GB/T 38264-2019Classification and test method of resistance against impact for curtain wall (English PDF)

3.1 Resistance against impact

The ability of curtain wall panels, components and their interconnections to resist the impact of soft or hard objects of the specified mass on the indoor or outdoor side without causing damage to human safety. [GB/T 34327-2017, definition 7.7]

3.2 Drop height

5.4.2 Selection of impact points for impact resistance to soft weights

5.4.2.1 General requirements

It may select the location as designated by the client for impact. When the impact resistance level needs to be assessed, the impact point shall be determined in accordance with the requirements of 5.4.2.2, 5.4.2.3, 5.4.2.4, 5.4.2.5.

5.4.2.2 Component glass curtain wall and unit glass curtain wall

For the component glass curtain wall and unit glass curtain wall, it shall determine the impact point according to the following requirements. The height of the impact point on the indoor side from the indoor completed surface shall not be more than 1.1 m:

a) The center of the curtain wall's fixed panel;

b) The center of the open panel;

c) The midpoint of the connection point between the adjacent upper and lower supports of the column;

d) The midpoint of the beam;

e) The point 100 mm above the connection point between the column and the beam (beam surface);

f) The point on the beam 100 mm away from the connection point.

5.4.2.3 Point-supported glass curtain wall

The point of impact of the point-supported glass curtain wall shall be the center of the curtain wall panel; meanwhile the height of the impact point on the indoor side from the indoor completed surface shall not be more than 1.1 m.

5.4.2.4 All-glass curtain wall

The impact point of the all-glass curtain wall shall be the center of the curtain wall panel; the height of the impact point on the indoor side from the indoor completed surface shall not be more than 1.1 m.

5.4.2.5

Stone curtain wall, metal plate curtain wall, artificial plate curtain wall The outdoor impact point of stone curtain wall, metal plate curtain wall and artificial plate curtain wall shall be the center of curtain wall panel.

5.4.3 Selection of impact points for impact resistance test of hard objects

It may select the location as designated by the client to make impact, which shall include the center point of the curtain wall panel.

5.4.4 Testing steps for impact resistance of soft weights and impact

resistance of hard objects The testing shall follow the steps below:

a) Suspend an impact object. The geometric center of the soft weight shall be within the circular range of the curtain wall facade with the impact point as the center of the circle and a radius of 50 mm. The geometric center of the hard weight shall be within the circular range of the curtain wall facade with the impact point as the center of the circle and a radius of 25 mm.

b) Lift the impact object so that its center reaches the specified drop height.

The drop height's error is ± 20 mm. The horizontal angle between the hanging wire rope and the horizontal plane of the suspension point should not be less than 14°. Keep the centerline of the impact object and the hanging wire rope centerline on the same straight line.

c) Release the impact object. Let it fall freely and hit the impact point once.

d) Tighten the impact object immediately after one impact, to avoid repeated impacts.

e) Observe and record the condition of the test piece.

5.5 Judgment of results

5.5.1 Impact resistance to soft weights

One of the following situations shall be judged as unqualified:

a) The panel comes off, is broken or cracked;

b) Decorative strips or other attachments have come off.

5.5.2 Impact resistance to hard object

Panel's failure, break or cracking shall be determined as unqualified.