scholarly journals Effects of Side Ratio on Wind-Induced Pressure Distribution on Rectangular Buildings

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
J. A. Amin ◽  
A. K. Ahuja
Keyword(s):  
Pressure Distribution ◽  
Incidence Angle ◽  
Pressure Coefficient ◽  
Side Wall ◽  
Wind Pressure ◽  
Surface Pressure Distribution ◽  
Side Ratio ◽  
Building Models ◽  
Mean Pressure ◽  
Wind Pressures

This paper presents the results of wind tunnel studies on 1 : 300 scaled-down models of rectangular buildings having the same plan area and height but different side ratios ranging from 0.25 to 4. Fluctuating values of wind pressures are measured at pressure points on all surfaces of models and mean, maximum, minimum, and r.m.s. values of pressure coefficients are evaluated. Effectiveness of the side ratios of models in changing the surface pressure distribution is assessed at wind incidence angle of 0° to 90° at an interval of 15°. Side ratio of models has considerable effects on the magnitude and distribution of wind pressure on leeward and sidewalls but it has very limited effect on windward walls at wind incidence angle of 0°. For building models with constant cross section, change in side ratio does not significantly affect the general magnitude of peak pressures and peak suctions, but rather the wind angle at which they occur. The regression equation is also proposed to predict the mean pressure coefficient on leeward wall and side wall of rectangular models having different side ratios at 0° wind incidence angle.

Mean Wind Pressure Field on the Typical Large-Span Roof Structures

2012 ◽  
Vol 166-169 ◽  
pp. 19-24
Author(s):  
Fang Hui Li ◽  
Ming Gu ◽  
Zhen Hua Ni ◽  
Shi Zhao Shen
Keyword(s):  
Pressure Field ◽  
Pressure Coefficient ◽  
Wind Pressure ◽  
Pressure Data ◽  
Shape Factors ◽  
Local Shape ◽  
Wind Pressure Coefficient ◽  
The Mean ◽  
Urban Terrain ◽  
Wind Pressures

The wind tunnel tests of some typical large roofs, including a saddle roof, pitched roof and domes, are carried out with various terrains which cover suburban and urban exposures. The wind pressure data of roofs are obtained by using the synchronous multi-pressure scanning technique. The wind pressure coefficient and local shape factors of the wind load was investigated. The effects of various terrains on wind pressures of roofs are discussed. From the results, we can see mean pressures of these roofs exposed to the mean pressures exposed to the suburban terrain are 2 or 3 times those exposed to the urban terrain. And the terrains are no directly influence to the wind pressure shape factors.

Experimental Investigation of the Wind Pressure Distribution and Wind Interference Effects on a Typical Tall Building

2013 ◽  
Vol 639-640 ◽  
pp. 444-451 ◽  
Author(s):  
Yi Li ◽  
Q.S. Li ◽  
K.L Ju
Keyword(s):  
Pressure Distribution ◽  
Wind Tunnel Test ◽  
Side Wall ◽  
Tall Buildings ◽  
Tall Building ◽  
Wind Pressure ◽  
Shielding Effect ◽  
Interference Effects ◽  
Large Cities ◽  
Pressure Coefficients

Most tall buildings are constructed in the prosperous center of large cities, where is inevitable to be surrounded by many interfering buildings. Wind interference effects among buildings should not be neglected. Therefore, it is necessary to investigate wind interference effects on such tall buildings. Based on the wind tunnel test of rigid model of a tall building, the wind pressure distribution on the building with interfering buildings around it has been researched, the contours of the mean and fluctuate wind pressure coefficients have also been presented. It has been found that shielding effect and channeling effect are significant in the wind interference effects on building. Wind pressure coefficients on side wall and leeward wall of a upstream building may be dramatically changed in case the wake boundary of the upstream building is interfered. The conclusions might be used as reference to structural design and plan.

Correlation and Combination Factors of Wind Forces on Cylindrical Roof Structures

2017 ◽  
Vol 17 (09) ◽  
pp. 1750104 ◽  
Author(s):  
Bo Chen ◽  
Pengpeng Zhong ◽  
Weihua Cheng ◽  
Xinzhong Chen ◽  
Qingshan Yang
Keyword(s):  
Side Wall ◽  
Single Layer ◽  
Correlation Coefficients ◽  
Wind Load ◽  
Wind Pressure ◽  
Wind Loads ◽  
Horizontal Wind ◽  
Parameter Study ◽  
Response Component ◽  
Wind Pressures

The correlations among wind pressures on roof and walls are examined for the cylindrical roof buildings with different rise-span ratios based on wind tunnel data. Wind-induced dynamic response is also analyzed with a parametric study concerning span length, rise-span ratio, stiffness of supporting frames and connection type between roof and supporting frames, where the roof system is a single-layer cylindrical reticular shell. For both roof and supporting frames, the responses induced by vertical wind loads on the roof and by horizontal wind loads on the walls are investigated. The correlation coefficients of these response components are examined. The results showed that the fluctuating wind pressure on the roof is strongly correlated with the wind pressure on the side wall and the leeward wall, but weakly correlated with the wind pressure on the windward wall. The response of roof and supporting frames caused by the wind loads on the roof is much larger than that of wind loads on the walls. On the bases of a comprehensive parameter study and complete quadratic combination (CQC) rule, a practical simplified combination rule is suggested for estimating response of roof and supporting frames. It is given as sum of response component caused by wind load on roof and that of wind load on walls multiplied with a combination factor of [Formula: see text].

Wind Load Characteristics of Tall Building with Atrium

2013 ◽  
Vol 639-640 ◽  
pp. 515-522
Author(s):  
Yong Gui Li ◽  
Q.S. Li
Keyword(s):  
Wind Tunnel ◽  
Critical Role ◽  
Pressure Coefficient ◽  
Tall Building ◽  
Wind Pressure ◽  
Wind Loads ◽  
Design Guideline ◽  
Pressure Coefficients ◽  
Opening Ratio ◽  
Wind Pressures

Wind tunnel test of 1:500 rigid model of tall building with atrium was carried out. Based on the experimental results, characteristics of wind pressures on atrium facades and wind loads on the structure were investigated in detail. The results show that the formation of flow separation on the building top plays a critical role in the generation of wind pressures on the atrium facades. Meanwhile, wind pressure coefficient distributions on the atrium facades are found to be relatively uniform. Moreover, the horizontal and vertical correlations of pressure coefficient exhibit high at most locations on atrium facades. With the increasing of the opening ratio, the mean wind pressure coefficients first decreased and then stabilized, and the fluctuating wind pressure coefficients first decreased and then increased. A design guideline for the wind-resistant design of atrium facades was proposed, and the results predicted by the proposed guideline were in good agreement with those from the wind tunnel tests, indicating that the proposed guideline can be used in engineering applications. When the opening ratio is no more than 5.33%, the effect of the facade pressures within the atrium on the wind loads on the structure can be ignored. For such cases, the wind-resistant design for a tall building with atrium can refer to that of a similar shape tall building without atrium.

Study on Characteristics of Wind Loading on Open Ended Cantilevered Roof under Typhoon

2012 ◽  
Vol 256-259 ◽  
pp. 788-791
Author(s):  
Zhi Xiang Yin ◽  
Yu Zhang
Keyword(s):  
Pressure Distribution ◽  
Pressure Coefficient ◽  
Surface Wind ◽  
Great Influence ◽  
Wind Load ◽  
Wind Pressure ◽  
Wind Loading ◽  
Load Model ◽  
Large Span ◽  
Wind Pressure Coefficient

Open ended cantilevered roof is different from enclosed roof, because its change of wind pressure distribution is complex, and the wind directions have great influence on it. Up to now, for the characteristics of the structure are very complicated, there is no appropriate wind load model can be used in design, especially under typhoon, a specific wind field. So it is necessary to study the characteristics of wind load on open ended cantilevered roofs of typhoon. Using FLUENT and Computational Fluid Dynamics technology, based on the conventional, Tianpu’s and Shiyuan’s turbulence intensity of the typhoon scenario, a numerical simulation of wind flow around a large-span cantilevered roof was carried out. Analyzed different wind angles of the wind pressure distribution regularities on large-span cantilevered roof. The paper determined the distribution of the surface wind pressure coefficient for the cantilevered roofs, as well as the wind-sensitive parts of structures.

WIND PRESSURE DISTRIBUTION ON CIRCULAR CANOPY ROOFS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Neelam Rani ◽  
Ashok Kumar Ahuja
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Open Circuit ◽  
Wind Pressure ◽  
Cross Sectional ◽  
Pressure Coefficients ◽  
Wind Pressures

The present study gives information related to wind pressure distribution on single span and multi span circular canopy roofs. The experiments are carried out in an open circuit boundary layer wind tunnel. Wind pressure is measured on both upper and lower roof surfaces of circular canopy roof model made of Perspex sheet. Models are tested under varying wind incidence angles between 0° and 90° at an interval of 15° on isolated model and 0° to 180° at an interval of 30° on models with multi-span canopy roof. Values of mean wind pressure coefficients are evaluated from the measured values of wind pressures. Results of the study are presented in the form of contours, cross sectional variation and face average values of pressure coefficients. The results of the study are of great use for the structural designers for designing circular canopy roofs.

WIND PRESSURE DISTRIBUTION ON NORTH-LIGHT INDUSTRIAL BUILDING ROOF STUDY

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Astha Verma ◽  
Ashok Kumar Ahuja
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Wind Pressure ◽  
Closed Circuit ◽  
Industrial Building ◽  
Building Roof ◽  
Pressure Coefficients ◽  
Wind Pressures

Present paper describes details of the experimental study carried out on the models of industrial building with north-light roof in order to generate the information about wind pressure distribution on it. The models are tested in a closed circuit boundary layer wind tunnel to measure values of wind pressures on roof surface. Four cases namely one, two, three and four spans are considered. The side of Perspex sheet model in case of multi-span study places plywood models. Wind is made to hit the models at 13 wind incidence angles from 0° to 180° at an interval of 15°. Values of mean wind pressure coefficients are evaluated from the measured values of wind pressures and contours are plotted.

Numerical Analysis on the Pressure Distribution of Long Oblate Chimney

2012 ◽  
Vol 591-593 ◽  
pp. 2068-2071
Author(s):  
Zi Hou Yuan ◽  
Zhi Lan Zhan
Keyword(s):  
Pressure Distribution ◽  
Flow Model ◽  
Wind Load ◽  
Wind Pressure ◽  
Windward Side ◽  
Positive Pressure ◽  
Wide Face ◽  
Narrow Face ◽  
Surface Pressure Distribution ◽  
Pressure Area

In order to investigate wind load for long oblate chimney, a commercial computational software “Fluent” was employed to solve the time-averaged k-ε turbulent flow model for Realizable form. The flow structure and surface pressure distribution on the long oblate chimney upon facing wind was obtained for the wide-face and the narrow-face, respectively. The windward side of long oblate chimneys bears positive pressure, while the largest negative pressure area is on both sides of chimney. The characteristics of the wind pressure distribution were explained by analyzing the flow around the chimney. These discoveries can be used as a reference, for the new version of the wind load criteria.

scholarly journals Influence of the near standing hall for wind flowing around group of circular cylinders

2020 ◽  
Vol 310 ◽  
pp. 00013 ◽  
Author(s):  
Ivana Veghova ◽  
Olga Hubova
Keyword(s):  
Wind Tunnel ◽  
Pressure Distribution ◽  
Pressure Coefficient ◽  
Wind Pressure ◽  
Circular Cylinders ◽  
Wind Flow ◽  
Force Coefficient ◽  
Turbulent Wind ◽  
Wind Speeds ◽  
Wind Pressure Coefficient

This article deals with experimental investigation of air flow around in – line standing circular cylinders and influence of nearby standing hall on external wind pressure distribution. The wind pressure distribution on the structures is an important parameter in terms of wind load calculation. For vertical circular cylinders in a row arrangement only wind force coefficient is possible find in Eurocode. 1991-1-4. External wind pressure coefficient depends on wind direction and the ratio of distance and diameter b. Influence of nearby standing structure is not possible find in Eurocode. The series of parametric wind tunnel studies was carried out in Boundary Layer Wind Tunnel (BLWT) STU to investigate the external wind pressure coefficient in turbulent wind flow. Experimental measurements were performed in BLWT for 2 reference wind speeds, which fulfilled flow similarity of prototype and model. We have compared the results of free in - line standing 3 circular cylinder and influence of hall on distribution of wind pressure at 3 height levels in turbulent wind flow and these results were compared with values in EN 1991-1-4.

Wind Tunnel Test of Tall Buildings with Irregularities of Elevation

2014 ◽  
Vol 578-579 ◽  
pp. 1208-1211
Author(s):  
Jian Guo Zhang ◽  
Hui Min Zhuang
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Tall Buildings ◽  
Wind Pressure ◽  
High Rise ◽  
Pressure Distributions ◽  
Building Models ◽  
The Mean ◽  
Wind Pressures ◽  
Fluctuating Wind

In this paper, 2 high-rise building models with ladder and cascade irregularities of elevation were tested in a wind tunnel respectively to measure the mean and fluctuating wind pressure distributions. The mean and RMS (root-mean-square) coefficients of the drag, lift and torsion moment on the measuring layer were obtained from the wind pressures. In the direction which the buildings were positive in the wind, the variation of these above mentioned coefficients with height and the power spectrum densities of the fluctuating wind loads on sudden changed positions were analyzed in detail. Compared with the elevation regular tall building, the wind load characteristics of irregular ones were more complicated.

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