Determination and comparison of wind loads for industrial reinforced concrete chimneys

Karaca, Zeki; Türkeli̇, Erdem

doi:10.1002/tal.617

Cited by 13 publications

(10 citation statements)

References 3 publications

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“…Figure shows the distributions of the means and RMSE of shape coefficient along the circumferential direction for the hyperbolic cooling tower. They are compared with the standard in Code (GB50009‐2012, 2012, DL/T 5339‐2006 2006), the measured results, and the wind tunnel test data . The following conclusions are thus reached: The angles at which the extreme negative wind pressures and flow separation points are found on the distribution curve of the mean shape coefficient for the conical part are consistent with the curve for hyperbolic cooling tower in the Code.…”

Section: Numerical Simulation Results and Analysismentioning

confidence: 60%

Non‐Gaussian characteristics and extreme distribution of fluctuating wind pressures on large cylindrical–conical steel cooling towers

Wang

2017

Structural Design Tall Build

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Large cylindrical-conical steel cooling tower (SCT) represents a new configuration of cooling tower, and its wind load distribution pattern and forming mechanism are very different from those of the traditional hyperbolic cooling towers. Large eddy simulation was used for the numerical simulation on a superlarge cylindrical-conical SCT that exceeds the specification limit, which is also the highest (189 m) SCT under construction in Asia. The surface flow field and time history of 3-D aerodynamic force were obtained for the cylindrical and conical parts, respectively. Comparison with the measurements of other large cooling towers and the results of wind tunnel test confirmed the validity of the numerical simulation. Then, based on the probability density distribution and spatial correlation of representative measuring points, regions of non-Gaussian distribution were identified. The forming mechanism of non-Gaussian wind pressure distribution was revealed from the perspective of the correlation of non-Gaussian distribution versus flow separation and eddy motion. The criteria for classifying the region of non-Gaussian distribution for the cylindrical and conical parts were analyzed, respectively. Research shows that the wind pressures in the windward regions of conical and cylindrical parts obey Gaussian distribution; however, the wind pressures from the region of extreme negative pressure to the region of flow separation are largely non-Gaussian and the wind pressures of the conical part are generally non-Gaussian in the leeward region. Finally, the three algorithms for calculating the extreme values of wind pressure were used, namely, peak factor method, improved peak factor method, and Sadek-Simiu method.The distribution patterns of peak factors and extreme values of wind pressure in SCT towers were analyzed comparatively. The 2-D formulae for fitting the extreme values of wind values for the cylindrical and conical parts were derived by nonlinear least square method. Moreover, strategy for value determination was also presented. The present research aimed to strengthen the understanding of the fluctuating wind pressure distribution and its forming mechanism for large cylindrical-conical SCT towers.

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Section: Numerical Simulation Results and Analysismentioning

confidence: 60%

Non‐Gaussian characteristics and extreme distribution of fluctuating wind pressures on large cylindrical–conical steel cooling towers

Wang

2017

Structural Design Tall Build

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“…As the procedures of the cited standards are open to public, there is no need to define all of the symbols in the wind load calculations. One can obtain the details of the wind loading calculations in these studies [55][56][57][58][59]. Also, in these wind load calculations, basic wind speed is taken as 45 m/s.…”

Section: Calculation Of Wind Loadsmentioning

confidence: 99%

- Dynamic Seismic and Wind Response of Masonry Minarets

Türkeli̇

2020

Period. Polytech. Civil Eng.

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Historical masonry structures i.e. minarets, towers, mosques or bastions are the heritage of past generations to the future societies as they carry the traces of the past communities. Among these structures, historical masonry minarets are one of the most generally constructed structure that reflects the beauty and magnificence of Islamic culture. Under severe winds and earthquakes, most of them were severely damaged or collapsed. Therefore, it is an inevitable duty for us to conduct and investigate their dynamic behavior under these vital actions of nature. In this study, the dynamic seismic and wind response of a historical minaret of İskenderpaşa Mosque that is selected from the technical literature is investigated by using different methods i.e. wind loading procedures of TS498, CICIND Model Code and Eurocode 1, the design spectrums of CICIND Model Code and Eurocode 8 for different types of soils, the time histories of real ground motions of Düzce and Kocaeli Earthquakes. At the end of the study, top joint displacements and stress distributions are obtained and interpreted. The findings of this study showed that the dynamic behavior of this historical masonry minaret is wind dominant (CICIND Model Code) and tensile and shear stress accumulations at the junction point of transition segment and cylindrical body of the minaret is the main reason for the collapse without showing any ductile behavior.

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“…In non‐complex terrain up to a height of about 100–200 m above ground level, it is reasonable to assume that the wind profile follows the logarithmic law under the neutral conditions. Then, the vertical distribution of mean wind speed can be expressed as Equation (Karaca and Türkeli, ).

{\overset{true¯}{U}}_{z} = \frac{1}{k} u_{*} normalln ((), \frac{z}{z_{0}})

where z is the height above the ground, k is the von Karman constant (approximately 0.4), z 0 is the surface roughness length and the typical values of different type of terrains that were listed in literature (Burton et al ., ; Holmes, ), u * is the friction velocity and can be calculated according to Equation .…”

Section: Characteristics Of Near‐ground Windmentioning

confidence: 99%

Wind field simulation of large horizontal‐axis wind turbine system under different operating conditions

Chen

Yang

2015

Structural Design Tall Build

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SUMMARYThis paper proposes a technique of generating turbulent wind velocities on large horizontal-axis wind turbine systems under different operating conditions. The rotational sampling effect, vertical wind shear and coherence between wind velocities at blades and on the tower were taken into account. Coordinate system of wind time series at certain discrete sampling points on the vertical plane of the wind turbine is generated by the hybrid weighted amplitude wave superposition and proper orthogonal decomposition (POD) methods. The POD eigenmodes on the blades after updating locations were calculated subsequently using B-spline surface interpolation method, and the rotationally sampled wind velocities are reconstructed by taking advantage of POD method again. Examples are subsequently presented to validate this proposed technique and demonstrate the generation of wind velocities under different operating conditions. The results show that the simulated spectrum of turbulent wind velocities at blades corresponds well to the measured data and that on the tower agrees well with the fixed point Kaimal spectrum. The reasonable sampling points spacing is suggested to be about 10 m for the wind field simulation of wind turbine system. The proposed method is of great advantage in accuracy and efficiency, which is greatly significant for the fine analysis of multi-megawatt wind turbines.

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Determination and comparison of wind loads for industrial reinforced concrete chimneys

Cited by 13 publications

References 3 publications

Non‐Gaussian characteristics and extreme distribution of fluctuating wind pressures on large cylindrical–conical steel cooling towers

Non‐Gaussian characteristics and extreme distribution of fluctuating wind pressures on large cylindrical–conical steel cooling towers

- Dynamic Seismic and Wind Response of Masonry Minarets

Wind field simulation of large horizontal‐axis wind turbine system under different operating conditions

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