# Effects of Corner Modification on the Wind-Induced Responses of High-Rise Buildings
## 1 Introduction
[PERSON] et al. [12] studied the influence of recession, chamfering, and roundness on the aerodynamic characteristics of high-rise buildings via the aeroelastic wind tunnel test. They obtained the base forces and power spectra in the along wind and cross-wind directions under different wind speeds. They found that a minor degree of chamfering apparently reduces the base forces compared with the original square section. [PERSON] et al. [13] identified the aerodynamic damping ratio via aeroelastic tests on ten high-rise buildings and explored the influence of chamfering and recession on the ratio. They stated that the aerodynamic damping ratio increased with the increase in the modification ratio. [PERSON] et al. [14] studied the influence of recession and roundness rates on the wind-induced vibration responses through aeroelastic tests and obtained the cross-wind displacement atop the building. They declared that the recession rates in the range of 7.5-10% could significantly attenuate the displacements around critical wind speed but increase the \(St\) of buildings, leading to the vortex-induced vibration of structures at a lower wind speed. [PERSON] et al. [15] conducted CFD simulations on the building with 10% chamfering and recession measures on the section. They found that chamfering actions would better mitigate the drag coefficients than the recession measure. [PERSON] et al. [16] combined a genetic algorithm and an artificial neural network to study the optimal section shape of different corner parameters such as the convex and concave degrees. [PERSON] et al. [17] used the multi-assurance proxy model to give the optimal solution for various cross-section profile parameters. In their work, a large number of CFD data proxy models with fast calculation under different section conditions were utilized to find the optimal solution with the optimization algorithm. [PERSON] [18] used the agent model combined with the optimization method of NSGA-2 to study the wind effect of convexity and concavity of building sections on wind-induced response. He found that the convexity of the building makes the building shape more streamlined and suppresses the intensity of vortex shedding. [PERSON] et al. [19] presented a data-driven adaptive control strategy that continuously seeks to minimize wind-induced vibration for a given average flow condition via CFD technique. However, the CFD simulation is closely related to the turbulence model in the pretreatment process. Thus, its accuracy still requires further confirmation by the physical meanings, such as the wind tunnel test [20]. The above studies are shown in Table 1, in which the roundness, chamfering, and recession are denoted as \"RO\", \"CH\", and \"RE\", respectively, for the purpose of simplicity. Most studies mentioned above primarily focused on corner modifications, and there is no definite answer to the optimal solution for corner modifications. The optimal aerodynamic modification of a high-rise building may vary due to the section shape and surrounding buildings, etc. During the design stage of an actual building, a specific analysis addressing the aerodynamic optimization issue may be necessary providing a high-rise building with remarkable height. In the actual engineering projects, except for the building shape, the local factors, such as nearby interference buildings, terrain conditions, and design wind speed, will also have additional effects on the wind load and wind-induced response of the high-rise buildings, and therefore the determination of the aerodynamic modification measure. Furthermore, for a high-rise building with remarkable height, a SPI test on the building may also be applied to determine the wind loads on the building, components, and cladding; therefore, the comparison between the results of the HFFB and SPI tests can be completed so as to verify the effect of aerodynamic modification measure.