摘要
采用SAP2000建立了首都机场新塔台的三维有限元模型。在导出其刚度矩阵和质量矩阵的基础上,建立了具有三维有限元模型力学性能的二维多自由度体系。计算表明二维多自由度体系与三维有限元模型的前五阶自振周期(x方向)误差均在4.6%以内。采用快速傅利叶变换(FFT)进行了随机风场的仿真,仿真得到了16维脉动风荷载时程样本。用Wilson-θ法对其进行了动力响应分析。时程分析表明,塔台明室加速度响应峰值小于规范规定的容许峰值,满足人体舒适度要求。
The 3-dimensional finite element(3DFE) model of new tower at the Capital Airport is established with SAP2000.On the base of the stiffness matrix and the quantity matrix,the 2-dimensional multi-degree of freedom system is established, which has the same mechanics function as the 3DFE model.Calculation shows that the differences of the first 5 modes between the 2-dimensional multi-degree of freedom system and the 3DFE model are less than 4 6%.The 16-dimensional random process is got from using FFT to simulate the stochastic wind field.The dynamic response analysis is performed with Wilson-θ method.The time-history analysis shows,the peak acceleration value of the tower under wind-induced response is less than the allowable peak value and satisfies the body comfortable degree.
出处
《建筑结构》
CSCD
北大核心
2005年第6期72-74,共3页
Building Structure
基金
江苏省建设厅科技项目(JS200321)
江苏省教育厅高校科研项目(03KJD560078)
关键词
首都机场
新塔台
风振响应
整体阻尼比
力学性能
建筑结构
tall and slender structure
wind-induced response
integral damping ratio
time domain analysis
