脉动风载作用下锅炉钢架结构动力响应分析

以某火电厂框架式锅炉钢架结构为研究对象,对其在对脉动风载作用下的动力响应进行了分析。基于线性滤波法中的自回归模型(AR),运用Matlab模拟出给定风速功率谱的风速时程曲线,并与Davenport谱对比验证了风速曲线的合理性,再经过相关公式推导,从而获得作用在结构各节点的脉动风载时程曲线。借助有限元分析软件ANSYS,对锅炉钢架结构进行了模态分析,以及风载作用下的动力响应分析。结果表明,利用AR模型得到的风速时程具有较高的可靠度。锅炉钢架结构的水平位移随着高度的增加呈现递增趋势。研究内容为大型锅炉钢架结构脉动风载的分析提供了参考。

ANALYSIS OF STRUCTURAL DYNAMIC RESPONSE OF BOILER STEEL UNDER FLUCTUATING WIND LOAD

In this paper, the steel structure within a power plant boiler is studied by analyzing the dynamic characteristics under the fluctuating wind load. Based on autoregressive model (AR)and a given power spectrum, the curve of wind speed time series (WSTS)is simulated by Matlab software, the results of which is proved to be reasonable as compared with the Davenport spectrum curve. Curves of fluctuating wind load time series on the nodes of boiler steel structure are obtained by relevant derivation. Both modal analysis and dynamic time history response of boiler steel structure are studied by software ANSYS. The results show that the wind speed time series obtained by AR model has higher reliability, and the horizontal displacement of the structure increases with the increasing of height. The research content provides a reference of analyzing the fluctuating wind load for the large boiler steel structures.