Wind-induced Interference Effects Research Articles

Study on the Wind-induced Interference Effect of a Large-span Roof Structure Building Group

The wind-induced interference effects existing during the construction of a building group were studied in the context of the Zhangjiakou Olympic Sports Center project. Based on CFD numerical simulations, 120 and 96 different working conditions during construction of a swimming pool and speed skating hall were simulated and analyzed respectively, and the numerical simulation results were found to be in high agreement with the wind tunnel test results, which verified the accuracy and feasibility of the numerical simulation. By comparing the wind-induced interference effects of the surrounding buildings on the swimming pool and the speed skating hall during different construction periods, it was found that the swimming pool was more affected by the interference of the surrounding buildings than the speed skating hall, and the wall area was more affected by the interference than the roof area. The wind-induced response of the swimming pool structure during different construction periods was analyzed, and it was found that the interference effect under some working conditions had a greater impact on the structural stress, and it was suggested that the wind interference effect brought about by the construction of the building should not be ignored in such projects.

Experimental study on wind-induced interference effects between two square-section high-rise buildings in polar coordinates

Experimental study on wind-induced interference effects between two square-section high-rise buildings in polar coordinates

Large eddy simulation on wind-induced interference effects of staggered chamfered square cylinders

Chamfered corners in buildings are the main means to reduce the control effect of wind load on the structure, and the interference effect of chamfered buildings cannot be ignored. At present, only the mutual interference coefficients of square and rectangular section buildings are given in the Chinese code, without the interference effect of chamfered buildings being specified. Therefore, in this paper, aerodynamic force and wind pressure coefficients of chamfered square cylinders of different spacing are obtained by the large eddy simulation method. Wind load characteristics, non-Gaussian characteristics and interference effects of chamfered square cylinders with different arrangements are studied based on aerodynamic coefficients, wind pressure coefficients and interference coefficients. The results show that when the wall y plus value is 1, the large eddy simulation is the most accurate to simulate the wind load and wind field parameters. Besides, the aerodynamic effects, non-Gaussian characteristics and interference effects between the chamfered square cylinders are mainly controlled by the cross-wind interval and the spacing (4.0, 4.0) is the characteristic coordinate. That means, when the spacing is smaller than this coordinate, the interference effect of the square cylinder is more obvious. When the spacing coordinate is greater than (4.0, 4.0), the aerodynamic coefficients and non-Gaussian regional distributions of the principal square cylinder and the isolated cylinder are the same, and the interference factor approaches 1.

Wind-Induced Interference Effects due to Partial Shielding of Building

Wind-Induced Interference Effects due to Partial Shielding of Building

ANN based prediction of wind induced interference effects on hexagonal plan shaped tall buildings with openings

ANN based prediction of wind induced interference effects on hexagonal plan shaped tall buildings with openings

Experimental investigations on the wind load interference effects of single-axis solar tracker arrays

Aiming at the interference effect of wind loads on single-axis solar tracker arrays, this study conducts rigid-model pressure measurement wind tunnel tests on a single-row solar tracker and solar tracker arrays. The effects of the tilt angle and wind direction on aerodynamic characteristics are examined. The basic characteristics of the wind-induced interference effects of a single-axis solar tracker array are clarified. The results reveal that when the tilt angle is small, the interference effect is small, the tilt angle increases, the interference effect becomes stronger. From the mean pressure and torque coefficients, the interference effect is mainly manifested as a shielding effect. Based on the fluctuating pressure and torque coefficients, the interference effect appears as a shielding effect and an amplification effect in small- and large-tilt angle ranges, respectively. The wind load power spectrum of the solar modules in the rear-row of the solar tracker arrays presents remarkable frequency peaks, and is more affected by wind-induced vibration than the front module. The influence of the wind direction results in nonuniform distributions of wind loads along the length of the solar tracker. Thus, the enhancement in wind loads on the edge areas of solar arrays caused by the wind direction should be considered.

Wind-Induced Interference Effects on Low-Rise Pitched Roof Structure Based on CFD Simulations

Wind-Induced Interference Effects on Low-Rise Pitched Roof Structure Based on CFD Simulations

Proximity effects between two plus-plan shaped high-rise buildings on mean and RMS pressure coefficients

Wind-induced interference effects may result in a significant increase or decrease in the wind loads on the buildings constructed in groups due to modifying wind flow around, depending on the shape and relative location of the buildings. Experimental study of wind-induced interference effects on mean and root mean square (RMS) pressure coefficients between two tall buildings are investigated in detail for various interference conditions in this study. The Interference effects on mean and RMS pressure coefficients are presented as interference factors i.e. mean interference factor (MIF) and RMS interference factor (RIF). Results show that the interference effects on local wind pressure are significantly higher on the windward side's faces near the recessed corner. The full blockage condition generates suction on walls facing the gap. The half blockage and no blockage conditions create a more severe interference effect than the full blockage. The maximum value of MIF is 4, 9 and 13 in full, half and no blockage condition, respectively. Interference effects result in reduced wind load on side faces and faces at the leeward side. Suction at side faces reduced approximately by 65% in full blockage condition. RIF’s values less than unity are observed for all interference cases.

Evaluation of Wind Induced Interference Effects on Shape Remodeled Tall Buildings

Evaluation of Wind Induced Interference Effects on Shape Remodeled Tall Buildings

Loss assessment of wind-induced damage for residential buildings groups based on engineering vulnerability

Loss predictions and assessments for residential building groups are crucial processes during extreme events such as wind hazards. The primary purpose of the present work is to improve the existing loss assessment methodology for residential building groups under wind hazards by considering the wind-induced interference effects between building groups, such as those based on the building locations, area density, wind direction, and wind speed. The failure characteristics of the envelope components under complex and strong wind loads are obtained, and the failure laws of the envelope components caused by strong winds are revealed as the wind speed, wind direction, and building area density are changed. The results can provide advice for government departments and residents regarding the arrangement of buildings and reinforcement of envelope components.

Performance of a TMD to Mitigate Wind-Induced Interference Effects between Two Industrial Chimneys

The present paper studies the performance of a tuned mass damper (TMD) installed in a 183 m tall chimney located at the edge of the wake shed by another chimney. Numerical and experimental results are available. For the simulations, wind action is considered by solving several 2D flow problems on a selected number of horizontal planes, in the transverse direction to the stacks. On such planes, Navier-Stokes equations are solved to estimate the fluid action at different positions of the chimneys and standard interpolation techniques are applied in the vertical direction. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to consider the moving domain, and a fractional-step scheme is used to solve the fluid field. For the structural modelling, chimneys are meshed using 3D beam finite elements. The time integration procedure used for the structural dynamics is based on the standard second order Bossak method. For each period of time, the fluid problem is solved, the aeroelastic analysis is carried out and the geometry of the fluid mesh of each plane is updated according to the structural movements. With this procedure and model updating techniques, the response of the leeward chimney is evaluated for different scenarios, revealing an interesting dependence of the TMD performance on the wind speed and direction.

Wind induced interference effects on two, three and four building configuration

Wind induced interference effects on two, three and four building configuration

Wind induced interference effects on two, three and four building configuration

Wind loading codes provide the guidelines to design isolated building structures resistant to wind. But the presence of a structure in the vicinity can significantly alter the wind environment. Such phenomenon known as interference effects need to be addressed while designing structures. Several experimental studies were made on interference effects of group of buildings. Multiple configurations of building arrangement in a group, adds to the complexity and increased number of experimental cases. Limited studies exists which model interference effects of group of buildings using computational fluid dynamics (CFD) techniques. The present paper investigates on interference effects of two, three and four buildings arranged in different configuration exposed to different wind incident angles using CFD. The results indicate enhancement of wind load or shielding on different faces of building for the same interfering distance and height ratio depending on the configuration of building.

Interference effects between two tall buildings with different section sizes on wind-induced acceleration

Wind-induced interference effects on the along-wind and across-wind acceleration responses between two tall buildings were detailed studied based on a series of pressure measurement wind tunnel experiments and response analyses. The modifications of acceleration response at the top of principal building from interference over a practical range of reduced velocities were represented by an enveloped interference factor (EIF). In this study, six types of interfering buildings were considered with breadth ratios (Br = 0.4, 0.6, 0.8, 1.0, 1.2 and 1.4) and the influences of approaching turbulence intensity were investigated. Furthermore, the interference mechanism to wake vortex-excited resonance were explored. As a result, amplification effects were mainly dominant not only for along-wind EIFs but also for across-wind EIFs. When Br equaled to 0.4 and 0.6, the maximum along-wind EIFs were 2.3 and 2.1, while the maximum across-wind EIFs were 3.0 and 2.1 because of wake vortex-induced resonance. Whether in along-wind or in across-wind direction, EIFs decreased with the increase in turbulence, and a strong linear correlation was discovered between low and high turbulences for all the breadth ratios. The interference mechanism of wake vortex-induced resonance to acceleration response, base moment response, and torsional response were the same for square section buildings.

珠江新城地区超高层建筑风压分布及风致响应干扰效应研究

珠江新城地区超高层建筑风压分布及风致响应干扰效应研究

Comparison of Wind-Induced Interference Criteria and Effects under Typical Towers-group Arrangements

Interference factors (IFs) are commonly used to envelope various dynamic loading distributions due to wind-induced interference effects. However, those parameters are discrete in values for different evaluation criteria. Aiming at unifying cognitive distinction for series equivalent criteria about IFs, cooling tower groups with typical 6-towers arrangement were selected to conduct case studies by wind tunnel tests and numerical calculation, investigating interference effects among classical rectangular and rhombic arrangement. 25 kinds of IFs' definitions were totally compared basing on three index levels, namely loading, internal force and reinforcement ratio. Wind pressure measurements about 1:200 reduced-scale model were carried out in TJ-3 wind tunnel, corresponding 3D dynamic or static calculation were finished to analyse IFs. Main conclusions can be summarized, such as there are great distinctions about IFs’ value for different criteria, whose maximum may reach 42%, IFs’ variance coefficients in loading level would be the largest, and those in reinforcement level are the smallest, etc.

Wind-induced interference effects on low-rise buildings with gable roof

Previous studies have observed clear interference effects and differences in response from a building group against an isolated building. This study conducted numerical simulations for low-rise buildings under wind load to investigate the mean wind-induced interference effects between the buildings. The primary purpose is to reveal the characteristics of wind pressure distribution on gable roof of low-rise building considering interference effects such that practical wind-resistant design methods and measures can be proposed. Various arrangement modes, arrangement distances and wind direction angles were considered based on the Reynolds Stress Model (RSM) that was verified by a wind tunnel test. The results show that the strongest mean wind-induced interference effects occurred on the cornice of the interfered building for two of the same low-rise buildings. With regard to the arrangement of low-rise buildings, the tandem arrangement yields the largest effects, followed by the staggered arrangement and then the parallel arrangement. For the regular group of low-rise buildings, larger interference effects occurred on the roof of low-rise buildings that were located on the corners or outer parts of the groups.

Analysis of interference effects on torsional moment between two high-rise buildings based on pressure and flow field measurement

Wind induced interference effects between high-rise buildings have become quite important in structural engineering in modern cities recently due to the close proximity of high-rise buildings. In this study, the wind induced interference effects on the torsional load on two adjacent high-rise buildings are studied through wind tunnel experiment. Two different sectional shapes of high-rise buildings are studied and four kinds of arrangements are investigated. Existing interference factors are adopted to quantitatively evaluate the interference effects. Results show that the mean torsion on a building when under interfered conditions can be tripled that for the isolated case. Although the interference effect on the fluctuating torsion is not as strong as on the mean torsion, the interference factor can be as large as 1.6. The extreme torsion under interference effects is also higher at 1.8 times that of the isolated case. With the help of pressure measurement on the principal building and the flow field information around the buildings, the underlying mechanisms of some typical cases which exhibit strong interference effects are discussed. Results show that the intricate flow field around the principal building with the presence of an interfering building is the main case of the large torsion it experiences.

Interference effects on aerodynamic wind forces between two buildings

Wind-induced interference effects on overall wind loads and local wind loads on two buildings were studied in a series of the wind tunnel test on typical tall building models using a pressure measurement technique. In this study, five types of adjacent building models were considered with height ratios (Hr=0.5, 0.7, 1, 1.5 and 2) and wind directions were considered from 0° to 355° in 5° steps. Aerodynamic interference effects on base moments and local wind forces along nine height levels of the principal building are presented and discussed. As a result, interference effects (MIFMD and RIFMD) on along-wind base moment coefficients with Hr=1 and 1.5 significantly increased when the interfering building was close to the principal building. Moreover, when a higher interfering building was located at (X/B, Y/B)=(1.5, 1), mean wind loads and fluctuating wind loads in the along-wind and across-wind directions simultaneously increased. Mean and RMS along-wind local force coefficients at z/H=0.975 were significantly increased when the interfering building was located at (X/B, Y/B)=(1.5, 0). Variations of along-wind and across-wind local force coefficients along the height levels depended on the locations and height ratios of the interfering building.

Analysis of Interference Effects of Adjacent Buildings on Wind Pressures

This paper presents numerical and experimental investigations of wind-induced interference effects on the pressure distributions on an adjacent building. The relative locations of the interfered building model and the interfering model are sited in staggered arrangement. The wind tunnel tests were carried out in a low-speed boundary layer wind tunnel. The numerical predictions for pressure distribution on the principal building are performed by solving the Reynolds-averaged Navier–Stokes (RANS) equations using the renormalization group (RNG) k–e turbulence model and then compared with the measurements. The RANS equations are solved by the pressure correction procedure of the SIMPLEC method. The simulated pressure, base force and base moment coefficients in different wind directions are generally in good agreement with the corresponding wind tunnel data. It is also found that the wind pressures, base forces and moments on the testing building are affected to some extent by the interference from adjacent buildings. The numerical simulation applying the SIMPLEC method using the QUICK upwind scheme and the RNG k–e turbulence model seems to be a useful tool for the predictions of wind pressures, and especially the wind forces acting on a building with an adjacent building.