摘要
通过Rayleigh法对高耸烟囱结构进行振动分析,采用ANSYS建立高耸烟囱有限元模型,分析混凝土烟囱在水平和竖向地震共同作用下的地震响应。研究表明:将烟囱等分布柔性参数体系的运动近似为单自由度建立运动方程,采用Rayleigh法并假设结构形状函数对分布柔度体系计算自振频率是合理的;不同的结构高度、筒径尺寸对结构水平和竖向振动动力特性影响显著,结构竖向振动周期短,接近高频振动,与结构的高度呈线性变化;随着结构高度的增加,结构顶点位移呈逐渐增加趋势,结构达到位移幅值时,烟囱根部等效应力随着结构高度的增加显著增大。
Through Rayleigh method,the vibration analysis of stack-like structure was conducted.ANSYS was used to establish the finite element model of high chimney,the earthquake response of concrete chimney was studied under the combined effect of the horizontal and vertical earthquake.The results indicate that approximating the movement of chimney and other distributed flexible parameter system as a single degree of freedom to establish a motion equation,adopting Rayleigh method and assuming the structural shape function to calculate the natural frequency is reasonable.Different structure height and cylinder diameter have a significant impact on the dynamic characteristics of the horizontal and vertical vibration.Structural vertical cycle is short and close to the high-frequency vibration; it changes with height of the structure linearly.With the increase of the height of structure,vertex displacement increases gradually.When the displacement reaches the displacement amplitude,equivalent stress increases significantly.
出处
《建筑结构》
CSCD
北大核心
2013年第S2期399-405,共7页
Building Structure
