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Effects of internal angle between limbs of “Y” plan shaped tall building under wind load
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.jobe.2020.101843
Prasenjit Sanyal , Sujit Kumar Dalui

Y plan shaped building is usually a triaxially symmetrical building where three separate limbs are bridged in a central core portion. Due to some engineering or architectural requirements, the symmetricity among the wings is not maintained properly, and the limb angle modification is unavoidable. This paper demonstrates a comprehensive study on mean pressure, force and moment coefficients of different types of “Y” plan shaped tall buildings by varying the internal angles between limbs by 30º for various Wind incidence angles (WIAs) from 0º to 180º at an interval of 30º. To maintain the same plan area, the limb sizes are slightly changed accordingly. Numerical analysis has been carried out to generate a similar type of flow condition as per terrain category II of IS:875 (Part 3) –2015. ANSYS CFX is used for the simulation. For validation of the present computational setup, a graphical comparison is made on the Commonwealth Advisory Aeronautical Research Council (CAARC) building model. Some previous wind tunnel results on “Y” shaped building are also compared with our numerical data. The distribution of pressure over the surfaces, mean pressure coefficients and force coefficients are evaluated for each “Y” type building model, and the results are represented graphically to understand the extent of nonconformities due to such angular modifications in the plan. Finally, Fourier expressions of WIA are proposed for obtaining force and moment coefficients for different building models. The accuracies of the fitted models are measured by R2 value.



中文翻译:

风荷载作用下“ Y”形高层建筑四肢间内角的影响

Y平面形状的建筑物通常是三轴对称的建筑物,其中三个独立的肢体桥接在中心核心部分。由于某些工程或建筑要求,机翼之间的对称性不能适当保持,并且不可避免地要改变肢体角度。本文展示了对不同类型“ Y”形高层建筑的平均压力,力和弯矩系数的综合研究,通过将肢体的内角从0º到180º的各种风入射角(WIA)间隔30°改变30º 30º。为了保持相同的平面面积,相应地改变了肢体的大小。根据IS:875(第3部分)-2015年的地形II类,已经进行了数值分析,以生成相似类型的流动条件。ANSYS CFX用于仿真。为了验证当前的计算设置,在联邦咨询航空研究委员会(CAARC)的建筑模型上进行了图形比较。以前在“ Y”形建筑上风洞的一些结果也与我们的数值数据进行了比较。对每个“ Y”型建筑模型评估表面上的压力分布,平均压力系数和力系数,并以图形方式表示结果,以了解平面图中此类角度修改所导致的不合格程度。最后,提出了WIA的傅里叶表达式,以获取不同建筑模型的力和力矩系数。拟合模型的精度通过 在英联邦航空咨询委员会(CAARC)的建造模型上进行了图形比较。以前在“ Y”形建筑上风洞的一些结果也与我们的数值数据进行了比较。对每个“ Y”型建筑模型评估表面上的压力分布,平均压力系数和力系数,并以图形方式表示结果,以了解平面图中此类角度修改所导致的不合格程度。最后,提出了WIA的傅里叶表达式,以获取不同建筑模型的力和力矩系数。拟合模型的精度通过 在英联邦航空咨询委员会(CAARC)的建造模型上进行了图形比较。以前在“ Y”形建筑上风洞的一些结果也与我们的数值数据进行了比较。对每个“ Y”型建筑模型评估表面上的压力分布,平均压力系数和力系数,并以图形方式表示结果,以了解平面图中此类角度修改所导致的不合格程度。最后,提出了WIA的傅里叶表达式,以获取不同建筑模型的力和力矩系数。拟合模型的精度通过 对每个“ Y”型建筑模型评估平均压力系数和力系数,并以图形方式表示结果,以了解平面图中此类角度修改所导致的不合格程度。最后,提出了WIA的傅里叶表达式,以获取不同建筑模型的力和力矩系数。拟合模型的精度通过 对每个“ Y”型建筑模型评估平均压力系数和力系数,并以图形方式表示结果,以了解平面图中此类角度修改所导致的不合格程度。最后,提出了WIA的傅里叶表达式,以获取不同建筑模型的力和力矩系数。拟合模型的精度通过R 2值。

更新日期:2020-09-25
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