If the wind load standard value proposed by the testing commission is low, the water-tightness design value calculated from this is lower than 1000Pa(tropical storm prone area) or 700Pa(other areas), and on the premise that the specimen structure and material can ensure safety, The watertight performance of the fixed part of custom curtain wall is tested at least 100OPa(tropical storm prone area) or 700Pa(other areas). This has its necessity: the watertight performance has a great influence on the normal use of curtain wall, and once the leakage is difficult to repair (especially the unit curtain wall), so the requirement should not be too low; It is also possible that the curtain wall has a margin for wind resistance design.
The watertight performance of the open part is required to be no lower than the index level of the fixed part. The open part should not only have the performance of normal opening and closing, but also should bear the function of ventilation and shelter when necessary. Therefore, it is more difficult to prevent rainwater leakage than the fixed part of the window sash that can be opened. National standard for open part and fixed part of the rainwater leakage performance requirements are also different - the same level and open part of the index of the wind pressure value is different. From a large number of detection and on-site inspection, many modern curtain walls of the upper suspension window design level is low, poor quality of component processing, improper installation, rainwater leakage is quite common. In this situation, the open part of rainwater leakage performance detection index should not be set too low, the minimum value of 250Pa.
The limit of inter-layer displacement Angle is the ratio of the limit of left and right displacement in the curtain wall panel to the height of the curtain wall. When the design is not aseismic, it should be designed according to the displacement Angle limit of elastic layer of the main structure. In seismic design, the displacement Angle between elastic layers of the main structure should be three times of the limit value. Similar to the wind performance situation, a large number of clients do not know much about this. The factors affecting the in-plane deformation performance include curtain wall structure, material and joint structure. The deformation in the plane will cause the distortion and extrusion between the structure and the plate. The curtain wall construction filled with sealant is more conducive to reducing the rigid contact between the panel and the frame, hardware, etc., so as to weaken the destructive deformation.
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Post time: Oct-11-2022
