Modelling of nonlinear damping characteristics of a viscoelastic structural damper

Horr, A.M.; Schmidt, Lewis C.

doi:10.1016/0141-0296(95)00061-5

Cited by 26 publications

(15 citation statements)

References 5 publications

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“…1. The spectral solution for the flexural vibration of a beam can be found as (Horr 1995;Horr and Schmidt 1996a, 1996b, 1997 [1]…”

Section: Exact Spectral Modal Analysismentioning

confidence: 99%

“…9 shows the full three-dimensional model for three guyed tower structures with all conductors, boundary elements, and cables. Two different methods have been used to analyze the structure: (1) the conventional finite element method with the large strain Timoshenko beam elements and spring-dashpot damping element at boundaries and (2) the frequency domain spectral element method using advanced complex fractional spring-spring pot damping element, developed in Horr and Schmidt (1996b), at boundaries. The conventional finite element model consists of 11 108 conventional elements, including large strain beam, large strain rod, nonlinear tension-only cable, nonlinear joint, and boundary elements.…”

Section: Collapse Analysis Of Manitoba Hydro's Guyed Towersmentioning

confidence: 99%

“…Boundary elements have been modelled using the nonlinear spring-springpot damping element developed earlier. The fractional derivative complex modulus (Horr 1996b) is used to model the nonlinear modulus for material damping in a three-dimensional spectral model for the guyed tower structures. The iterative AFT (alternative frequency/time) method of nonlinear analysis, discussed earlier, has been used to obtain the nonlinear frequency domain analysis.…”

Section: Collapse Analysis Of Manitoba Hydro's Guyed Towersmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study

Horr¹,

Yibulayin²,

Disney³

2004

Can. J. Civ. Eng.

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Dynamic response of large complex space structures under wind loading is important in terms of performance and safety. Conventional method of wind loading calculation has been used successfully in codes to analyze large space structures. The method can be applied by approximating the air pressure, induced by wind, on the surfaces of structures. Although this replaces a wind loading test using complicated wind tunnel tests for any structural systems, the accuracy of the method, in the case of complex geometry guyed tower structures, is a matter of consideration. Hence, it is desirable to search for a procedure with more accuracy and reliability. In this respect, attention is paid to the advanced spectral element method and the computational fluid dynamics. Using the proposed formulation, a material and geometric nonlinear dynamic analyses have been performed to simulate post-buckling behaviours and also collapse modes for series of Manitoba Hydro's guyed towers under extreme wind loading conditions. Résumé : La réponse dynamique de grandes structures tridimensionnelles complexes sous des charges exercées par le vent est importante en termes de rendement et de sécurité. La méthode conventionnelle de calcul des charges dues au vent a été utilisée avec succès dans les codes pour analyser des grandes structures tridimensionnelles. La méthode peut être utilisée en appliquant une approximation de la pression d'air, induite par le vent, sur la surface des structures. Bien que cela remplace un essai des charges exercées par le vent qui utilise des essais compliqués en soufflerie pour tout système structural, il faut tenir compte de l'exactitude de la méthode dans le cas des tours haubanées, qui sont des structures géométriques complexes. Il est donc désirable de rechercher une procédure plus exacte et plus fiable. Concernant ces points, nous portons notre attention sur la méthode avancée des éléments spectraux et la dynamique des fluides numérique. En utilisant la formulation proposée, une analyse des matériaux et des analyses géométriques non linéaires ont été effectuées pour simuler le comportement post-flambement ainsi que les modes d'effondrement pour des séries de tours appartenant à Manitoba Hydro sous des conditions extrêmes de charges dues au vent.Mots clés : dynamique des fluides numérique, charge exercée par le vent, mode d'effondrement, analyse non linéaire, post-flambement.[Traduit par la Rédaction]

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“…1. The spectral solution for the flexural vibration of a beam can be found as (Horr 1995;Horr and Schmidt 1996a, 1996b, 1997 [1]…”

Section: Exact Spectral Modal Analysismentioning

confidence: 99%

Section: Collapse Analysis Of Manitoba Hydro's Guyed Towersmentioning

confidence: 99%

Section: Collapse Analysis Of Manitoba Hydro's Guyed Towersmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study

Horr¹,

Yibulayin²,

Disney³

2004

Can. J. Civ. Eng.

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“…Figure 5 shows the conventional and proposed model where the dashpot is replaced by a diamondlike spring-pot. For the conventional parallel spring and dashpot damping element, the stress can be written as (Horr and Schmidt, 1996b)…”

Section: Damping Elementsmentioning

confidence: 99%

“…where G 1 and G 2 are elastic spring stiffness and dashpot coefficient of viscosity. This equation can be written in the frequency domain as (Horr and Schmidt, 1996b)…”

Section: Damping Elementsmentioning

confidence: 99%

Multi‐layered energy absorber frames for tall buildings under high‐speed impact

Horr¹,

Safi²

2003

Structural Design Tall Build

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Based on the advanced fractional derivative damping theory for vibration of large systems and the flexible surfaceto-surface advanced contact theory, a new design strategy has been presented to deal with the high-speed impact of flying objects into tall buildings. Using a multi-layered frame system with external energy absorber frame and a new individual grid-stiffened flooring system (IGSF), a new system has been design to resist the initial impact force and the progressive collapse phenomena. The system can also guide the heat waves caused by the explosion using a special frame system. These characteristics of the new design method have been shown graphically using a full documented numerical example, which highlights the efficiency of the new multi-layered frame system under high-speed impact. The advanced flexible surface-to-surface contact theory is used to model the actual initial impact force and the advanced fractional derivative damping theory is used to obtained the energy absorption characteristics of large-scale dampers used in the external frame system. The purpose of this paper is to present a new design method, which improves the resulting dynamic responses of a tall building induced by a high-speed impact of a flying object.

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Full dynamic analysis of Tehran telecommunication tower; linear and nonlinear responses

Khaloo¹,

Asadpour²,

Horr³

2001

Struct. Design Tall Build.

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Dynamic response of large concrete tower structures with passive or active damping is important in terms of performance under dynamic loads. Structural instability mostly arises as a result of losing the energy capacity in the system, which forces the system to act as a mechanism. The purpose of this paper is to present three different finite element models to investigate the linear and nonlinear response of the Tehran telecommunication tower. The tower is ranked the fourth tallest structure in the world and has been under construction since 1997. Using a mathematical model, an efficient method is used to take into account the cracking and crushing of the reinforced concrete material as well as large deformation effects. The linear and nonlinear dynamic characteristics of the large tower may be defined by using an advanced formulation for the concrete element. Then, the proposed advanced element is used to model a full‐scale finite element mesh to derive the dynamic response of the Tehran telecommunication tower structure with use of a computer program. Copyright © 2001 John Wiley & Sons, Ltd.

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Modelling of nonlinear damping characteristics of a viscoelastic structural damper

Cited by 26 publications

References 5 publications

Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study

Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study

Multi‐layered energy absorber frames for tall buildings under high‐speed impact

Full dynamic analysis of Tehran telecommunication tower; linear and nonlinear responses

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