The internal pressure response test of the perforated building was completed in the TJ-2 Atmospheric Boundary Layer Wind Tunnel of the State Key Laboratory of Civil Engineering Disaster Prevention, School of Civil Engineering, Tongji University. The TJ-2 Atmospheric Boundary Layer Wind Tunnel is a closed loop rectangular section wind tunnel. In the study of internal pressure of perforated structures, the TTU (Texas TechUniversity) building model from the Wind Engineering Research Laboratory at Texas Tech University in the United States has a wide range of applications. Many researchers have used this building as a prototype to study the wind induced internal pressure of perforated structures. Therefore, this article also uses the TTU model as the building prototype for rigid wind tunnel tests. The experimental model has a length of 548 mm, a width of 364 mm, a height of 160 mm, and a scale ratio of 1:25.

The model is made of double-layer organic glass plates, and the pressure measuring pipeline is arranged in the middle of the double-layer plates to reduce the interference of the pressure measuring pipeline on the internal pressure of the structure under the action of incoming flow. The thickness of the double layer board is 10 mm, so the internal length of the model is 528 mm, width is 344 mm, height is 150 mm, and the internal volume is 0 027m3. The main openings are arranged on the windward side of the model, and different sizes of openings can be simulated by disassembling and replacing different windward sides. The wind direction angle of the wind tunnel test is 0 ° when the flow is perpendicular to the wall of the opening, and the counterclockwise direction is the positive wind direction angle, as shown in Figure 2 According to symmetry, the range of wind direction angle for the test is taken from 0 ° to 180 °, with intervals of 10 °. 20 internal pressure measurement points are arranged on the roof, 15 on the left and right walls, 12 on the leeward side, and 22 or 20 on the windward side according to the size of the openings. Among them, the 8 measuring points located around the opening are double-sided measuring points for internal and external pressure. The purpose is to analyze the correlation between the external wind pressure around the opening and the internal pressure of the opening structure. The internal and external wind pressure meets the requirements of synchronous measurement. The layout of the measuring points is shown in Figure 3. In order to study the effect of opening area (opening ratio) on internal pressure response, four types of square openings with different areas located at the center of the windward surface were set up, with side lengths of 31, 53, 68, and 81 mm, respectively. The corresponding opening ratio (ratio of opening area to opening wall area) was 0 017, 0.048, 0 079 and 0.112