Pre-engineered building – PEB: Pre Engineered Building is a metal building enclosure system that always includes a structural system and often includes roof and wall cladding and is designed and fabricated in the factory premises. PEB or Pre Engineered Building was firstly originated in the United State and later on was introduced in India by Middle Eastern vendors. The main reason for adopting PEB in India is the persisting trust in traditional construction methods. PEB is basically designed by a PEB supplier or PEB manufacturer, to be fabricated using best suited inventory of raw materials available from all sources and manufacturing methods that can efficiently satisfy a wide range of structural and aesthetic design requirements. Historically, the primary framing structure of a pre-engineered building is an assembly of I-shaped members, often referred to as I-beams. In pre-engineered buildings, I beams used are usually formed by welding together steel plates to form the I section. I beams are then field-assembled (e.g. bolted connections) to form the entire frame of the pre-engineered building. Larger plate dimensions are used in areas of higher load effects. Pre-engineered buildings can be adapted to suit a wide variety of structural applications. An efficiently designed pre-engineered building can be lighter than the conventional steel buildings by up to 30%.
PEB STRUCTURE COMPONENTS:
- Primary Frame.
- Secondary Structural Elements.
- Roof and Wall Panels.
- Sandwich Panels.
- Other accessories.
Primary Frame- Pre-Engineered steel building is portal frame construction comprises of primary and secondary framing and bracing system. A combination of these three elements and weather covering sheeting results in stable steel buildings instead of individual frame. In case of conventional structure, individual column and truss are separately designed and free standing frames resulting bulky and heavy structure.
COLUMN–RAFTER CONNECTION: Functional need of the framing system, column to rafter connection can be design in various ways. In each option of rafter-column design, there are different merits and demerits as steel consumption also keep on varying in each option. Therefore it is necessary for designer to opt. for economical connection unless some functional constraints are there.
Secondary Structural Elements: Secondary framing system is mainly purlin and girt of Z or C shapes of various sizes. In Pre-Engineered buildings normally cold form Z sections are used for secondary framing to achieve high strength and lower weight. Typically cold form members used for roof are called purlin and for wall it is called as girt. Sometime C section is also used in place of Z. Purlin/Girts are the members which transfers forces and moments from one frame to another frame for overall stability of the building structure and it all acts as framing system for weather covering sheeting purpose.
Roof and Wall Panels: Tin shades & Curtain Wall made of Glass & Roll-formed steel sheets usually comes in this category. For transfer of wind force and other acting loads form building frame to the foundation at certain interval x-bracing system is used to change the direction of forces for reducing the impact of forces. 2nd and 2nd last bays are preferably designed as braced bay and in between every 4th bay shall be braced bay for economical reason. These braced bays are for roof as well as wall between two frames (bay). Normally rod, pipes or angles are used for x-bracing purpose. In wall bracings are laid between two columns form haunch to bottom of columns.
Sandwich Panels: Sandwich Panel is made of three layers, in which a non-Aluminum Core is inserted b/w two aluminum sheet.
Other accessories: Mezzanine floors, Bolts, Insulation, etc.
PEB STRUCTURE MANUFACTURER:
It’s the structural system that determines the speed and flexibility of the pre-engineered steel/metal buildings. The beams and columns having an end plate with holes for attaching at both ends are custom fabricated I-section members. Their making includes steel plates that are cut as per desired thickness and then welded together to make I sections. The speed and consistency in fabrication enhances to a great deal.
A crane is used to lift the painted steel sections, and they are then attached together by construction workers who climb to the suitable position. In the construction of huge buildings, we make use of two cranes that work from both ends. Things that make PEB Invaluable are the competitively priced, quality assurance, easy future expansion, low maintenance cost, fastest delivery time erection, ability to withstand seismic forces etc.
PEB Structure Design
PEB design is rapid and efficient compared CSB design. Basic design steps are followed and optimization of materials while software analysis is possible for PEB, increasing the quality of design, in passing. CSB design is done with fewer design aids and each project needs to develop the designs which require more time, as in. Connection design is also lesser for PEB when measured up to CSB.
Some designs are:
Pre Engineered Building Design:
Pre-Engineered Building concept involves the steel building systems which are predesigned and prefabricated. This concept involves pre-engineering of structural elements using a predetermined registry of building materials and manufacturing techniques that can be proficiently complied with a wide range of structural and aesthetic design requirements. The basis of the PEB concept lies in providing the section at a location only according to the requirement at that spot. The sections can be varying throughout the length according to the bending moment diagram. This leads to the utilization of non-prismatic rigid frames with slender elements. Tapered I sections made with built-up thin plates are used to achieve this configuration. Standard hot-rolled sections, cold-formed sections, profiled roofing sheets, etc. is also used along with the tapered sections.
Conventional Steel Buildings Design
Conventional steel buildings (CSB) are low rise steel structures with roofing systems of truss with roof coverings. Various types of roof trusses can be used for these structures depending upon the pitch of the truss. For large pitch, Fink type truss can be used; for medium pitch, Pratt type truss can be used and for small pitch, Howe type truss can be used. Skylight can be provided for day lighting and for more day lighting, North light type truss can be used. The selection criterion of roof truss also includes the slope of the roof, fabrication and transportation methods, aesthetics, climatic conditions, etc. Several compound and combination type of economical roof trusses can also be selected depending upon the utility. Standard hot-rolled sections are usually used for the truss elements along with gusset plates, in passing
2. Industrial Sheds
3. Factory Sheds
5. Truss Shed
6. Pavilions Shed
7. Pre Engineered Building
8. Pre Fabricated Building