Purlins are used to support the steel panels in the roof of a building. They are also used to provide lateral support to girders. The use of purlins means that the thickness of floors, the dimensions of steel girders and size of supporting pillars can be minimizing. This in turn means that the height of a building and the space that it requires can be reduced. Thus, the use of purlins allows for more actual space to be used in a buidling. In addition to this, the use of purlins can also lead to savings on the un-necessary provision of heating and air conditioning. The light structure reduces the load on foundation of the building and is able to reduce the cost of foundations. Compared to traditional reinforced concrete structures, steel structure can effectively shorten construction times and control the quality of construction.
1) Base material with undercoat on both sides. Its minimal yield strength is 345 Mpa, which is in line with national standards for Q345 Steel.
2) The surfaces of the base material are successively treated with hot-dip galvanization. This meets ASTM A252M Z275 standards with nominal the amount of galvanization being 275G/M2. The minimal yield strength is 3, 510G/M2, which meets the ASTM A446M Grade D stipulations.
3) The hot-dip galvanization treatment on surface of the base material (Zinc - 5% aluminum) is in line with the regulations set by ASTM A875M ZGF275. The nominal amount of galvanization is 275G/M2, and the minimal yield strength is 3, 510G/M2, which meets the ASTM A446M Grade D stipulations.