What is Pre-Engineered Building ?
The scientific-sounding term pre-engineered buildings came into being in the 1960s. The buildings were pre-engineered because, like their ancestors, they relied upon standard engineering designs for a limited number of off-the-shelf configurations. Several factors made this period significant for the history of metal buildings.
First, the improving technology was constantly expanding the maximum clear span capabilities of metal buildings. The first rigid-frame buildings introduced in the late 1940s could span only 40 ft. In a few years, 50, 60 and 70-ft buildings became possible. By the late 1950s, rigid frames with 100-ft spans were made, ribbed metal panels became available, allowing the buildings to look different from the old tried corrugated appearance.
Collared panels were introduced by Strand-Steel Corp. in the early 1960s, permitting some design individuality. At about the same time, continuous span cold-formed Z purling was invented (also by Strand Steel), the first factory-insulated panels were developed by Butler, and the first UL-approved metal roof appeared on the market.1st And last, but not least, the first computer-designed metal buildings also made their debut in the early 1960s. With the advent of computerization, the design possibilities became almost limitless. All these factors combined to produce a new metal building boom in the late 1950s and early 1960s.
As long as the purchaser could be restricted to standard designs, the buildings could be properly called pre-engineered. Once the industry started to offer custom designed metal buildings to fill the particular needs of each client, the name pre-engineered building became somewhat of a misnomer. In addition, this term was uncomfortably close to and easily confused with, the unsophisticated prefabricated buildings, with which the new industry did not want to be associated. Despite the
fact that the term pre-engineered buildings is still widely used, and will be often found even in this book, the industry now prefers to call its product metal building systems.
Advantages of Pre-engineered steel
Most metal buildings are purchased by the private sector, which seems to appreciate the advantages of proprietary pre-engineered buildings more readily than the public entities. Ability to span long distances. There are not many other types of gabled structures than can span 100 ft or more in a cost-effective manner. The competition consists mainly of trusses, which require substantial design and fabricating time. (Special tensioned fabrics could also span the distance but are in a class by themselves.)
Faster occupancy. Anyone who has ever tried to assemble a piece of furniture can remember the frustration and the amount of time it took to comprehend the various components and the methodology of assembly. The second time around, the process goes much faster. A similar situation occurs at a construction site when a stick-built structure is being erected. The first time it takes a little longer…, but there is no second time to take advantage of the learning curve. With standard pre-engineered components, however, an experienced Erector is always on familiar ground and is very efficient.
Cost efficiency. In a true systems approach, well-fitting pre-engineered components are assembled by one or only a few construction trades; faster erection means less-expensive field labor. In addition, each structural member is designed for near-total efficiency, minimizing waste of material. Less labor and less material translate into lower cost. The estimates of this cost efficiency very, but it is commonly assumed that pre-engineered buildings are 10 to 20 percent less expensive than conventional ones. However, as is demonstrated in Chap. 3, some carefully designed stick built structures can successfully compete with metal building systems.
Flexibility of Expansion Metal buildings is relatively easy to expand by lengthening, which involves
disassembling bolted connections in the end wall, removing the wall, and installing an additional clear spanning frame in its place. The removed end wall framing can often be reused in the new location. Matching roof and wall panels are then added to complete the expanded building envelope.
Low maintenance. A typical metal building system, with pre-finished metal panels and standing seam roof, is easy to maintain: metal surfaces are easy to clean, and the modern metal finishes offer a superb resistance against corrosion, fading, and discoloration Single-source responsibility. The fact that a single party is responsible for the entire building envelope is among the main benefits of metal building systems.
Why Pre-Engineered Buildings ?
Choosing steel to design a Pre-engineered steel structures building is to choose a material which offers low-cost, strength, durability, design flexibility, adaptability, and recyclability. Steel is the basic material that is used in the Materials that are used for Pre-Engineered steel building. It negates from regional sources. It also means choosing reliable industrial products which come in a huge range of shapes and colors; it means rapid site installation and less energy consumption. It means choosing to commit to the principles of sustainability. Infinitely recyclable, steel is the material that reflects the imperatives of sustainable development.