Wind-induced responses of super-large cooling towers

Abstract

Traditional gust load factor (GLF) method, inertial wind load (IWL) method and tri-component method (LRC+IWL) cannot accurately analyze the wind-induced responses of super-large cooling towers, so the real combination formulas of fluctuating wind-induced responses and equivalent static wind loads (ESWLSs) were derived based on structural dynamics and random vibration theory. The consistent coupled method (CCM) was presented to compensate the coupled term between background and resonant response. Taking the super-large cooling tower (H=215 m) of nuclear power plant in Jiangxi Province, China, which is the highest and largest in China, as the example, based on modified equivalent beam-net design method, the aero-elastic model for simultaneous pressure and vibration measurement of super-large cooling tower is firstly carried out. Then, combining wind tunnel test and CCM, the effects of self-excited force on the surface pressures and wind-induced responses are discussed, and the wind-induced response characteristics of background component, resonant component, coupled term between background and resonant response, fluctuating responses, and wind vibration coefficients are discussed. It can be concluded that wind-induced response mechanism must be understood to direct the wind resistant design for super-large cooling towers.

Keywords

super-large cooling towers / wind-induced responses / wind vibration coefficients / aero-elastic model / consistent coupled method

References

[1] NiemannH J, KopperH D. Influence of adjacent buildings on wind effects on cooling towers [J]. Engineering Structure, 1998, 20(10): 874-880

[2] Maurizio Orlando.. Wind-induced interference effects on two adjacent cooling towers [J]. Engineering Structure, 2001, 23: 979-992

[3] BuschD, HarteR, KratzigW B, MontagU. New natural draught cooling tower of 200 m height [J]. Engineering Structures, 2002, 24(12): 1509-1521

[4] DavenportA G. Gust loading factors [J]. Journal of the Structural Division, 1967, 93(3): 11-34

[5] ZhangX T. Evaluation and prospect for wind loading codes at home and abroad [J]. Journal of Tongji University, 2002, 30(5): 539-543

[6] GB50009-2012, Load code for the design of building structures [S]. The Ministry of Construction of the People’s Republic of China, 2012. Beijing. (in Chinese)

[7] BartoliG, BorriC, HoefferR, OrlandoM. Wind induced pressures and interference effects on a group of cooling towers in a power plant arrangement [C]. Proceedings of 2nd European and African Conference on Wind Engineering. Genoa, Italy, Padua, SGE, 1997969-976

[8] NohS Y, KratzigW B, MeskourisK. Numerical simulation of serviceability, damage evolution and failure of reinforced concrete shells [J]. Computers and Structures, 2003, 81(8/9/10/11): 843-857

[9] KeS T, ZhaoL, GeY J. Wind tunnel test on aeroelastic model of large hyperbolic cooling towers and features of wind-induced response [J]. Journal of Building Structure, 2010, 31(2): 61-68

[10] HolmesJ D. Equivalent static load distributions for resonant dynamic response of bridges [C]. Proc 10th Int Conf on Wind Engrg. Copenhagen, 1999907-911

[11] HolmesJ D, Kasperski. Effective distributions of fluctuating and dynamic wind loads [J]. Australian Civ/Struct Engrg Trans, 1996, 38: 83-88

[12] IrwinP A. The role of wind tunnel modeling in the prediction of wind effects on bridges [C]. Bridge aerodynamics, Balkema, Rotterdam, The Netherlands, 199859-85

[13] ZhouY, KareemA, GuM. Equivalent static buffeting laods on structures [J]. Journal of Structures Engineering, ASCE, 2000, 126(8): 989-992

[14] HarteR, WittekU. Recent developments of cooling tower design [C]. Proc of IASS Symposium 2009. Valencia, Spain, 2009198-210

[15] KeS T, GeY J, ZhaoL, TamuraY. A new methodology for analysis of equivalent static wind loads on super-large cooling towers [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2012, 111(3): 30-39

[16] GoudarzM A, Sabbagh-yazdiS R. Modeling wind ribs effects for numerical simulation external pressure load on a cooling tower of KAZERUN power plant-IRAN [J]. Wind and Structures, An International Journal, 2008, 11(6): 479-496

[17] GoodarziM. A proposed stack configuration for dry cooling tower to improve cooling efficiency under crosswind [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(12): 858-863

[18] ZhaoL, GeY J. Equivalent beam-net design method of aero-elastic model about hyperbolic thin-shell cooling towers [J]. Journal of Vibration Engineering, 2008, 21(1): 31-37

[19] KeS TWind effects and equivalent static wind loads of large cooling towers [D], 2011

[20] DL/T 5339-2006, Code for hydraulic design of fossil fuel power plants [S]. Standard National Development and Reform Commission, P.R.C. 2006. (in Chinese)