Comparison of aerodynamic coefficients of setback tall buildings due to wind load

Bairagi, Amlan Kumar; Dalui, Sujit Kumar

doi:10.1007/s42107-018-0018-3

Cited by 38 publications

(10 citation statements)

References 13 publications

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“…ANSYS Fluent software was used to create a computational domain around the 3-D geometry of the building. Different dimensions for the computational domain have been used depending on the scale of the model and conditions [46][47][48]. Figure 3 shows the benckmark model inside the computational domain.…”

Section: Computational Domain Set-upmentioning

confidence: 99%

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Analysis of aerodynamics around tall buildings with several configurations

Al-Saadi

2022

QJES

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The streamlined exterior shapes of tall buildings are important to reduce the effect of the wind. Therefore, an examination of different techniques for the exterior design of tall buildings is required. This study aims to analyses some tall buildings to select the most streamlined design in order to reduce high wind risks. The benchmark used in the current study is a building with a height of 120 m and a triangular cross-section with a side length of 20 m. A square cross-section twisted building design is used as a modified model in tall buildings of about 120 m. The rotation angle of the building is 45° for each twisted path. Six configurations of this type of building are tested with different radiuses of fillet on their edges, which are 0, 1, 2, 3, 4, and 5 m respectively. All geometries of the buildings are created by SolidWorks, while mesh and simulations are achieved using ANSYS Fluent. Great agreement is obtained between the current results and the previous related study for the benchmark. Using twisted buildings with a fillet of 5 m can lead to a reduction of the drag coefficient of about 27.5% relative to the benchmark. Wind in a horizontal direction can be reduced by using twisted geometry. But in terms of separation, using a fillet with a large radius can lead to avoid early separation of air.

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Section: Computational Domain Set-upmentioning

confidence: 99%

“…Figure 3 shows the benckmark model inside the computational domain. Recommended dimensions by Bairagi and Dalui [48] were used in the current study. The distance from the inlet to the tested model was five times the building's height.…”

Section: Computational Domain Set-upmentioning

confidence: 99%

Analysis of aerodynamics around tall buildings with several configurations

Al-Saadi

2022

QJES

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“…However, Bairagi and Dalui [14] investigated the effect of building configuration for wind distribution on square and setback building forms, and the setback form developed an excessive suction pressure at the top of the roof in comparison to the square model. Another study by the same authors [15] investigated the impact of single-side and both-side setback, where the latter was noticed to be more susceptible to wind motions. Large openings and through-building gaps were also considered among major modification options due to its effectiveness in reducing across-wind excitation as a result of the organized or narrow-band vortex-shedding process [16].…”

Section: Introductionmentioning

confidence: 99%

Computational Aerodynamic Optimization of Wind-Sensitive Irregular Tall Buildings

et al. 2022

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Wind-induced loads and motions play a critical role in designing tall buildings and their lateral structural systems. Building configuration represented by its outer shape is a key parameter in determining these loads and structural responses. However, contemporary architecture trends towards creating taller buildings with more complex geometrical shapes to offer unique designs that become a signature on the map of the world. As a result, evaluating wind-induced motions on such structures becomes more challenging to be evaluated and predicted. This paper presents a computational performance-based aerodynamic optimization with minor imposed modifications that have little to no impact on architectural and structural design intent. The developed tool aims to assist both architects and engineers to seek a sustainable optimal design decision at the early stage of design by employing different computational technological tools in an automated manner. A computational optimization methodology consisting of a computational fluid dynamic coupled with finite element analysis and embedded within a radial basis function surrogate model is proposed to mitigate wind-induced loads on tall buildings. In addition, a numerical example implementing the proposed methodology on selected case study is presented and discussed. The proposed approach was able to achieve a minimization of 13.83% and 23.12% for along-wind and across-wind loads, respectively, which is translated to a reduction in structural response by 12.95% and 14.31% in maximum deflection for along-wind and across-wind directions, respectively.

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“…Because building shapes plays critical role in deriving its aerodynamic characters, modification of tall building forms proved to be effective in mitigating wind-induced loads on tall buildings (Xie, 2014;Elshaer et al, 2017). Several studies investigated different aerodynamic modifications on tall buildings including major modifications such as tapering, twisting and setback (Kim and You, 2002;Kim et al, 2008;Xie, 2014;Bairagi and Dalui, 2018) that have a significant impact architecturally and structurally on building design, or minor modifications such as corner configuration (Zhengwei et al, 2012;Li et al, 2018;Thordal et al, 2020;Mandal et al, 2021), where it has little to no effect on the intent design, yet still shows an effective results in reducing wind responses. While Kim and You (Kim and You, 2002) and Xie (Xie, 2014) found that tapering is more effective in mitigating across-wind responses, Xie (Xie, 2014) further explored twisting shape modification demonstrating that it has and extra advantage of equalizing winds distribution and responses along wind directions.…”

Section: Introductionmentioning

confidence: 99%

Wind-resistant structural optimization of irregular tall building using CFD and improved genetic algorithm for sustainable and cost-effective design

et al. 2022

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Tall buildings with irregular shapes and considerable heights are gaining popularity in creating the vertical cities around the world. They also considered one of the major energy consumers with little regards to sustainability. Tall building is wind-sensitive structure and shape plays major role in determining wind loads, which usually govern the design of its lateral resisting system. Thus, evaluating wind loads properly and designing an optimal lateral system accordingly are the main challenges attributed to the design process of irregular tall building. This paper presents a computational procedure for the optimal design of wind-resistant irregular tall building to minimize the total weight of structure within design requirements in single digital environment. That is achieved firstly by creating a digital system of computational fluid dynamic (CFD) analysis that is coupled with pressure-load translation (PLT) algorithm to evaluate the wind motions on irregular tall buildings and generate the design wind loads accordingly. Genetic Algorithm (GA) with enhance design constrains function of lateral displacements, inter-story drifts and top acceleration is then developed to perform structural optimization. A numerical example using 70-story twisting reinforced concrete building is implemented to verify the feasibility of the developed computational procedures. Steady and incompressible flow applied at (0°) angle of attack was implemented in the CFD model to simulate the wind flow on the studied building. Genetic algorithm with improved design constraints of static and dynamic design requirements was developed to optimize the structure effectively and efficiently. The numerical example demonstrates its effectiveness by achieving 35.71% reduction of concrete volume from the original lateral structural system design. This is also translated into a sustainability value by lessening the embedded carbon dioxide by 4,400 tons.

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Comparison of aerodynamic coefficients of setback tall buildings due to wind load

Cited by 38 publications

References 13 publications

Analysis of aerodynamics around tall buildings with several configurations

Analysis of aerodynamics around tall buildings with several configurations

Computational Aerodynamic Optimization of Wind-Sensitive Irregular Tall Buildings

Wind-resistant structural optimization of irregular tall building using CFD and improved genetic algorithm for sustainable and cost-effective design

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