钢外筒-FRP内筒复合材料烟囱在地震作用下的响应分析

用FRP内筒与钢外筒一起组成套筒式新型复合材料烟囱结构。然而,玻璃钢复合材料烟囱结构的分析较为罕见,目前还没有相应的设计规范,其设计和计算较为困难。结合ANSYS有限元分析软件应用振型分解反应谱法研究钢外筒-FRP内筒复合材料烟囱结构在地震作用下的动力特性和地震响应,应用Tsai-Wu强度比理论对其进行了校核,并与相同结构尺寸的钢烟囱在相同地震作用下的响应结果进行了对比分析,探讨该新型烟囱结构的优势与可行性,为其抗震设计提供可靠的参考。

SEISMIC RESPONSE ANALYSIS OF STEEL OUTER CYLINDER-FRP INNER CYLINDER COMPOSITE MATERIAL CHIMNEY

FRP composite materials,because of its corrosion resistance and other advantages,are widely used.By using glass fiber reinforced plastic inner cylinder and steel outer cylinder together,a new type of composite chimney structure was formed.However,the analysis of the FRP composite chimney structure is rare.And,our country has no corresponding specification,so its design and calculation is more difficult.In this paper,we can only refer to the design and calculation method of chimney structure such as concrete chimney or steel chimney.ANSYS finite element analysis software is applied to analyze the dynamic characteristics and seismic response of steel tube-FRP inner tube composite chimney structure under seismic action by mode decomposition response spectrum method.Strength analyses are proceeded according to Tsai-Wu failure criteria based on the laminated shell theory of composite materials.And,the results are compared with those of steel chimney of the same structure size under earthquake action.Its advantages and feasibility of the new chimney structure are discussed,which provides reliable references for the aseismic design of the new composite chimney structure.