断面风压作用下冷却塔塔筒内力影响线研究
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摘要
为深入理解塔筒表面风压与塔筒内力的关系,以某大型双曲冷却塔为例,根据断面风压作用下内力影响线,分析了塔筒的受力特征,尤其是其子午向受力特征和断面风压的局部效应。从子午向轴力F_Y的影响面可知:在高度方向上,F_Y受到整个塔筒高度范围荷载的影响,表现出较为明显的空间结构受力特征;但在断面风压作用下,F_Y将只受其上部荷载的影响,表现出类似悬臂结构的受力特征。另外,不管是单位面荷载还是断面风压,其他内力如子午向弯矩M_Y、环向轴力F_X和环向弯矩M_X都表现出显著的局部效应。
Studies are conducted for further interpretation of the relationship between wind loads and wind-induced internal forces in hyperbolic cooling tower shell, and the main approaches are the influence surfaces under unit pressure and influence lines under section wind pressure. It is found that the influence surface of F_Y shows striking spatial effects and F_Y at any location is influenced by the pressure all along the shell height. However, F_Y would be influenced by the section wind pressure just above it, just like a cantilever beam. Moreover, other internal forces, the latitude axial force F_X, latitude moment M_X and meridian moment M_Y, all show striking local effect both for unit single pressure and section wind pressure.
Studies are conducted for further interpretation of the relationship between wind loads and wind-induced internal forces in hyperbolic cooling tower shell, and the main approaches are the influence surfaces under unit pressure and influence lines under section wind pressure. It is found that the influence surface of F_Y shows striking spatial effects and F_Y at any location is influenced by the pressure all along the shell height. However, F_Y would be influenced by the section wind pressure just above it, just like a cantilever beam. Moreover, other internal forces, the latitude axial force F_X, latitude moment M_X and meridian moment M_Y, all show striking local effect both for unit single pressure and section wind pressure.
引文
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[3]GOULD P L.The influence of R&D on the design,construction and damage assessment of large cooling towers[C]//Proceedings of 6th International Symposium on Cooling Towers.Cologne,German:[s.n.],2012.
[4]武际可.大型冷却塔结构分析的回顾与展望[J].力学与实践,1996,18(6):1-5.(WU Jike.Review and prospect about structural analysis of cooling towers[J].Mechanics in engineering,1996,18(6):1-5(in Chinese)).
[5]黄志龙.大型冷却塔结构分析的若干问题[J].力学与实践,2012,34(5):1-5.(HUANG Zhilong.Some problems on structural analysis of cooling towers[J].Mechanics in engineering,2012,34(5):1-5(in Chinese)).
[6]赵林,刘晓鹏,高玲,等.大型冷却塔表面脉动风压原型实测与分布准则[J].土木工程学报,2017,50(1):1-11.(ZHAO Lin,LIU Xiaopeng,GAO Ling,et al.Full-scale measurement and distribution rules of surface fluctuating wind pressure of a large cooling tower[J].China civil engineering journal,2017,50(1):1-11(in Chinese)).
[7]朱鹏,柯世堂.大型双曲冷却塔支柱结构选型研究[J].应用力学学报,2016,33(1):116-122.(ZHU Peng,KE Shitang.Study on the pillars model selection of large hyperbolic cooling tower[J].Chinese journal of applied mechanics,2016,33(1):116-122(in Chinese)).
[8]张军锋,田家安,辛思远,等.冷却塔塔筒内力影响面与风荷载效应分析[J].结构工程师,2018,34(2):95-99.(ZHANG Junfeng,TIAN Jia’an,XIN Siyuan,et al.Influence surface of internal forces and wind effects of hyperbolic cooling tower shell[J].Structural engineers,2018,34(2):95-99(in Chinese)).
[9]ZHANG Junfeng,GE Yaojun,ZHAO Lin.Influence of latitude wind pressure distribution on the responses of hyperboloidal cooling tower shell[J].Wind and structures,2013,16(6):579-601.
[10]中华人民共和国住房和城乡建设部.工业循环水冷却设计规范:GB/T50102-2014[S].北京:中国计划出版社,2014.(Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Code for design of cooling for industrial recirculating water:GB/T50102-2014[S].Beijing:China Planning Press,2014(in Chinese)).