超大型冷却塔随机风振响应分析
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摘要
冷却塔在随机风荷载激励作用下,动力响应具有小变形、弱非线性特点,固有频率在低频段密集分布,模态之间耦合效应较为明显。基于冷却塔刚体模型表面同步测压风洞试验结果,以非定常气动力作为输入荷载,考虑冷却塔多模态之间耦合效应,利用虚拟激励法和振型迭加法进行结构随机风振响应分析。定量地比较了结构风振响应中背景分量和共振分量的贡献,研究了参振模态数目、力谱交叉项和结构阻尼比等参数的作用效果,并与冷却塔气弹模型测振风洞试验结果进行了比较。
Under action of stochastic wind loading, dynamic responses of a cooling tower show small deformation and weakly nonlinear characteristics. Its natural frequencies centralize in a lower frequency band, coupling effects between various modes are obvious. With help of syrface aerodynamic pressure of a 1∶200 reduced-scale cooling tower model which was measured in TJ-3 wind tunnel, the stochastic response of a full-scale cooling tower was calculated using pseudo-excitation method and superposition method, considering the coupling effects between modes. The contributions of background components and resonant ones were quantified and the effects of different parameters, such as, modal numbers, cross terms of force spectra, damping ratio etc, were systematically studied. The numerical calculation results were in good agreement with the dynamic responses measured on the 1∶200 reduced-scale cooling tower aeroelastic model.
Under action of stochastic wind loading, dynamic responses of a cooling tower show small deformation and weakly nonlinear characteristics. Its natural frequencies centralize in a lower frequency band, coupling effects between various modes are obvious. With help of syrface aerodynamic pressure of a 1∶200 reduced-scale cooling tower model which was measured in TJ-3 wind tunnel, the stochastic response of a full-scale cooling tower was calculated using pseudo-excitation method and superposition method, considering the coupling effects between modes. The contributions of background components and resonant ones were quantified and the effects of different parameters, such as, modal numbers, cross terms of force spectra, damping ratio etc, were systematically studied. The numerical calculation results were in good agreement with the dynamic responses measured on the 1∶200 reduced-scale cooling tower aeroelastic model.
引文
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[2]赵林,葛耀君,许林汕,等.超大型冷却塔风致干扰效应研究[J].工程力学,2009,26(1):149-159.
[3]赵林,李鹏飞,葛耀君.超大型冷却塔等效静风荷载效应数值分析[J].工程力学,2008,25(7):79-86.
[4]李鹏飞,赵林,葛耀君.超大型冷却塔风荷载特性风洞试验研究[J].工程力学,2008,25(6):60-67.
[5]张相庭.工程结构风荷载理论和抗风计算手册[M].同济大学出版社,1990.
[6]Lin Zhao,Yao-Jun Ge.Aerodynamic and Aero-elastic ModelTests of the Highest Cooling Towers in China.20071CWE.
[7]赵林,葛耀君,曹丰产.双曲薄壳冷却塔气弹模型等效梁格设计方法[J].振动工程学报,2008,21(1):31-37.
[8]赵林,宋锦忠,高玲,等.冷却塔群塔刚体测压试验研究[J].实验流体力学,2007,21(2).
[9]刘天成,赵林,丁志斌.圆形截面冷却塔不同表面粗糙度时绕流特性的试验研究[J].工业建筑,2006,36(396):301-304.
[10]林家浩.随机地震响应的确定性算法[M].北京:中国建筑工业出版社,2000.
[11]林家浩,钟万勰.关于虚拟激励法与结构随机响应的注记[J].计算力学学报,1998,15:217-223.
[12]顾明,周暄毅.大跨屋盖结构风致抖振响应研究[J].土木工程学报,2006,39(11).
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