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Wind & structures 5건

  1. [국내논문]   Experimental evaluation of aerodynamic damping of square super high-rise buildings   피인용횟수: 4

    Quan, Yong (State Key Laboratory Disaster Reduction in Civil Engineering, Tongji University ) , Gu, Ming (State Key Laboratory Disaster Reduction in Civil Engineering, Tongji University ) , Tamura, Yukio (Department of Architecture, Tokyo Polytechnic University)
    Wind & structures v.8 no.5 ,pp. 309 - 324 , 2005 , 1226-6116 ,

    초록

    Aerodynamic damping often plays an important role in estimations of wind induced dynamic responses of super high-rise buildings. Across- and along-wind aerodynamic damping ratios of a square super high-rise building with a height of 300 m are identified with the Random Decrement technique (RDT) from random vibration responses of the SDOF aeroelastic model in simulated wind fields. Parametric studies on effects of reduced wind velocity, terrain type and structural damping ratio on the aerodynamic damping ratios are further performed. Finally formulas of across- and along-wind aerodynamic damping ratios of the square super high-rise building are derived with curve fitting technique and accuracy of the formulas is verified.

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  2. [국내논문]   Shielding effects and buckling of steel tanks in tandem arrays under wind pressures  

    Portela, Genock (General Engineering Department, University of Puerto Rico ) , Godoy, Luis A. (Civil Infrastructure Research Center, Department of Civil Engineering and Surveying, University of Puerto Rico)
    Wind & structures v.8 no.5 ,pp. 325 - 342 , 2005 , 1226-6116 ,

    초록

    This paper deals with the buckling behavior of thin-walled aboveground tanks under wind load. In order to do that, the wind pressures are obtained by means of wind-tunnel experiments, while the structural non linear response is computed by means of a finite element discretization of the tank. Wind-tunnel models were constructed and tested to evaluate group effects in tandem configurations, i.e. one or two tanks shielding an instrumented tank. Pressures on the roof and on the cylindrical part were measured by pressure taps. The geometry of the target tank is similar in relative dimensions to typical tanks found in oil storage facilities, and several group configurations were tested with blocking tanks of different sizes and different separation between the target tank and those blocking it. The experimental results show changes in the pressure distributions around the circumference of the tank for half diameter spacing, with respect to an isolated tank with similar dimensions. Moreover, when the front tank of the tandem array has a height smaller than the target tank, increments in the windward pressures were measured. From the computational analysis, it seems that the additional stiffness provided by the roof prevents reductions in the buckling load for cases even when increments in pressures develop in the top region of the cylinder.

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  3. [국내논문]   Practical fatigue/cost assessment of steel overhead sign support structures subjected to wind load  

    van de Lindt, John W. (Department of Civil Engineering, Colorado State University ) , Ahlborn, Theresa M. (Civil and Environmental Engineering, Michigan Technological University)
    Wind & structures v.8 no.5 ,pp. 343 - 356 , 2005 , 1226-6116 ,

    초록

    Overhead sign support structures number in the tens of thousands throughout the trunk-line roadways in the United States. A recent two-phase study sponsored by the National Cooperative Highway Research Program resulted in the most significant changes to the AASHTO design specifications for sign support structures to date. The driving factor for these substantial changes was fatigue related cracks and some recent failures. This paper presents the method and results of a subsequent study sponsored by the Michigan Department of Transportation (MDOT) to develop a relative performance-based procedure to rank overhead sign support structures around the United States based on a linear combination of their expected fatigue life and an approximate measure of cost. This was accomplished by coupling a random vibrations approach with six degree-of-freedom linear dynamic models for fatigue life estimation. Approximate cost was modeled as the product of the steel weight and a constructability factor. An objective function was developed and used to rank selected steel sign support structures from around the country with the goal of maximizing the objective function. Although a purely relative approach, the ranking procedure was found to be efficient and provided the decision support necessary to MDOT.

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  4. [국내논문]   Wind effects on a large cantilevered flat roof: loading characteristics and strategy of reduction  

    Fu, J.Y. (Department of Building and Construction, City University of Hong Kong ) , Li, Q.S. (Department of Building and Construction, City University of Hong Kong ) , Xie, Z.N. (Department of Civil Engineering, Shantou University)
    Wind & structures v.8 no.5 ,pp. 357 - 372 , 2005 , 1226-6116 ,

    초록

    Mean and extreme pressure distributions on a large cantilevered flat roof model are measured in a boundary layer wind tunnel. The largest peak suction values are observed from pressure taps beneath conical "delta-wing type" corner vortices that occur for oblique winds, then the characteristics and causes of the local peak suctions are discussed in detail. Power spectra of fluctuating wind pressures measured from some typical taps located at the roof edges under different wind directions are presented, and coherence functions of fluctuating pressures are also obtained. Based on these results, it is verified that the peak suctions are highly correlated with the conical vortices. Furthermore, according to the characteristics of wind loads on the roof, an aerodynamic solution to minimize the peak suctions by venting the leading edges and the corners of the roof is recommended. The experimental results show that the suggested strategy can effectively control the generation of the conical vortices and make a reduction of 50% in mean pressures and 25% in extreme local pressures at wind sensitive locations on the roof.

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  5. [국내논문]   Aeroelastic forces on yawed circular cylinders: quasi-steady modeling and aerodynamic instability  

    Carassale, Luigi (Dipartimento di Ingegneria Strutturale e Geotecnica, University of Genova ) , Freda, Andrea (Dipartimento di Ingegneria Strutturale e Geotecnica, University of Genova ) , Piccardo, Giuseppe (Dipartimento di Ingegneria Strutturale e Geotecnica, University of Genova)
    Wind & structures v.8 no.5 ,pp. 373 - 388 , 2005 , 1226-6116 ,

    초록

    Quasi-steady approaches have been often adopted to model wind forces on moving cylinders in cross-flow and to study instability conditions of rigid cylinders supported by visco-elastic devices. Recently, much attention has been devoted to the experimental study of inclined and/or yawed circular cylinders detecting dynamical phenomena such as galloping-like instability, but, at the present state-of-the-art, no mathematical model is able to recognize or predict satisfactorily this behaviour. The present paper presents a generalization of the quasi-steady approach for the definition of the flow-induced forces on yawed and inclined circular cylinders. The proposed model is able to replicate experimental behaviour and to predict the galloping instability observed during a series of recent wind-tunnel tests.

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