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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。
The vibration analysis of the towering chimney by Rayleigh method was carried out. The finite element model of tall chimney was established by ANSYS, and the seismic response of the concrete chimney under horizontal and vertical earthquakes was analyzed. The results show that it is reasonable to calculate the natural frequency of distributed flexibility system by using the Rayleigh method and assuming that the structure shape function is based on the approximation of the movement of the flexible parameter system with equal distribution of chimneys as a single degree of freedom. Different structural heights, Which has a significant influence on the horizontal and vertical dynamic characteristics of the structure. The vertical vibration period of the structure is short and close to the high-frequency vibration, which changes linearly with the height of the structure. As the height of the structure increases, the displacement of the structure increases gradually and the structure reaches the displacement Amplitude, the chimney root equivalent stress increases significantly with the height of the structure.