Investigation of wind load on 1,000 m-high super-tall buildings based on HFFB tests

Abstract

Summary This paper studies the wind load on 1,000 m‐high super‐tall buildings and provides basic reference for design, including the utilization of passive and active control devices. High‐frequency force balance wind tunnel tests of super‐tall buildings with different height are carried out to investigate the effects of building height and wind flow on the wind load. Both monsoon and typhoon climate wind flows are simulated based on target models suggested in literatures. The simulation of typhoon climate wind flows is carried out by a newly developed technique. The analysis of the experimental results confirms that the aerodynamic force is very sensitive to both building height and wind flow. In monsoon climate, the turbulence intensity decreases on increasing the height above ground. Thus, on increasing the building height, vortex shedding becomes increasingly intense and excites stronger structural vibrations in the across‐wind direction, though the across‐wind fluctuating overturning moment coefficient is almost the same. In typhoon climate, both the mean and the fluctuating overturning moment coefficients increase with the building height. This is mainly caused by the decreasing mean wind speed. The vortex excitation becomes weaker on increasing the building height, and this phenomenon is different from that observed in the monsoon climate. In order to better explain vortex‐shedding excitation, a new parameter referred to as the characteristic turbulence intensity is defined herein as a weighted mean value of the turbulence intensity in the range of the building height. It provides a robust interpretation of the vortex excitation of super‐tall buildings located in different wind flow and climate conditions.

CFD simulation of wind loads of kilometer‐scale super tall buildings with typical configurations in veering wind field

“…Liu et al 9,10 successfully simulated two veering wind fields in a wind tunnel and then investigated the wind loads of a super tall building with a square section and an aspect ratio around 6:1 in the veering wind fields. However, previous studies have pointed out that the aspect ratios of kilometer‐scale super tall buildings should be at least 8–10, 11 so the test results of Liu et al 9,10 may be unsuitable to the design of kilometer‐scale super tall buildings. Recently, Feng et al 12 and Feng and Gu 13 numerically simulated the wind loads of a kilometer‐scale super tall building with a square section and an aspect ratio of 9:1 in veering wind fields based on the large eddy simulation (LES) method.…”

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

“…These skyscrapers have widely adopted innovative architectural materials, structural systems and construction techniques and are characterized by low structural damping, light weight, and high flexibility, making them susceptible to wind loads (Isyumov et al, 1992;Kwok et al, 2009;Tamura and Suganuma, 1996). To evaluate wind loads for high-rise buildings and structures, especially during the initial stages of wind-resistant design, wind tunnel tests remain the primary method, and common engineering practices include the following two methods: the high-frequency force balance technique (HFFB) and the synchronized multipressure sensing system (SMPSS) (Frison et al, 2021;Gu and Quan, 2004;Kim and Kanda, 2010;Li et al, 2018;Lin et al, 2005;Tanaka et al, 2012;Tschanz and Davenport, 1983;Tse et al, 2009;Xie and Irwin, 1998;Zeng et al, 2023;Zhou et al, 2022). Only the prototypical aerodynamic shape needs to be simulated accordingly in the two approaches, and the wind loads can be obtained through direct measurement or integration.…”