What is the difference between cold-formed section steel and traditional building materials
Today, Xiaobian will introduce the difference between cold-formed steel and traditional building materials, hoping to help you.
(1) Cold formed section steel has light weight and saves steel. After cold processing, the cold bending effect appears in the bending area of cold-formed section steel, which improves the strength. Compared with the hot-rolled section steel with the same area, the rotation radius of cold-formed thin-walled section steel can be increased by more than 50%, and its moment of inertia can be increased by about 50% ～ 180%. Under the same load, the steel can be saved by about 10% ～ 25% compared with the hot-rolled section steel. The self weight of cold-formed section steel is light. On the premise of completing the same function, the mass is only 1 / 8 ~ 1 / 10 of concrete structure and 1 / 2 ~ 1 / 3 of ordinary steel structure.
(2) The structure has good integrity, safety and reliability, and good seismic performance. The roof truss, wallboard and foundation of cold-formed steel houses are firmly connected. For such structural houses, especially when the wallboard is attached with OSB board, gypsum board or corrugated board, strong skin effect shall be considered, so that the actual stress and deformation of components are reduced by about 10% ~ 15% compared with those in plane system design, which can be used as the safety reserve of the house. Due to the light weight of cold-formed section steel, the seismic action in the design can not be controlled.
(3) The residual stress and connection mode of cold-formed section steel members are different from those of hot-rolled section steel. The residual stress of cold-formed section steel is formed by bending at room temperature, while the residual stress of hot-rolled section steel is mainly caused by the uneven shrinkage deformation caused by uneven cooling. Their distribution and influence are different. Hot rolled section steel members are mainly connected by welding and bolts, while cold-formed section steel members are less used because of high technical requirements for sheet welding and damage to the zinc coating. The welding forms include horn welding and resistance spot welding. Zinc coated cold-formed thin-walled section steel mainly adopts self tapping and self drilling screws, rivets and other connection methods, and cold-formed section steel and profiled steel plates are also mechanically connected without connectors (such as bite and buckle connection).
(4) The industrial production of building structure can be realized, and the production cycle is short. Cold formed thin-walled components can basically realize factory standardized production, ensure their stable and reliable quality, and help to reduce costs. Site splicing and installation, convenient installation, fast construction speed, high precision, and not limited by season. For example, the construction period of 30m2 wall is only 1 / 8 of that of concrete wall. With the characteristics of short construction cycle and fast investment recovery, it can effectively reduce the capital pressure of early investment and is welcomed by the majority of owners.
(5) The house has beautiful appearance, flexible space layout, large use space and good comprehensive economic benefits. Cold formed steel houses can be made into color roofs and color walls with various slopes according to demand, with bright and lasting colors and beautiful architectural shape. Building space division is flexible. The component has high bearing capacity and small cross-sectional area, which can increase the service space by 5% ~ 10% compared with the concrete structure house. The material is not aging, combustion supporting, mildew, moth eaten and less maintenance. The basic cost of cold-formed steel house is close to that of concrete house, but considering the relevant factors such as foundation cost and service space, its comprehensive economic benefit is better than that of concrete structure.
