GB/T 37825-2019Test method for simulating wind pressure resistance of building glass under the uniform static loads (English PDF)

3.1 Coefficient of variation

The ratio of the standard deviation of the damage load to the average damage load, which is used to indicate the degree of dispersion of the test value of damage load.

3.2 Equivalent design load

The design wind pressure value as provided by the design department. strength and stiffness, to meet the requirements of not causing excessive deformation or damage during the test. At least one static pressure gauge on the test chamber is used to measure the air pressure in the chamber. The static pressure gauge shall be placed at the position that is least affected by air flow when measuring pressure. The air supply port shall be set properly so that the air flow cannot directly impact the glass specimen. The test chamber shall have a device that can adjust the size of the airflow and facilitate the observation of the deformation of the glass specimen.

5.3 Air supply system

The air supply system includes controllable fans, compressed air sources, exhaust systems, reversible fans or other devices, which shall be able to control the load imposed on the glass specimen as required.

5.4 Pressure measuring device

It can continuously and accurately record the air pressure in the test chamber with an accuracy of ± 2%.

5.5 Thermometer

Measure the ambient temperature, with an accuracy of ± 0.5 °C.

5.6 Hygrometer

Measure the relative humidity of the environment, with an accuracy of ± 2%.

5.7 Safety system

The safety system shall ensure that when the glass is broken, it can protect the on-site inspection personnel and prevent the broken glass from splashing and hurting people.

A.1 Test frame

The test frame is composed of a structural support system and a glass assembly system. The test frame shall be able to support rectangular glass specimens; it shall be ensured that the glass specimens can bear the load perpendicular to its plane.

A.2 Structural support system

As shown in Figure A.1, the size tolerance of the long side alpha and the short side b of the structural support frame is ± 1.6 mm. The width of the edge protrusion of the channel steel used in the structural support system shall not be less than 44 mm. The schematic diagram is as shown in the A-A section in Figure A.1.

The deformation of each component of the structural support system shall meet the following requirements:

a) The maximum lateral displacement relative to the plane of the glass specimen shall not exceed L/750, wherein L is the length of the short side of the glass specimen;

b) The maximum rotation angle of the frame shall not exceed 1°;

c) The maximum in-plane deformation relative to the glass specimen shall not exceed L/2000;

d) The four corners of the frame shall be fastened to minimize slippage or distortion during the test;

e) The maximum deviation from the plane of the butt joints at the corners of the frame shall not exceed 0.4 mm, as shown in the schematic diagram of the A-A section in Figure A.1;

f) The maximum in-plane warpage of the outer end surface of the frame shall not exceed 1.6 mm;

g) The maximum deviation of the diagonal of the rectangular opening in the frame shall not exceed 3.2 mm;

h) The frame shall ensure that the lateral deformation of the glass specimen is not hindered. […]