Key points of the wind tunnel test for urban sculptures

The purpose of the wind - induced vibration experiment of urban sculptures is to study the overall aerodynamic force changes of the statue model under different wind direction angles, as well as the pressure distribution on the model surface. Then, determine the wind - load conversion shape coefficient of the structure, which provides an important basis for the calculation and analysis of the structure under wind loads.

Here, we take the stone statue project of Zheng Chenggong with a height of 78m in Xiamen, Fujian as an example to briefly introduce the wind - tunnel test process of large - scale statue structures. After the wind - tunnel test model of this project was scaled down proportionally, the test equipment and model were tested in the low - speed unsteady wind tunnel of the Aerodynamics Research Institute of Nanjing University of Aeronautics and Astronautics in July 2012.

(1) Test wind tunnel

The wind - pressure test of the Zheng Chenggong statue model in Xiamen is carried out in a low - turbulence, low - noise, unsteady return - type low - speed wind tunnel. The test section is open. The main technical indicators of the unsteady wind - tunnel test section are: width × height × length 11.0m × 1.7m

The maximum wind speed at the opening is 45m/s, closed

The airflow deflection angle: pitch direction (△yaw direction |≤ 0.5°

(2) Test

The test model is made of resin at a scale of 1:100.

(3) Force measurement

The aerodynamic force of the balance test model is measured by a six - component box - type balance. The appearance of the balance is shown in Figure 2.7. The load - bearing capacity and static calibration index performance of the balance.

(4) Pressure measurement system

The pressure distribution on the model is collected by a pressure scanning valve. The range of the pressure scanning valve is 254mmH₂O

(5) Data acquisition and processing system

The data acquisition and processing system used in the test consists of an amplifier, a data acquisition card, and a computer. The sampling speed of this system can reach up to 40000 points/s, and the acquisition accuracy is 0.1% of the full scale.