عنوان مقاله [English]
Tall industrial chimneys are sensitive structures to dynamic wind loads. Design codes generally provide approximate equations to estimate the wind-induced response of tall structures. However, they require dynamic analysis to determine the accurate response of slender and sensitive structures. In the present study, dynamic responses of 100-400 m tall RC chimneys under the random wind loads are determined using the frequency domain analysis. Due to the dominant bending mode, the structure of the chimney is modeled as a multi-degree-of-freedom (MDOF) lumped-mass system. All the modeling and analysis procedure, including element meshing, determining the transfer matrix, calculating the along-wind and across-wind force spectrum matrices, and the numerical integration to obtain the responses, are carried out using MATLAB software. The effect of different design parameters, such as chimney height, top diameter to base diameter ratio, basic wind velocity, and terrain category on the wind-induced response of structures, is investigated. The results indicate that the coefficient of variation (CV) of the along-wind response increases with increasing the basic wind velocity. The maximum across-wind responses of the studied chimneys occur in the basic wind velocity range of 10 to 20 m/sec. The across-wind response significantly decreases as the ratio of top diameter to base diameter of the chimney decreases.
 Davenport A.G. (1967), “Gust loading factors”; Journal of the Structural Division, ASCE, 93, 11-34
 Vickery B.J, (1970) ;“On the reliability of gust loading factors”; Proc., Technical Meeting Concerning Wind Loads on Buildings and Structure, 30 , 296–312.
 Solari, G. (1993a), “Gust buffeting. I: Peak wind velocity and equivalent pressure”; Journal of Structural Engineering, 119(2) , 365–382.
 Solari G. (1993b), ‘‘Gust buffeting. II: Dynamic along-wind response’’; Journal of Structural Engineering, 119(2), 383–397.
 Menon D. and Rao S. (1997), “Estimation of along-wind moments in RC chimneys”, Engineering Structures, 19(1), 71 78.
 Kijewski T., and Kareem A. (1998), “Dynamic wind effects: A comparative study of provisions in codes and standards with wind tunnel data”; Wind and Structures An International Journal, 1(1) 77–109.
 Zhou Y., Kijewski T., and Kareem A. (2002), “Along-wind load effects on tall buildings: Comparative study of major international codes and standards”; Journal of Structural Engineering, ASCE , 128, 788–96.
 Kwon D.K. and Kareem A. (2013), “Comparative study of major international wind codes and standards for wind effects on tall buildings”; Engineering Structures, 51 23–35
 Vickery B.J. and Clarke A.W. (1972), "Lift or across-wind response of tapered stacks"; Journal of the Structural Division, 98, 1-20.
 Vickery B.J. and Basu R.J. (1983), “Across-wind vibrations of structures of circular cross-section. part I. development of a mathematical model for two-dimensional conditions”; Journal of Wind Engineering and Industrial Aerodynamics, 12, 49-73
 Vickery B.J. and Basu R.I. (1984), “The response of reinforced concrete structures to vortex shedding”; Journal of Structural Engineering, 6, 324-333.
 Menon D. and Rao S. (1997), “Uncertainties in codal recommendations for across-wind load analysis of R/C chimneys”; Journal of Wind Engineering and Industrial Aerodynamics, 72, 455-468
 Arunachalam,S. (2014) , “A method for prediction of across-wind response of tall circular concrete chimneys.”; J.Wind and Engineering, 11(1) 23–39.
 Arunachalam S., Lakshmanan N. (2015), “Across-wind response of tall circular chimneys to vortex shedding”; Journal of Wind Engineering and Industrial Aerodynamics, 145 187–19
 Wang Ch., Lü Z., Tu Y. ( 2011) , “ Dynamic Responses of Core-Tubes with Semi-Flexible Suspension Systems Linked by Viscoelastic Dampers under Earthquake Excitation”; Advances in Structural Engineering, 14(5, 801-813.
 Zhang X., Qin X., Cherry S., Lian L., Zhang J., Jiang J. (2009), “ A New Proposed Passive Mega-Sub Controlled Structure and Response Control”; Journal of Earthquake Engineering, 13, 252–274.
 Zhang X., Zhang J. L., Wang D., Jiang J. S. (2005) , “Controlling characteristics of passive mega-sub controlled frame subjected to random wind loads”; Journal of engineering mechanics, 131(10), 1046–1055.
 Wu1 J. C. and Yang J. N. (1998), “Active control of transmission tower under stochastic wind”; Journal of Structural Engineering, 124(2), 1302-1312.
 Paz M. (1991), “Structural Dynamics”, Van Nostrand Reinhold, New York, USA.
 Preumont A. (1994), “Random vibration and spectral analysis”, Kluwer academic publishers, Dordrect.
 National Research Council (NRC) (2010). National building code of Canada, Ottawa (Canada): Associate Committee on the National Building Code, National Research Council.
 Simiu E., & Scanlan R. H. (1996), “Wind effects on structures: Fundamentals and applications to design”; New York: Wiley.