大型冷却塔结构多目标等效静风荷载分析
|
摘要
大型冷却塔属于典型的风敏感结构,针对其风振响应的多耦合效应、多振型参与和多目标等效的特点,以冷却塔表面平均风荷载和主导振型的惯性风荷载作为构造多目标等效静风荷载的2个基本向量,并结合约束最小二乘法,得到基本向量的最优组合系数,从而获得针对多个等效目标的等效静风荷载。该方法的优点是:建立了更符合实际分布的等效风荷载,限制了某些奇异荷载作用模式的出现,能够再现风振响应特点。结合某核电站大型冷却塔结构的风洞试验,对3组不同等效目标的结构响应进行了多目标等效静风荷载分析,结果表明在该方法得到的多目标等效静力风荷载作用下的风振响应与极值响应吻合较好。
Large cooling towers are the typical wind sensitive structures. According to the characteristics of multiple coupling effect of wind induced responses, multimode and multiple equivalent objectives, mean wind loads and dominating vibration modes were selected as the basic vectors to express equivalent static wind loads for multiple objectives, and a constrained least squares method was applied for calculating the optimal combination factors of these basic vectors, in order to obtain multi-objective equivalent static wind loading. The advantage of the method is that equivalent static wind loads could reduce the dimension of equivalent static wind loading vector and to exclude some unrealistic and curious load distributions, and reflect the characteristics of wind-induced response. Combined with a wind tunnel test of large cooling towers in a nuclear power plant, the multi-objective equivalent static wind loading was analyzed for three grou of different equivalent targets’ structural response. The results show that the wind induced response under multi-objective equivalent static wind loading agrees well with the peak values under the actual dynamic wind loads.
Large cooling towers are the typical wind sensitive structures. According to the characteristics of multiple coupling effect of wind induced responses, multimode and multiple equivalent objectives, mean wind loads and dominating vibration modes were selected as the basic vectors to express equivalent static wind loads for multiple objectives, and a constrained least squares method was applied for calculating the optimal combination factors of these basic vectors, in order to obtain multi-objective equivalent static wind loading. The advantage of the method is that equivalent static wind loads could reduce the dimension of equivalent static wind loading vector and to exclude some unrealistic and curious load distributions, and reflect the characteristics of wind-induced response. Combined with a wind tunnel test of large cooling towers in a nuclear power plant, the multi-objective equivalent static wind loading was analyzed for three grou of different equivalent targets’ structural response. The results show that the wind induced response under multi-objective equivalent static wind loading agrees well with the peak values under the actual dynamic wind loads.
引文
[1]柯世堂,赵林,葛耀君,等.超大型冷却塔结构风振与地震作用影响比较[J].哈尔滨工业大学学报,2010,42(10):1635-1641.
[2]陈凯,魏庆鼎.冷却塔风致振动实验研究[C]//第十一届全国结构风工程学会论文集.西安:全国结构风工程学会,2003:177-182.
[3]Kasperski M,Niemann H J.The LRC(load-response-correlation)-method a general method of estimating unfavorable wind load distributions for linear and non-linear structural behavior[J].Journal of Wind Engineering and Industrial Aerodynamics,1992,43(1-3):1753-1763.
[4]Kasumura A,Tamura Y,Nakamura O.Universalwind load distribution smi ultaneously reproducing largest load effects in all subject members on large-span cantilevered roof[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(9-11):1145-1165.
[5]梁枢果,吴海洋,郭必武,等.大跨度屋盖结构等效静力风荷载数值计算方法[J].华中科技大学学报:自然科学版,2008,36(4):110-114.
[6]陈波,杨庆山,武岳.大跨空间结构的多目标等效静风荷载分析方法[J].土木工程学报,2010,43(3):62-67.
[7]武岳,陈波,沈世钊.大跨度屋盖结构等效静风荷载研究[J].建筑科学与工程学报,2005,22(4):27-39.
[8]柯世堂,葛耀君,赵林,等.大型冷却塔结构的等效静力风荷载[J].同济大学学报,2011,39(8):1132-1137.
[9]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.
[10]Ke Shitang,Ge Yaojun,Zhao Lin.Evaluation of strength and local buckling for cooling tower with gas flue[C]//Proceedings of the International Symposium on Computational Structural Engineering.Shanghai,2009:545-551.
[11]GB/T50102—2003工业循环水冷却设计规范[S].北京:中国计划出版社,2003.
[2]陈凯,魏庆鼎.冷却塔风致振动实验研究[C]//第十一届全国结构风工程学会论文集.西安:全国结构风工程学会,2003:177-182.
[3]Kasperski M,Niemann H J.The LRC(load-response-correlation)-method a general method of estimating unfavorable wind load distributions for linear and non-linear structural behavior[J].Journal of Wind Engineering and Industrial Aerodynamics,1992,43(1-3):1753-1763.
[4]Kasumura A,Tamura Y,Nakamura O.Universalwind load distribution smi ultaneously reproducing largest load effects in all subject members on large-span cantilevered roof[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(9-11):1145-1165.
[5]梁枢果,吴海洋,郭必武,等.大跨度屋盖结构等效静力风荷载数值计算方法[J].华中科技大学学报:自然科学版,2008,36(4):110-114.
[6]陈波,杨庆山,武岳.大跨空间结构的多目标等效静风荷载分析方法[J].土木工程学报,2010,43(3):62-67.
[7]武岳,陈波,沈世钊.大跨度屋盖结构等效静风荷载研究[J].建筑科学与工程学报,2005,22(4):27-39.
[8]柯世堂,葛耀君,赵林,等.大型冷却塔结构的等效静力风荷载[J].同济大学学报,2011,39(8):1132-1137.
[9]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.
[10]Ke Shitang,Ge Yaojun,Zhao Lin.Evaluation of strength and local buckling for cooling tower with gas flue[C]//Proceedings of the International Symposium on Computational Structural Engineering.Shanghai,2009:545-551.
[11]GB/T50102—2003工业循环水冷却设计规范[S].北京:中国计划出版社,2003.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心