冷却塔塔筒荷载效应和简化设计方法——配筋计算流程的简化
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摘要
为简化冷却塔塔筒配筋设计中的多风向计算问题,以某冷却塔为例,通过分析各荷载单独作用下的内力状态,包括各自的控制性内力、内力环向分布特征等,对各荷载尤其是风荷载的内力状态进行简化,并根据冷却塔塔筒的旋转轴对称设计原则,从而提出了一种配筋计算的简化方法。与常规方法相比,简化方法所得配筋量仅略有增加,但不仅避免了多风向的组合计算,还无需对整个环向进行配筋计算,在一个确定高度位置只需取一组内力进行配筋计算即可,大大降低了计算工作量。
Studies were initiated for a simplified design procedure for ultimate limit state of hyperbolic cooling tower(HCT)shell,which considersvarious wind directions at present.The internal forces due to each load,especially the wind load,are simplified based on the analysis of internal forces under every single load of a HCT,including their dominating internal forces and their latitude distributions.Then a simplified reinforcement calculation procedure is proposed on the basis of axisymmetrical design principle.Compared with the conventional method,this simplified one can not only avoid the combination calculation of load directions,but also avoid reinforcement calculation in the whole latitude.For a certain height,just one group of internal forces is needed for the final reinforcement calculation.So,the computational effort is greatly reduced with just slight increase of reinforcements.
Studies were initiated for a simplified design procedure for ultimate limit state of hyperbolic cooling tower(HCT)shell,which considersvarious wind directions at present.The internal forces due to each load,especially the wind load,are simplified based on the analysis of internal forces under every single load of a HCT,including their dominating internal forces and their latitude distributions.Then a simplified reinforcement calculation procedure is proposed on the basis of axisymmetrical design principle.Compared with the conventional method,this simplified one can not only avoid the combination calculation of load directions,but also avoid reinforcement calculation in the whole latitude.For a certain height,just one group of internal forces is needed for the final reinforcement calculation.So,the computational effort is greatly reduced with just slight increase of reinforcements.
引文
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[3]邱旭,荆建刚,刘爱斌,等.基于结构总体造价的大型冷却塔最不利荷载加载角度[J].中小企业管理与科技,2015(5):225-226.Qiu X,Jing J G,Liu A B,et al.The worst load directions for hyperboloidal cooling tower design based on the global cost[J].Management&Technolosy of SME,2015(5):225-226.(in Chinese)
[4]中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2010.Minstry of Housing and Urban-Rural Development of People’s Republic of China.Code for design of concrete structures:GB 50010—2010[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[5]VGB-Guideline:Structural design of cooling towertechnical guideline for the structural design,computation and execution of cooling towers(VGB-R 610Ue)[S].Essen:BTR Bautechnik bei Kühltürmen,2005.
[6]BS 4485Part 4.Code of practice for structural design and construction-water cooling towers[S].London:British Standard Institution,1996.
[7]国家发改委.火力发电厂水工设计规范:DL/T 5339—2006[S].北京:中国电力出版社,2006.National Development and Reform Commision.Code for hydraulic design of fossil fuel power plants:DL/T5339—2006[S].Beijing:China Electric Power Press,2006.(in Chinese)
[8]中华人民共和国住房和城乡建设部.构筑物抗震设计规范:GB 50191—2012[S].北京:中国计划出版,2012.Minstry of Housing and Urban-Rural Development of People’s Republic of China.Code for seismic design of special structures:GB 50191—2012[S].Beijing:China Planning Press,2002.(in Chinese)
[9]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.Code for design of cooling for industrial recirculating water:GB/T50102—2014[S].Beijing:China Planning Press,2014.(in Chinese)