Physical performance test of building curtain wall

The detection index reflects the requirements of the performance of the curtain wall building. In fact, a certain detection index should be the corresponding performance index of the curtain wall. Physical performance indicators are particularly important. The standard curtain wall design scheme should put forward a clear and appropriate index. However, in the face of a considerable number of entrusting parties who do not know much about the technical requirements of the curtain wall, the testing party is responsible to provide hints and suggestions to the entrusting party from the perspective of technical responsibility for the consideration of ensuring the testing quality, so as to help determine reasonable testing indexes.

The design of wind pressure
This index and other performance indicators have an obvious difference: although the NATIONAL standard also has grading standards, but for the detection of the vast majority of engineering detection, it is important to specific engineering design indicators. According to the current code, the wind load standard value WK is the lower limit of wind pressure corresponding to the limit value of flexure grotto. The wind pressure index of engineering inspection must be clear because of the requirement of engineering acceptance. The testing personnel should master the calculation and value method of the designed wind pressure, but should not determine the index on behalf of the entrusting party. Many curtain wall projects have not determined or put forward the standard value of wind load in the design stage, which cannot be avoided in the commissioning test stage. It plays an irreplaceable role in perfecting design and controlling degree.

Under the action of a certain curtain wall glazing in a certain place, the distribution of wind pressure in different heights and different parts of the building has a variety of circumstances. Generally speaking, when there is no or less wind interference from other buildings (or other objects) around, the wind pressure at the upper part of the building is greater than that at the lower part; The wind pressure in the corner area of the building is greater than the wind pressure on the wall. Many parts of the leeward or crosswind side often appear negative pressure, windward side is generally positive pressure; Maximum negative wind pressure is higher than maximum positive wind pressure. Only from this small part with the regularity of the summary can be thought: in the building curtain wall wind resistance design, we should try to consider the complexity of the whole building surface wind pressure distribution, and the whole curtain wall frame to adopt a standard value of wind load, it is obvious simplification. Because the standard value of single wind load is generally high on the whole and low on the local, this approach often leads to the curtain wall or other kinds of envelope designed in this way is too conservative in most locations (resulting in material waste), and the wind resistance performance is low in some locations.