首页 朱明之关于建筑-公众号 笔记《英标/欧标-CFS系统耐久性能》



If you’re unfamiliar with cold-formed steel (CFS) framing or simply haven’t used it in a while, you may have several questions: What is it? How can I use it? Why should I use it? CFS certainly isn’t a new building material. It actually has been used in North America for over 100 years. Because of its light weight and durability, it can be used in a range of applications — from interior, non-loadbearing partition walls to structural members in mid-rise and multi-family buildings. Whatever your current level of knowledge, consider this eBook a primer on all things CFS framing. In it, you’ll learn what CFS is, how it can benefit a construction project, the basics of designing with and ordering CFS, and training options for expanding your CFS knowledge.
Because Cold-formed steel (CFS) framing is light weight, extremely strong, noncombustible, and relatively easy to install, it has dominated the market for interior, non-loadbearing partition walls in commercial construction.  Now, with advanced technological developments like panelized systems, the building community is using CFS for structural applications in mid-rise and multi-housing buildings.
In fact, cold-formed steel framing is rapidly becoming the material of choice for student dormitories, assisted living facilities, and hotels across the country where prudent developers are interested in maximizing their return on investment.

What is cold-formed steel?

Cold-formed steel (CFS) members are made from structural quality sheet steel that are formed into C-sections and other shapes by roll forming the steel through a series of dies. No heat is required to form the shapes (unlike hot-rolled steel), hence the name cold-formed steel. A variety of steel thicknesses are available to meet a wide range of structural and non-structural applications.

Value-benefit of steel

CFS as a construction material has many advantages. For example, CFS doesn’t shrink or split, won’t absorb moisture, and resists warping, termites, and fire.
As a uniformly manufactured product, the quality of CFS is very consistent. That consistency translates into less scrap to haul off because there is less waste — all of it recyclable. In addition to lowering scrap disposal expense, the fire resistance of CFS framing also can help reduce project costs through discounts on builders’ risk and other course of construction insurance requirements.
CFS’ physical properties allow it to be used in a wide range of environments. It’s strength and ductility, for example, make it ideal for construction in regions subject to high winds or earthquakes. Moreover, a study, conducted by the National Association of Home Builders (NAHB) Research Center, showed that the zinc coating on steel framing materials can protect against corrosion for hundreds of years.
And because each piece of CFS contains a minimum of 25 percent recycled content, is 100 percent recyclable at the end of its lifespan, and emits no volatile organic compounds — it’s an exceptionally sustainable building material.

On the jobsite

CFS also provides numerous advantages in terms of the construction process itself. CFS is light making it easy to ship, handle and assemble.
Moreover, greater strength means less material. For example, if a project calls for stick framing, the strength of CFS allows it to be installed on 24” centers rather than traditional 16” centers — meaning fewer studs to install.
And because CFS is manufactured to exacting standards, it is ideally suited for manufacturing into panels and trusses which — because CFS is light in weight — can be quickly and easily installed with fewer framers on the job.
Given those advantages, some builders have found that ordering factory-manufactured steel panels and trusses is an ideal way to move into steel framing because it minimizes the need for skilled framers, and provides access to experienced design and layout pros.
In addition to speeding up the framing process, CFS panels contain pre-punched holes designed to accommodate rapid mechanical, electric and plumbing installation after the framing is complete.

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作者: ganggouren



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