scholarly journals Airflow Patterns around Obstacles with Large-Span Shallow Shell Roof: Wind Tunnel Measurements and Direct Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Hongying Jia ◽  
Huixue Dang ◽  
Qianying Ma ◽  
Jun-Hai Zhao
Keyword(s):  
Wind Tunnel ◽  
Spherical Shell ◽  
Pressure Distribution ◽  
Shell Structure ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Mechanical Index ◽  
Shape Coefficient ◽  
Large Span ◽  
Wind Vibration

Wind tunnel tests on the rigid model of large-span shallow spherical shell roof structure were carried out. The variation rule and the calculation method for the average shape coefficient of the fluctuating wind pressure under six different typical wind directions were obtained. The wind pressure distribution of the node deflection and cross section stress was numerically investigated and analyzed. Meanwhile, the effect of mechanics-flow form of the typical spherical shell structure on the wind pressure distribution was analyzed quantitatively. In this study, it is found that the results of numerical simulation agree well with the wind tunnel test data. The study on the mechanical characteristics, as well as the wind vibration research, of the spherical shell structure in different working conditions provides a reliable theoretical basis for the mechanical index of the wind vibration.

Wind Pressure Distribution on a Large-Span Roof Structure

2012 ◽  
Vol 166-169 ◽  
pp. 234-238
Author(s):  
Qin Hua Wang ◽  
Bi Qing Shi ◽  
Le Le Zhang
Keyword(s):  
Wind Tunnel ◽  
Data Processing ◽  
Pressure Distribution ◽  
Pressure Measurement ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Large Span ◽  
Roof Structure

In this paper, wind tunnel test of a large-span roof structure is firstly introduced. Secondly, data processing on synchronous multi-spots pressure measurement test is given. Wind pressure distribution is calculated by using the method mentioned in this paper. Some results and conclusion are useful for design of large-span roof structure.

Wind Pressure Coefficients Determination for Pre-Homogenization Storage in Cement Mill

2011 ◽  
Vol 94-96 ◽  
pp. 1026-1030
Author(s):  
Yue Ming Luo ◽  
Yue Yin ◽  
Xi Liang Liu
Keyword(s):  
Wind Tunnel ◽  
Spherical Shell ◽  
Rapid Development ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Wind Engineering ◽  
Pressure Coefficients ◽  
Continuous Innovation ◽  
Structural Style ◽  
Wind Pressures

Due to the increasing of wind disaster, structural wind engineering arouses more and more attention recently, with rapid development on spatial structure and continuous innovation of structural style. The main purpose of structural wind engineering is to calculate the wind pressure coefficients of structure. In this paper, the numerical wind tunnel method (NWTM), based on the Computational Fluid Dynamics (CFD), is applied to study wind load. The wind pressure coefficients of reticulated spherical shell with the 4.6m high wall were first determined, using the NWTM. The results are then compared with the wind tunnel test (WTT) and good agreement is found. The feasibility and reliability of NWTM were then verified. As the second example, NWTM is carried out to predict wind-induced pressure on reticulated spherical shell without wall. Further the distribution behavior of wind pressures on this kind of structures is discussed which could provide professionals the reference for the design of structure.

Numerical Simulation of Pressure Distribution around the Reticulated Shell Structure with Large Span

2013 ◽  
Vol 405-408 ◽  
pp. 710-712
Author(s):  
Zi Hou Yuan ◽  
Yi Chen Yuan ◽  
Wei Sun
Keyword(s):  
Pressure Distribution ◽  
Shell Structure ◽  
Fluid Dynamic ◽  
Flow Analysis ◽  
Wind Load ◽  
Wind Pressure ◽  
Large Span ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software ◽  
Reticulated Shell Structure

In order to investigate the pressure distribution around the reticulated shell structure with large span, a commercial Computational Fluid Dynamic software Fluent is employed to obtain the wind load and the coefficients of the time averaged pressure distribution around the reticulated shell structure in this paper. The numerical simulations of surface pressure are consistent with the experimental results. The characteristics of the wind pressure distribution are described through the flow analysis around the reticulated shell structure. All these discoveries can be used as a reference for the new version of the wind load criteria.

The Test Study of Shape Coefficient of Low-Rise Buildings Roof with Different Positions of Openings

2012 ◽  
Vol 446-449 ◽  
pp. 3092-3095
Author(s):  
Ji Zhou ◽  
Yuan Ming Dou ◽  
Xi Yuan Liu ◽  
Ji Shu Sun
Keyword(s):  
Wind Tunnel ◽  
Pressure Measurement ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Wind Damage ◽  
Building Roof ◽  
Wind Resistance ◽  
Shape Coefficient ◽  
Test Study ◽  
The One

The majority of low-rise buildings are generally susceptible to wind damage in previous wind disaster, thus it is necessary to gain understanding of the characteristics of wind pressure for these types of building. Based on Wind Tunnel Test, the shape coefficients were studied with pressure measurement on gable roofs laying aside purlin of low-rise building roof in this paper. Three aspects were arerespectively discussed: the lows of shape coefficients and the shape coefficient value with specific wind angle on roofs of the houses completely closed, the house opened doors and windows and the house opened the hole on roof with different wind angle. The laws of shape coefficients were propounded for low-rise buildings with different positions of openings in contrast to load code. A detailed analysis of the experimental results shows that the shape coefficients will increase notably when there are the openings on metope and on roof, and the one is outward of roof, another is inward of roof. It is expected that the results should be valuable for the wind-resistance design of low-rise buildings.

Numerical Simulation of Mean Wind Pressure on the Roof of Yantai Gymnasium

2012 ◽  
Vol 226-228 ◽  
pp. 1260-1264
Author(s):  
Xi Meng ◽  
Ri Gao ◽  
Hai Jun Zhang
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Negative Pressure ◽  
Small Area ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Windward Side ◽  
Positive Pressure ◽  
Distribution Law

In order to determine the distribution of wind load on the roof, wind tunnel test and numerical simulation are both carried out. Then the distribution of mean wind pressure under different wind directions is obtained and the features of mean wind pressure are also analyzed. The datas show that wind pressure distribution of the roof is predominantly negative pressure; only a small area of windward side is positive pressure distribution. The peak of negative pressure appears at the roof ridge or windward long eaves, and varies as changes of wind direction. Meanwhile, the comparison between the results of the numerical simulation and wind tunnel test shows that the distribution law of both is almost the same, but in some areas that flow separation is serious, the error is larger. Then the reasons for the error are discussed.

Wind Pressure Distribution on a Multiple Hyperbolic Paraboloid Shell Roof Building

1987 ◽  
Vol 2 (1) ◽  
pp. 49-54
Author(s):  
A. J. Dutt
Keyword(s):  
Wind Tunnel ◽  
Pressure Distribution ◽  
Model Test ◽  
Wind Pressure ◽  
Wind Tunnel Experiments ◽  
Hyperbolic Paraboloid

Wind pressure distribution was investigated on a multiple hyperbolic paraboloid (HP) shell roof building by model test in the wind tunnel. The roof of the model was a grouping of four similar HP shells in a ‘normal’ array forming a square in plan. Wind tunnel experiments were carried out; wind pressure distribution and the contours of wind pressure on shell roof and walls were determined for various wind directions. The average suctions on roof were computed and compared with those on a single HP shell roof and on a multiple HP shell roof having a ‘sawtooth’ array. The highest point suction encountered was −4·12 q whilst the maximum average suction on the roof was −0·61 q.

WIND PRESSURE DISTRIBUTION ON LOW-RISE BUILDINGS WITH CYLINDRICAL ROOFS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Astha Verma ◽  
Ashok Kumar Ahuja
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Open Circuit ◽  
Wind Pressure ◽  
Wind Loads ◽  
Wind Loading ◽  
Pressure Coefficients ◽  
Available Information

Wind is one of the important loads to be considered while designing the roofs of low-rise buildings. The structural designers refer to relevant code of practices of various countries dealing with wind loads while designing building roofs. However, available information regarding wind pressure coefficients on cylindrical roofs is limited to single span only. Information about wind pressure coefficients on multi-span cylindrical roofs is not available in standards on wind loads. Present paper describes the details of the experimental study carried out on the models of low-rise buildings with multi-span cylindrical roofs in an open circuit boundary layer wind tunnel. Wind pressure values are measured at many pressure points made on roof surface of the rigid models under varying wind incidence angles. Two cases namely, single-span and two-span are considered. The experimental results are presented in the form of contours of mean wind pressure coefficients. Results presented in the paper are of great use for the structural designers while designing buildings with cylindrical roofs. These values can also be used by the experts responsible for revising wind loading codes from time to time.

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.

Program for the Analysis of Wind-Induced Vibration of Steel Roof Structures

2011 ◽  
Vol 284-286 ◽  
pp. 517-522
Author(s):  
Wei Guo Yang ◽  
Yao Feng Wang
Keyword(s):  
Wind Pressure ◽  
Wind Loads ◽  
Frequency Domain Method ◽  
Large Span ◽  
Finite Element Software ◽  
Roof Structure ◽  
Wind Vibration ◽  
Vertical Winds ◽  
Wind Induced Vibration ◽  
Steel Roof

Wind loads are key considerations in the structural design of steel roof structures, especially for large span ones. The analysis of wind loads on large span steel roof structure (LSSRS) requires large amounts of calculations. Due to combined effects of horizontal and vertical winds, the wind induced vibrations of LSSRS are analyzed with the frequency domain method as the first application of the method for the analysis of wind responses of LSSRS. A program is developed to analyze the wind-induced vibrations due to a combination of wind vibration modes. The program, which predicts the wind vibration coefficient and wind pressure acting on the LSSRS, is designed with input and output interfaces to other finite element software, resulting in preferably solving the wind load analytical problem in the design of LSSRS. The effectiveness and accuracy of the proposed method and the program are verified by numerical analyses of practical projects.

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