and displacement response curves of key nodes in each floor under different working conditions were obtained.The results showed that the 1st and 2nd order frequencies of drum-tower were 0.325 Hz and 0.328 Hz,respectively.The vibration direction included two horizontal directions.The connection method of the wooden pillar placed on the foundation stone guaranteed the flexibility and long period characteristics of the structure,which was beneficial for the structure to better absorb seismic energy during the seismic process.The inter story displacement angle of each layer of the structure under rare earthquakes,in which the maximum inter story displacement angle of EL-Centro wave was 0.010 rad,the maximum inter story displacement angle of Takochi-oki wave was 0.0253 rad,and the maximum inter story displacement angle of Lanzhou artificial wave was 0.028 rad,all of which were less than the specified limit of 0.033 rad.The results indicated that drum-tower still had good deformation and collapse resistance under rare earthquakes.Under 6 degree rare earthquake,displacement response of key joint of structure increased with the increase of layers,peak acceleration of column joints of middle and high floors was significantly greater than that of bottom floors,so the upper structure of drum-tower was its weak layer,which should be paid more attention to in seismic reinforcement.
作者
周志鹏
陈波
黄勇
刘伟
ZHOU Zhi-peng;CHEN Bo;HUANG Yong;LIU Wei(College of Architecture and Urban Planning,Guizhou University,Guiyang 550025,Guizhou,P.R.China;Survey and Design Research Institute of Guizhou University,Guizhou University,Guiyang 550025,Guizhou,P.R.China)
出处
《林产工业》
北大核心
2023年第6期76-82,共7页
China Forest Products Industry
基金
国家自然科学基金面上项目(52068009)。
关键词
鼓楼
动力特性
抗震性能
模态分析
薄弱层
Drum-tower
Dynamic characteristic
Seismic performance
Modal analysis
Weak layer
