高耸钢烟囱风振响应分析模型和方法研究  

STUDY ON MODELS AND METHODS OF HIGH-RISE STEEL CHIMNEYS UNDER WIND LOADS

作　　者：陈鑫[1] 李爱群[2] 王泳 张志强[2] 

机构地区：[1]苏州科技学院江苏省结构工程重点实验室,江苏苏州215011 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [3]苏州云自华鼎烟囱制造有限公司,江苏苏州215003

出　　处：《工业建筑》2015年第9期154-160,173,共8页Industrial Construction

基　　金：国家杰出青年基金资助项目(50725858);江苏省高校自然科学研究项目(13KJB560012);江苏省自然基金面上项目(BK2011693);混凝土及预应力混凝土结构教育部重点实验室开放课题基金(CPCSME2013-05)

摘　　要：围绕高耸钢烟囱风振响应展开分析。首先,根据高耸钢烟囱的特点,建立其连续模型和集中质量模型的动力微分方程;随后,考虑规范风谱的形式,推导互功率谱矩阵乔列斯分解的显示表达,改进谐波叠加法并进行风荷载模拟;其次,采用Adomian分解法(Adomian Decomposition Method,ADM)求解连续模型的动力特性,并与集中质量模型、有限元模型以及实测结果进行对比;最后,编制程序分别针对高耸钢烟囱顺风向和横风向风振在时域和频域进行求解,并与有限元分析结果和实际观测结果进行对比。研究表明:改进谐波叠加法能够提高高耸钢烟囱风荷载模拟的效率;采用ADM求解结构的动力特性具有一定的精度和效率;在进行高耸钢烟囱设计时,需考虑顺风向的气动阻尼,同时慎重选择横风向风振的分析方法。It was focused on analysis of wind induced vibration response of high-rise steel chimneys. Firstly, according to the structural characteristics of high-rise steel chimneys, the dynamic differential equations of the continous model and lumped mass model were established. Secondly, the expression of wind velocity spectrum in Chinese code was considered, the explicit formulation of Cholesky decomposition of cross spectral matrix ＇ s was deduced, and the harmony superposition method was modified, which was then used in a high-rise steel chimney. Thirdly, the dynamic characteristics of the continous model were calculated by Adomian decomposition method （ADM） , and the results were compared with the results obtained by lumped mass model, finit element model and field tests. Lastly, the wind induced vibration both along wind and cross wind, were analyzed in time domain and frequency domain by the coded programme, and the results were also compared with finit element model and field test. The results showed that the modified harmony superposition method could raise the efficiency of wind simulation of high-rise steel chimneys. And ADM was more accurate and efficiency in some degree compared with other methods in calculating the dynamic characteristics of high-rise steel chimneys. Also, when designing a high-rise steel chimney, the aerodynamic damping along wind should be considered, and the analysis methods for cross wind vibration should be selected carefully.

关 键 词：高耸钢烟囱 风振响应 频域分析 时域分析 ADOMIAN分解法 

分 类 号：TU311.3[建筑科学—结构工程]