Dynamic response of structures subjected to tornado loads by FEM

Dutta, P.; Ghosh, Anup; Agarwal, B. N. P.

doi:10.1016/s0167-6105(01)00115-5

Cited by 25 publications

(9 citation statements)

References 12 publications

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“…Two similar studies evaluate multi-story structures' responses to a modified RCVM vortex and report maximum response amplification of DLF¼2.0 (Tan, 1975;Seniwongse 1977). Dutta et al (2002) analyze the responses of single-and multi-story structures to a tornadic wind field assigned using Fujita's (1976) wind speed record and Mehta et al (1976) vortex model and report maximum structure response amplification of DLF¼1.735. The preceding list of studies jointly conclude that transient tornadic wind loads are capable of dynamically amplifying loaded structures' response amplitudes.…”

Section: Introductionmentioning

confidence: 99%

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Defining the vortex loading period and application to assess dynamic amplification of tornado-like wind loading

Strasser

Yousef

Selvam

2016

Journal of Fluids and Structures

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a b s t r a c tTornados are transient loading events, and several studies in the literature have shown their capability to produce dynamically amplified structure response. The present study utilizes the dynamic load factor (DLF) concept to develop the first generalized methodology to assess the possible dynamic amplification of structure having specified fundamental period T n to tornadic wind loads. The two-dimensional impact of a rigid, circular cylinder by an impinging vortex is directly simulated; the resulting loading time history is then used to excite a single degree of freedom (SDOF) response model. The vortex load application period T v is defined as the value of T n for which the structure's response experiences greatest dynamic amplification. An expression for T v is defined as a function of three vortex properties: critical radius, translational velocity, and tangential velocity profile, so that T v can be computed using documented tornado-vortex properties. The range of possible tornado-vortex tangential velocity profiles is identified, and DLF curves are defined for the forcing produced by each vortex profile. A review is conducted of the range of documented tornado parameters and fundamental periods of real-world structures. Finally, the documented tornado parameters, expression for T v , and DLF curves for the vortex profiles are used to define the possible dynamic response amplification of a structure as a function of T n .

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Section: Introductionmentioning

confidence: 99%

“…Structure response amplitude may be amplified by DLF of 1.735 (Dutta et al, 2002) to 4.0 (Wen, 1975). 2.…”

Section: Introductionmentioning

confidence: 99%

Defining the vortex loading period and application to assess dynamic amplification of tornado-like wind loading

Strasser

Yousef

Selvam

2016

Journal of Fluids and Structures

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“…Eberline et al (1991) relate the non-linear structural response of a coal conductive system and point out to a large structure sensibility to the tornado translation velocity. Dutta et al (2002) show that the combined effect of the lateral wind load with its vertical component is more harmful than the first one taken separately. A numerical analysis of the rupture of an electric energy transmission tower due to a tornado is performed by Savory et al (2001).…”

Section: Introductionmentioning

confidence: 89%

Tornadic mechanical global actions on transmission towers

Pecin¹,

Almeida²,

Roehl³

2011

J. Braz. Soc. Mech. Sci. & Eng.

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“…According to the formula (9), when the angular velocity is constant, the radius of the rotating [6] air flow layer will decrease when the density of the height increases. That is when a tornado in a moment the position of high quality rotation of the air layer is increased from m 1 to m 2 ( 1 ρ to 2 ρ increase), the tornado in the position of rotary flow height radius also decreased from r 1max to r 2max .…”

Section: Conservation Of Angular Momentum Of Tornadomentioning

confidence: 99%

Energy and Angular Momentum Conservation Analysis of Tornado

Xin¹

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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Abstract. Tornado always exists like funnel shaped, In this paper, according to the basic principles of tornado to establish a physical model of tornado. According to this model, a tornado of angular velocity, density and the spin turn radius in air layer parameterized description. Based on this model, the relationship between the energy of tornado and the parameters of tornado swirling airflow is explored. The rotational motion of a tornado is also restricted by the conservation of its angular momentum, so the relationship between the density and the radius and the angular velocity of the rotating airflow layer is also demonstrated.

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Dynamic response of structures subjected to tornado loads by FEM

Cited by 25 publications

References 12 publications

Defining the vortex loading period and application to assess dynamic amplification of tornado-like wind loading

Defining the vortex loading period and application to assess dynamic amplification of tornado-like wind loading

Tornadic mechanical global actions on transmission towers

Energy and Angular Momentum Conservation Analysis of Tornado

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