Types of Curtain Wall Glazing

Nowadays Glass  has  become  a  major  element  in  designing  modern commercial  or  public  buildings.  Load -bearing   structures are wanted to be delicate systems with a transparent feel.  The use of steel in load-bearing structures improves the transparency of facades because it has been possible to keep the load-bearing structure slender. Curtain  wall  meaning  a  set  of  aluminum  profile  like  Mullion, Transom, Glass panel. There are three types of curtain wall.

Above three, we used the unit panel system which is also called as unitized system. This system comes preassembled; it can be pre-glazed at the factory or shop, or glazed on-site. As such, it minimizes field labor and erection costs, and promises a shorter installation period than the stick system. Quality control issues can be significantly reduced in terms  of  site  labor,  especially  with pre-glazed units, but assembly at the plant and transportation (due to bulk) increases its cost. Another disadvantage to preassembly is any site changes become difficult to accommodate.

Assembly must be carried out in a specific sequence to ensure a proper fit. In a unitized system, the manufacturer must rely on qualified installers to ensure that the air seals are properly installed between the split mullions. Nevertheless, the unitized system is the most popular façade system according to on manufacturer and it has performed satisfactorily when installed correctly.

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The Curtain Wall is designed to resist and handle all the imposed loads on it as well as keep air and water from penetrating in the building.  The  loads  imposed  on  the  curtain  wall  are  transferred  to  the  building  structure  through  structural  interface  (i.e.  brackets) which attaches the mullions to the building. The curtain wall is designed for the following Loads.

  1. Dead Load
  2. Wind Load

The  main  aspect  in  designing  steel  and  glass  joints  is  to  consider the special material properties and behavior of glass. Glass fractures brittle without a forewarning.  These  properties  and  behavior  concern  normal  float  glass  as  well  as laminated glass and safety glass.

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